A valve actuator

A valve actuator a) cannot be reverse acting b) will always have one side of the diaphragm open to atmosphere c) is a two-position device d) position...

When a recorder receives a signal from a transmitter, the recorder incorporates a

When a recorder receives a signal from a transmitter, the recorder incorporates a a) signal reverser b) pneumatic relay c) flapper-nozzle assembly d)...

A proportional only controller

A proportional only controller a) cannot maintain maximum value of the final element b) cannot maintain set point except at 50% c) can be compared...

The output pressure signal of a transmitter relay is usually

The output pressure signal of a transmitter relay is usually a) direct and proportional to nozzle pressure b) a function of supply pressure c) inversely...

A flapper-nozzle assembly is basic to all

A flapper-nozzle assembly is basic to all a) controllers b) transmitters c) recorders d) pneumatic devices e) actuators Answer:...

On a basic pneumatic transmitter, a movement of the flapper towards nozzle will:

On a basic pneumatic transmitter, a movement of the flapper towards nozzle will: a. Increase the nozzle bleed. b. Change the size of the supply orifice. c....

Putting a controller on manual control means:

Putting a controller on manual control means:  a. The operator controls the final control element. b. The controller output responds to a process...

A valve which gives good throttling action, takes less actuator force, but does not seal well is a:

A valve which gives good throttling action, takes less actuator force, but does not seal well is a: a. Double seated valve b. Reverse acting valve c....

A proportional-only controller:

A proportional-only controller: a. Are mostly used for on/off control. b. Compare actual conditions to controller outputs. c. Must provide reset...

Most solenoid valves operate so that the upstream line pressure will:

Most solenoid valves operate so that the upstream line pressure will: a. Act to open the valve b. Be less than downstream pressure c. Be sensed by...

Cascade control utilizes:

Cascade control utilizes: a. One controller, one transmitter and two valves. b. One controller, two transmitters and two valves c. Two controllers,...

A circular chart recorder:

A circular chart recorder: a. Provides a different function than a strip chart. b. Is newer design than a strip chart. c. May incorporate a bourdon...

A sensing element sends its signal to

A sensing element sends its signal to a. a Transmitter b. an air line c. a Conveyer d. a Flapper and nozzle e. a Recorder Answer:...

A CRT or LCD display trend recorder

A CRT or LCD display trend recorder a. Often has a number of dedicated displays b. Is equipped with graph limiters c. Does not have print out capabilities d....

A CRT trend display:

A CRT trend display: a. Mimics a trend chart. b. Is dedicated to a single process. c. Is limited to displaying a fixed or nonadjustable time period. d....

A pneumatically actuated control valve which opens on air failure has a:

A pneumatically actuated control valve which opens on air failure has a: a. Direct acting actuator and direct acting valve. b. Direct acting actuator...

A recorder utilizing a spiral Bourdon tube will have a pen movement:

A recorder utilizing a spiral Bourdon tube will have a pen movement: a. On a logarithmic scale b. Proportional to the change in tube pressure c....

Normally-closed solenoid operated valves open when

Normally-closed solenoid operated valves open when a. a coil is electrically energized b. pressure below the valve disc overcomes the spring pressure...

In a pneumatic control system, the nozzle receives a regulated air supply pressure of approximately:

In a pneumatic control system, the nozzle receives a regulated air supply pressure of approximately: a. 140 psi b. 20 kPa c. 140 kPa d. 210 kPa e....

A control valve that has one plug that moves upward to close the port is called:

A control valve that has one plug that moves upward to close the port is called: a. Reverse acting single ported. b. Double seated direct acting. c....

A two-position controller compares conditions to a set point and:

A two-position controller compares conditions to a set point and: a. Starts or stops a process b. A controller output signal c. Modulates the final...

Integral and Derivative functions

Integral and Derivative functions a. may be combined with multi-position controllers b. are also called feed-forward and cascade functions c. Help...

When controller output is proportional to the amount of deviation, the controller is:

When controller output is proportional to the amount of deviation, the controller is: a. Derivative only b. Integral c. Two-position d. Proportion...

A valve body that seals on the down stroke is:

A valve body that seals on the down stroke is: a. Reverse acting b. Single sealed c. Direct acting d. Double sealed e. Unidirectional Answer:...

A proportional controller:

A proportional controller: a. Is also called a multi-position controller b. Provides a proportional output based on the error between process variable...

Control valves

Control valves a. Must fail closed b. Provide variable resistance in a piping system c. Provide tight flow shut-off d. Must modulate from fully open...

The electrical output from a thermocouple is measured by a

The electrical output from a thermocouple is measured by a a) milliamp meter b) wattmeter c) milliwatt meter d) millivoltmeter e) power meter Answer:...

Relative to flow, velocity is kinetic energy and when velocity increases, the

Relative to flow, velocity is kinetic energy and when velocity increases, the a) pressure and potential energy, will also increase b) cross-sectional...

When a float is used for measuring level, and installation within a vessel is impractical, a device often used is the

When a float is used for measuring level, and installation within a vessel is impractical, a device often used is the a) float manometer b) float...

A bimetal thermostat reacts to changes of

A bimetal thermostat reacts to changes of a) pressure b) flow c) humidity d) heat e) temperature Answer:...

One of the most widely used process variables in a system is

One of the most widely used process variables in a system is a) temperature b) pressure c) density d) purity e) flow Answer:...

When a diaphragm device is used for boiler water level measurement, the boiler pressure is compensated for or off-set by

When a diaphragm device is used for boiler water level measurement, the boiler pressure is compensated for or off-set by a) using a bellows on the...

A Bourdon tube is often in the shape of a spiral so that

A Bourdon tube is often in the shape of a spiral so that a) its final output has less travel b) gears can be used for final output c) higher pressures...

The variable area meter consists of:

The variable area meter consists of: a. A fluid being measured, flowing through the tube from the top to the bottom b. A float across which the differential...

The Bourdon tube can be used with a bulb and capillary tube to measure:

The Bourdon tube can be used with a bulb and capillary tube to measure: a. Viscosity b. Water head c. Flow d. Humidity e. Temperature Answer:...

A thermocouple will produce a signal which:

A thermocouple will produce a signal which: a. Will be read on a pressure scale b. Will be fully proportional to a temperature difference c. Increases...

In an area flow meter, the flow is measured at:

In an area flow meter, the flow is measured at: a. The bottom of the float b. The top of the float c. The edge of the float head d. The outlet connection e....

Thermocouples require:

Thermocouples require: a. A bi-metallic strip or coil b. A thermopile c. Two dissimilar metals d. An elliptical sectioned tube e. A heating element Answer:...

The constant head connection in a remote water level indicator is made to the:

The constant head connection in a remote water level indicator is made to the: a. Feed water pump discharge b. Water space c. Atmosphere d. Feed...

Glass thermometers with a mercury fill, are sometimes pressurized with nitrogen so:

Glass thermometers with a mercury fill, are sometimes pressurized with nitrogen so: a. They can be installed in any position b. They can be used at...

A thermocouple measures:

A thermocouple measures: a. Pressure b. Temperature c. Flow d. Velocity e. Light Answer:...

A chromatograph uses electronic devices which:

A chromatograph uses electronic devices which: a. Utilize electrical current as a measurement base b. Have inverse resistance properties relative...

An orifice plate with a round opening that is centred in the middle of the plate is called a:

An orifice plate with a round opening that is centred in the middle of the plate is called a: a. Segmental orifice b. Concentric orifice c. Eccentric...

The unit kg/m³ describes a material's

The unit kg/m³ describes a material's a. Specific Gravity b. Pressure c. Density d. Flexibility e. Displacement Answer: C ...

The inclined "U" tube manometer:

The inclined "U" tube manometer: a. Will measure pressure in MPa b. Can only be used with mercury c. Is more accurate than the "U" tube manometer d....

The Bourdon tube is often shaped in the form of a "C", having an arc span of about:

The Bourdon tube is often shaped in the form of a "C", having an arc span of about: a. 180 degrees b. 360 degrees c. 200 degrees d. 90 degrees e....

The advantage of using a venturi tube, rather than an orifice plate for flow measurement is it:

The advantage of using a venturi tube, rather than an orifice plate for flow measurement is it: a. Produces less permanent pressure drop b. Costs...

Liquids must be vapourized

Liquids must be vapourized a. In order to measure density b. If purity is to be measured c. When a chromatograph is being used d. When conductivity...

Low pressures and vacuums may be measured:

Low pressures and vacuums may be measured: a. With a transducer b. With a rotameter c. In MPa d. With a manometer e. In milli-Newtons Answer:...

In a glass stem thermometer the space above the liquid is usually:

In a glass stem thermometer the space above the liquid is usually: a. Filled with Nitrogen b. Filled with Argon c. Under a vacuum d. Open to atmosphere e....

An inclined manometer is commonly used:

An inclined manometer is commonly used: a. When very low pressures or vacuums are being used: b. To measure high pressure differentials c. In conjunction...

A thermocouple consists of:

A thermocouple consists of: a. A filament that is compared to the object being measured b. Two dissimilar wires connected together to form a hot and...

Which one is NOT an disadvantage of Pneumatic Signals?

Which one is NOT an disadvantage of Pneumatic Signals? a. Always lag or delay in the signal b. Friction causes a decrease in the value of the signal c....

Which one is NOT an advantage of Pneumatic Signals?

Which one is NOT an advantage of Pneumatic Signals? a. They are simple and provide trouble free operation b. They can transmit over long distances c....

The component of a control system that adjusts the value of the manipulated variable

The component of a control system that adjusts the value of the manipulated variable a. Process variable b. Final control element c. Manipulated variable d....

Indicates the value of the variable (pressure, level, or flow) being monitored or recorded on a chart for future reference.

Indicates the value of the variable (pressure, level, or flow) being monitored or recorded on a chart for future reference. a. Transmitter b. Controller c....

Instantly show the values of different variables to the operators and maintenance personnel.

Instantly show the values of different variables to the operators and maintenance personnel. a. Transmitter b. Controller c. Indicator d. Recorder e....

The margin by which an automatic controller misses the desired value

The margin by which an automatic controller misses the desired value a. Agitation b. Disruption c. Disturbance d. Error e. Malfunction Answer:...

When a process variable has no method of sending information to the final control element the system is known as

When a process variable has no method of sending information to the final control element the system is known as a) an automatic system b) an open...

An upset in a plant process is called a/an:

An upset in a plant process is called a/an: a. Agitation b. Disruption c. Disturbance d. Error e. Malfunction Answer: ...

Pneumatic signals operate between:

Pneumatic signals operate between: a. 20 and 200 kPa b. 0 and 100 kPa c. 50 and 500 kPa d. 20 and 100 kPa e. 20 and 200 kPa Answer:...

A controller is a device that primarily:

A controller is a device that primarily: a. Sends or transmits a positive rather than negative signal b. Tries to maintain a set point c. Records...

Automatic systems that can make decisions are termed:

Automatic systems that can make decisions are termed: a. Annunciation systems b. Indicating systems c. Logic systems d. Open loop systems e. Go-NoGo...

In an automatic control system, the controller output signal changes the position of the:

In an automatic control system, the controller output signal changes the position of the: a. Recorder b. Transmitter c. Sensing element d. Control...

For a pneumatic control system, it is imperative that

For a pneumatic control system, it is imperative that a. The maximum transmitter output signal pressure be maintained b. The air supply is kept clean...

A device which will cause a visible light signal to become an instrument analog signal is the:

A device which will cause a visible light signal to become an instrument analog signal is the: a. Photoelectric transducer b. Transferor c. Controller d....

An open loop control system requires:

An open loop control system requires: a. A transducer and a recorder b. More accurate sensing devices c. A very small amount of dead time or lag d....

Level, pressure, flow, temperature, composition, vibration, speed and clearance are all examples of:

Level, pressure, flow, temperature, composition, vibration, speed and clearance are all examples of: a. Transmitters b. Process variables c. Sensing...

A control loop controller:

A control loop controller: a. Operates without a set point b. Sends a signal to a primary element c. Measures the manipulated variable value, eliminating...

The forms commonly used for power-plant equipment control include analog, digital, mechanical, pneumatic and:

The forms commonly used for power-plant equipment control include analog, digital, mechanical, pneumatic and: a. Physical b. Electrical c. Manual d....

Some of the components of an automatic control loop are a sensing element, a transmitter, a _____ and a control valve.

Some of the components of an automatic control loop are a sensing element, a transmitter, a _____ and a control valve. a. Controller b. Transformer c....

A sensing element sends its signal to a:

A sensing element sends its signal to a: a. Transmitter b. Controller c. Control valve d. Recorder e. Process variable Answer: ...

A fire eye or flame scanner keeps the burner circuit energized as long as the burner flame is maintained. This is accomplished using a:

A fire eye or flame scanner keeps the burner circuit energized as long as the burner flame is maintained. This is accomplished using a: a. Control...

A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the:

A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the: a. Process variable b....

A sensing element responds to the value of the

A sensing element responds to the value of the a. Controller b. Recorder c. Control valve d. Transducer e. Controlled variable Answer:...

The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a:

The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a: a. Converter b. Inducer c. Inverter d. Transducer e....

An automatic transfer switch will switch over when the voltage falls below __% of rated and will return automatically upon a resumption of service.

An automatic transfer switch will switch over when the voltage falls below __% of rated and will return automatically upon a resumption of service. a....

___ are used to select alternate circuits

___ are used to select alternate circuits a. Switchboards b. Feeders c. Branch circuits d. Transfer Switches e. Tertiary circuits Answer:...

The branch circuit amperage capacity may range from __ to __ Amperes?

The branch circuit amperage capacity may range from __ to __ Amperes? a. 5 to 300 b. 8 to 450 c. 10 to 600 d. 15 to 700 e. 20 to 800 Answer:...

Circuits which extend beyond the final overcurrent device are termed?

Circuits which extend beyond the final overcurrent device are termed? a. Secondary circuits b. Primary circuits c. Branch circuits d. Trunk circuits e....

Beyond the first protective device the __ form the distribution network to the last protective devices which protect the branch circuits.

Beyond the first protective device the __ form the distribution network to the last protective devices which protect the branch circuits. a. Switchboards b....

___ provides an enclosure for the distribution and control of the feeders as well as switching and protection of the service.

___ provides an enclosure for the distribution and control of the feeders as well as switching and protection of the service. a. Transformer cabinets b....

Which diagram illustrate the locations and markings of each terminal and the interconnection that is required?

Which diagram illustrate the locations and markings of each terminal and the interconnection that is required? a. Riser diagram b. One-line diagram c....

Which diagram indicates by means of single lines and simplified symbols the distribution of electrical systems in a multistoried structure?

Which diagram indicates by means of single lines and simplified symbols the distribution of electrical systems in a multistoried structure? a. Riser...

Which diagram displays the relative physical arrangement of components, including all wiring and connections?

Which diagram displays the relative physical arrangement of components, including all wiring and connections? a. Riser diagram b. One-line diagram c....

The actual ratings on devices selected for nominal system supplies are about __ lower, to account for any voltage drop of the supply system.

The actual ratings on devices selected for nominal system supplies are about __ lower, to account for any voltage drop of the supply system. a. 1% b....

A 120 V system is best described as a:

A 120 V system is best described as a: a. Three phase four-wire system b. One phase three-wire system c. Three phase three-wire system d. One phase...

A 120/240 V system is best described as a:

A 120/240 V system is best described as a: a. Three phase four-wire system b. One phase three-wire system c. Three phase three-wire system d. One...

The utility's responsibility will not go beyond the

The utility's responsibility will not go beyond the a) first branch line b) first overcurrent device c) primary transformer d) first trunk circuit e)...

A prime factor in determining the voltage to be used in a circuit is

A prime factor in determining the voltage to be used in a circuit is a) transformer capacity b) peak demands c) degree of access to equipment d)...

Choose the statement that is FALSE. In an electrical system the neutral wire:

Choose the statement that is FALSE. In an electrical system the neutral wire: a. Is connected to earth at one or more points b. Is not attached to...

Low voltage systems may have an actual voltage variation of plus or minus:

Low voltage systems may have an actual voltage variation of plus or minus: a. 10% b. 5% c. 1.5% d. 7.5% e. 12.5% Answer:...

An electrical distribution system is composed of service, feeders and:

An electrical distribution system is composed of service, feeders and: a. Secondary circuits b. Primary circuits c. Branch circuits d. Trunk circuits e....

Low voltages include all voltages between _____ V.

Low voltages include all voltages between _____ V. a. 0 and 30 b. 30 and 110 c. 30 and 220 d. 30 and 750 e. 100 and 750 Answer:...

Extra low voltages include all voltages below _____ V.

Extra low voltages include all voltages below _____ V. a. 30 b. 50 c. 110 d. 220 e. 440 Answer:...

When working with high voltage systems, the minimum distance of approach should be not less than:

When working with high voltage systems, the minimum distance of approach should be not less than: a. 1 m b. 5 m c. 2 m d. 3 m e. 0.5 m Answer:...

The best type of diagram for showing supply and distribution system is the _____ diagram.

The best type of diagram for showing supply and distribution system is the _____ diagram. a. Riser b. One-line c. Elementary d. Connection e. Terminal...

Tie breakers are used to:

Tie breakers are used to: a. Allow the interconnection of two power sources without placing them in parallel b. Break the circuit in case of overload c....

The ability of an electrical circuit to store a charge of electricity even after the circuit is opened is termed:

The ability of an electrical circuit to store a charge of electricity even after the circuit is opened is termed: a. Hysteresis b. Grounding c. Inductance d....

High voltages include all voltages above _____ V.

High voltages include all voltages above _____ V. a. 220 b. 750 c. 1000 d. 15,000 e. 72,000 Answer: ...

A 120/208 V system is best described as a:

A 120/208 V system is best described as a: a. Three phase four-wire system b. SIngle phase one-wire system c. Three phase three-wire system d. One...

The electrical schematic or elementary diagram shows:

The electrical schematic or elementary diagram shows: a. The relative physical arrangement of components including all wiring and connections b....

When working with high voltages the following precautions should be observed:

When working with high voltages the following precautions should be observed: a. Access should be locked, allowing only authorized personnel to enter b....

A typical extra low voltage device would be a:

A typical extra low voltage device would be a: a. Toaster b. Fluorescent light c. Door bell d. Step-down transformer e. Television set Answer:...

Apparent power is the power

Apparent power is the power a) used for the actual work b) generated by rotating equipment c) supplied by the utility d) caused by system capacitance e)...

To transfer the power to or from the rotor of alternators or some AC motors

To transfer the power to or from the rotor of alternators or some AC motors a) field poles are employed b) rheostats are used c) a commutator is...

Brush gear for DC machines have brushes made from carbon because they:

Brush gear for DC machines have brushes made from carbon because they: 1. are softer 2. wear to a smooth finish 3. are low cost 4. can produce large...

Synchronous motors have construction that is identical to

Synchronous motors have construction that is identical to a) reciprocating equipment b) gas turbines c) air driven motors d) centrifugal fans e)...

The yoke that supports the main components of the DC machine is frequently made of

The yoke that supports the main components of the DC machine is frequently made of a) copper or brass b) mica and carbon c) copper and carbon d)...

Shunt wound DC motors are common where speed must remain constant regardless of load such as on

Shunt wound DC motors are common where speed must remain constant regardless of load such as on a) automobile starters b) machinist lathes c) portable...

______ are used on motors and generators to set up a magnetic field.

______ are used on motors and generators to set up a magnetic field. a) Insulated wires b) Transformers c) Carbon rings d) Mica strips e) Field poles Answer:...

A 6 pole alternator producing 60 Hz power must turn at

A 6 pole alternator producing 60 Hz power must turn at a) 1800 rpm b) 2400 rpm c) 1000 rpm d) 1200 rpm e) 600 rpm Answer:...

The stator of an alternator is built of ______ mounted in a frame.

The stator of an alternator is built of ______ mounted in a frame. a) copper alloys b) silicon steel c) carbon ring d) asbestos impregnated silver e)...

The rotating field of an alternator is obtained by exciting the windings on the rotor with

The rotating field of an alternator is obtained by exciting the windings on the rotor with a) AC power b) stator current c) magnetic particles d)...

A compound wound DC generator may have three characteristics which are a: 1. decreasing output voltage versus load 2. no amperage requirement 3. constant output voltage 4. supplementary AC requirement 5. rising output voltage versus load

A compound wound DC generator may have three characteristics which are a:1. decreasing output voltage versus load2. no amperage requirement3. constant...

The field rheostat changes the ______ in a DC generator.

The field rheostat changes the ______ in a DC generator. a) output voltage b) input voltage c) output current d) input resistance e) horse power Answer:...

The commutator of a DC machine is made of copper bars mounted in

The commutator of a DC machine is made of copper bars mounted in a) glass b) micanite c) steel plates d) fibre-glass e) carbon rings Answer:...

The field rheostat in a DC generator is used to adjust the ______ of the motor.

The field rheostat in a DC generator is used to adjust the ______ of the motor. a) direction of rotation b) current c) output voltage d) torque e)...

When synchronizing an alternator; voltage, phase and frequency must all be the same as well as

When synchronizing an alternator; voltage, phase and frequency must all be the same as well as a) phase sequence b) speed c) current d) power e)...

A rheostat or "voltage regulator" of a DC shunt wound generator is used to

A rheostat or "voltage regulator" of a DC shunt wound generator is used to a) regulate the strength of the electromagnetic field b) regulate the speed...

A common use for a DC generator is

A common use for a DC generator is a) power supply for an elevator b) an automobile alternator c) power supply for a machinist lathe d) power factor...

The space around a magnet, through which the imaginary magnetic lines of force are considered to travel, is known as the

The space around a magnet, through which the imaginary magnetic lines of force are considered to travel, is known as the a) flux field b) clearance...

The connection provided on DC motors to supply the armature with power

The connection provided on DC motors to supply the armature with power a) are slip rings b) are field poles c) is a rheostat d) is a commutator e)...

The field strength of an alternator may be changed by varying the amplitude of the DC power, supplied to the rotating field by:

The field strength of an alternator may be changed by varying the amplitude of the DC power, supplied to the rotating field by: 1. the use of a field...

Three factors which control the electromotive force developed by a DC generator are the:

Three factors which control the electromotive force developed by a DC generator are the: 1. size of the frame 2. speed with which conductors cut the...

The three main types of DC generators are the: 1. compound wound 2. parallel wound 3. series wound 4. reverse wound 5. shunt wound

The three main types of DC generators are the:1. compound wound2. parallel wound3. series wound4. reverse wound5. shunt wound a) 1, 3, 5 b) 1, 2,...

The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC machines use field poles that are essentially

The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC machines use field poles that are essentially a)...

The armature core of a DC machine is built up of laminations of

The armature core of a DC machine is built up of laminations of a) copper bars b) mica sheets c) reinforced carbon plates d) electromagnets e) silicon...

In order to produce the strength of magnetic flux required in larger DC machines

In order to produce the strength of magnetic flux required in larger DC machines a) electromagnets are used b) copper switches are used c) permanent...

The main components of a DC machine are the yoke or frame which supports the _____ and the rotor which is called an armature.

The main components of a DC machine are the yoke or frame which supports the _____ and the rotor which is called an armature. a) wiring b) field poles c)...

The output voltage of a shunt dc generator may be varied by adjusting the

The output voltage of a shunt dc generator may be varied by adjusting the a) field rheostat b) brakes c) output current d) number of poles e) main...

Alternators must run at constant speed in order to maintain

Alternators must run at constant speed in order to maintain a) current b) power c) voltage d) resistance e) frequency Answer:...

The electromagnetic field for a DC machine is termed the

The electromagnetic field for a DC machine is termed the a) armature b) yoke c) field poles d) brush gear e) commutator Answer:...

A class A motor is allowed to ruin with temperature rise of ___ C when ambient temperature is considered to be 40C.

A class A motor is allowed to ruin with temperature rise of ___ C when ambient temperature is considered to be 40C. a. 20C b. 40 to 50 C c. 70 to...

A class B motor is allowed to ruin with temperature rise of ___ C when ambient temperature is considered to be 40C.

A class B motor is allowed to ruin with temperature rise of ___ C when ambient temperature is considered to be 40C. a. 20C b. 40 to 50 C c. 70 to...

The speed of the rotor in a synchronous motor runs at:

The speed of the rotor in a synchronous motor runs at: a. A speed slower than that of the field speed of the motor b. The same speed as the field...

The speed of the rotor in an induction motor runs at:

The speed of the rotor in an induction motor runs at: a. A speed slower than that of the field speed of the motor b. The same speed as the field speed...

The field strength of an alternator can be adjusted by varying the amplitude of the DC power supply to the:

The field strength of an alternator can be adjusted by varying the amplitude of the DC power supply to the: a. Rotating field b. Stator windings c....

The coils or windings on a DC machine armature are placed in _____ the face of the armature.

The coils or windings on a DC machine armature are placed in _____ the face of the armature. a. Bars, located on b. Holes, located on c. Conduits,...

A shunt type DC generator produces _____ voltage:

A shunt type DC generator produces _____ voltage: a. Very high. b. Nearly constant. c. Very low. d. Erratic. e. Alternating. Answer:...

Apparent power is the

Apparent power is the a. kW of power consumed b. Generated by DC generators c. VA supplied to the circuit d. Power due to resistance in a circuit e....

The main components of a DC machine are the yoke or frame that supports the _____ and the rotor, which is called an armature.

The main components of a DC machine are the yoke or frame that supports the _____ and the rotor, which is called an armature. a. Wiring b. Field...

Synchronous motors are desirable because they can

Synchronous motors are desirable because they can a. Start alternators b. Lower the power factor of a system c. Replace variable-speed DC motors d....

Which of the following does NOT affect the electromotive force developed by a DC generator?

Which of the following does NOT affect the electromotive force developed by a DC generator? a. Speed with which conductors cut the magnetic lines...

Permanent magnets are used for:

Permanent magnets are used for: a. Wound-rotor induction motors b. Shunt motors c. Series motors d. Small portable alternators and generators e....

The three main types of DC generators

The three main types of DC generators a. Are all separately excited b. Develop constant voltage regardless of load c. Are excited by load current d....

A rheostat is also known as

A rheostat is also known as a. a voltage regulator b. an automatic resistor c. a current controller d. a variable resistor e. an exciter Answer:...

Alternators are constructed to use slip rings made of brass or:

Alternators are constructed to use slip rings made of brass or: a. Copper b. Carbon c. Mica d. Silicon e. Steel Answer:...

Brush gear for DC machines have brushes made from carbon because

Brush gear for DC machines have brushes made from carbon because  a. carbon is a good insulator b. carbon doesn't heat up c. carbon reduces the...

Which of the following is NOT a requirement for synchronizing alternators?

Which of the following is NOT a requirement for synchronizing alternators? a. Amperages must be equal b. Voltages must be in-phase c. Phase rotations...

The _____ of a DC machine is built up of laminated steel plates mounted on a shaft. The coils are connected to a commutator mounted on one end of the rotor shaft.

The _____ of a DC machine is built up of laminated steel plates mounted on a shaft. The coils are connected to a commutator mounted on one end of the...

The stator of an alternator is built of _____ mounted in a frame.

The stator of an alternator is built of _____ mounted in a frame. a. Copper alloys b. Silicon steel c. Carbon ring d. Armature conductors e. Non-metallic...

_______ are used on motors and generators to produce the strong magnetic field required by these machines.

_______ are used on motors and generators to produce the strong magnetic field required by these machines. a. Insulated wires b. Transformers c. Solenoids d....

Which transformer is used to trap the harmonics on the primary windings?

Which transformer is used to trap the harmonics on the primary windings? a) k-type transformer b) core type transformer c) potential transformer d)...

Double-wound transformers can be connected as?

Double-wound transformers can be connected as? a) current transformer b) core type transformer c) potential transformer d) shell type transformer e)...

Iron loses in a transformer are caused by?

Iron loses in a transformer are caused by? a. Eddy currents b. Magnetic hysteresis c. Harmonic distortion d. All of the above e. A and B Answer:...

All of the primary and secondary is wound on the centre leg. This transformer is called?

All of the primary and secondary is wound on the centre leg. This transformer is called? a) current transformer b) core type transformer c) potential...

Primary and secondary windings are split into two equal parts, with one half of the primary and one half of the secondary wound on each of the two "legs" of the transformer. This transformer is called?

Primary and secondary windings are split into two equal parts, with one half of the primary and one half of the secondary wound on each of the two "legs"...

If the secondary voltage is smaller than primary voltage in a transformer. This transformer is called?

If the secondary voltage is smaller than primary voltage in a transformer. This transformer is called? a) current transformer b) step down transformer c)...

If the number of secondary turns is greater than the number of primary turns in a transformer. This transformer is called?

If the number of secondary turns is greater than the number of primary turns in a transformer. This transformer is called? a) current transformer b)...

In a dc circuit, self-inductance is __ when voltage is at maximum, while in a ac circuit self inductance is __

In a dc circuit, self-inductance is __ when voltage is at maximum, while in a ac circuit self inductance is __ a. Not a factor, continually a factor b....

When relative movement ceases, production of induced E ceases. This process is called

When relative movement ceases, production of induced E ceases. This process is called  a. Harmonic distortion b. Self inductance c. Mutual inductance d....

The size of the conductor is __ to the size of the current.

The size of the conductor is __ to the size of the current. a. Inversely proportional b. Proportional c. Equal d. None of the above Answer:...

Transformer cooling oil has

Transformer cooling oil has a) a very high specific heat b) a poorer insulating characteristic than air c) a very high fire point d) no factors which...

Current transformers step down the current rather than the

Current transformers step down the current rather than the a) resistance b) flux strength c) conductance d) number of poles e) voltage Answer:...

The capacity of a transformer can be increased by: 1. submerging the core and windings in a tank of oil 2. submerging the core and windings in a tank of water 3. forced air cooling the oil in a heat exchanger 4. wrapping the core with a thermal insulation 5. forced air cooling of the core

The capacity of a transformer can be increased by:1. submerging the core and windings in a tank of oil2. submerging the core and windings in a tank...

Transformers are rated in terms of: 1. Volt amperes 2. Kilowatts 3. Kilovolt amperes 4. Ohms

Transformers are rated in terms of:1. Volt amperes2. Kilowatts3. Kilovolt amperes4. Ohms a) 1, 2 b) 2, 4 c) 2, 3 d) 3, 4 e) 1, 3 Answer:...

A device used to change the voltage and current from one level to another, is known as a/an

A device used to change the voltage and current from one level to another, is known as a/an a) conductor b) resistor c) alternator d) transformer e)...

Copper losses in a transformer are reduced by

Copper losses in a transformer are reduced by a) using fan cooling b) using oil cooling c) using larger diameter wire d) reducing the primary voltage e)...

A transformer works on the principle of

A transformer works on the principle of a) reverse polarity b) magnetic induction c) DC power flowing in one direction d) straight polarity e) automatic...

Transformers require:

Transformers require: a. More maintenance than other electric machinery b. Less maintenance than most other electric machinery c. No maintenance d....

The voltage induced in the secondary windings of the transformer, is _____ the turns ratio of the transformer.

The voltage induced in the secondary windings of the transformer, is _____ the turns ratio of the transformer. a. Directly proportional to b. Reversed...

A phenomenon produced by electric switchgear that can result in excessively high voltages in transformers is known as:

A phenomenon produced by electric switchgear that can result in excessively high voltages in transformers is known as: a. Capacitive reactance b....

Auto-transformers:

Auto-transformers: a. Can use less copper b. Use more copper c. Have large ratios of transformation d. Use separate windings for primary and secondary...

When AC action causes a counter current in a coil of wire, it is termed:

When AC action causes a counter current in a coil of wire, it is termed: a. Self inductance b. Capacitance c. Hysteresis d. Mutual inductance e....

Single-phase transformers:

Single-phase transformers: a. Use two common forms of construction known as the core type and the shell type. b. High voltage coil is nearest the...

An instrument transformer used to measure voltage is called a:

An instrument transformer used to measure voltage is called a: a. Current transformer b. Step down transformer c. Potential transformer d. Step up...

An operating current transformer should never:

An operating current transformer should never: a. Be inspected until properly grounded b. Have its primary circuit opened c. Produce excessively...

A transformer works on the principle of:

A transformer works on the principle of: a. Hysteresis b. Electro-Magnetic induction c. Eddy currents d. Faraday's law e. Flux leakage Answer:...

Transformers

Transformers  a. Step up or down AC voltage b. Transforming AC voltage to DC voltage c. Rectify DC voltage to AC voltage d. Step up DC voltage e....

If Ep/Es = Np/Ns, the Ns will equal:

If Ep/Es = Np/Ns, the Ns will equal: a. Ep/NpEs b. EpEs/Np c. NpEsEp d. NpEp/Es e. NpEs/Ep Answer:...

A transformer has a primary voltage of 500 volts and 20 turns on the primary winding. If the secondary winding has 5 turns, the voltage of the secondary is:

A transformer has a primary voltage of 500 volts and 20 turns on the primary winding. If the secondary winding has 5 turns, the voltage of the secondary...

When magnetic flux produced by one coil induces an EMF in a second coil, it is called:

When magnetic flux produced by one coil induces an EMF in a second coil, it is called: a. Self inductance b. Electromagnetic induction c. Mutual inductance d....

Transformers are rated in:

Transformers are rated in: a. Polarity b. Service factor c. Watts d. Core temperature e. kVA Answer:...

Current transformers are:

Current transformers are: a. Power step-up transformers b. Current step-up transformers c. K-type transformers d. High power factor transformers e....

Three major losses which occur in a transformer are iron losses, copper losses, and:

Three major losses which occur in a transformer are iron losses, copper losses, and: a. Cooling losses b. Heat losses c. Flux leakage d. Capacitive...

Because of environmental concerns, it is no longer permissible to add ____________ to transformer oil.

Because of environmental concerns, it is no longer permissible to add ____________ to transformer oil. a. Chelates b. Anti-foaming substances c....

Transformers should be inspected at least:

Transformers should be inspected at least: a. Quarterly b. Bi-annually c. Semi-annually d. Once or twice a year e. Every five years Answer:...

Transformers are often cooled by:

Transformers are often cooled by: a. immersing the core in a refrigerant bath b. turning the transformer off at regular intervals c. force cooling...

For three-phase power, each conductor is _____ electrical degrees out of phase with the others.

For three-phase power, each conductor is _____ electrical degrees out of phase with the others. a. 30 b. 90 c. 120 d. 180 e. 360 Answer:...

An AC motor which will drop out of synchronism and simply trip when overloaded is the:

An AC motor which will drop out of synchronism and simply trip when overloaded is the: a. Slip-ring induction motor b. Induction motor c. Wound rotor...

An advantage of having an alternator with a rotating field is, that the rotating mass is:

An advantage of having an alternator with a rotating field is, that the rotating mass is: a. Stabilized b. Increased c. Reduced d. Negligible e. Easily...

The output voltage of a particular DC generator rises sharply from minimum load to full load. This generator is a ___________ generator.

The output voltage of a particular DC generator rises sharply from minimum load to full load. This generator is a ___________ generator. a. Shunt b....

In a series wound DC generator:

In a series wound DC generator: a. Brushes change DC to AC for the armature b. The shunt winding is connected taps in before the series winding c....

The load current has no effect on the field excitation of a:

The load current has no effect on the field excitation of a: a. Compound wound generator b. Series wound generator c. Shunt wound generator d. Separately...

Batteries

Batteries a) do not pose any immediate electrical hazards b) produce a steady AC voltage c) produce a varying DC voltage d) produce a steady DC voltage e)...

When using an electrical meter to check that a circuit is safe to work on, it is important to verify the proper scale, current, or both that is being used because

When using an electrical meter to check that a circuit is safe to work on, it is important to verify the proper scale, current, or both that is being...

A power meter

A power meter a) reads the actual power consumed b) does not require a multiplying factor c) reads only a small percentage of the actual load d) will...

Increasing load on a motor or other electrical device is indicated by?

Increasing load on a motor or other electrical device is indicated by? a. Increased current flow b. Increased voltage c. Increased resistance d. All...

Which electrical system is used to test with AC? 1. House wiring 2. Most power plant motors 3. Automotive wiring 4. Power plant battery vault

Which electrical system is used to test with AC?1. House wiring2. Most power plant motors3. Automotive wiring4. Power plant battery vault a. 1,2,3 b....

Which electrical system is used to test with DC? 1. House wiring 2. Most power plant motors 3. Automotive wiring 4. Power plant battery vault

Which electrical system is used to test with DC?1. House wiring2. Most power plant motors3. Automotive wiring4. Power plant battery vault a. 1,2 b....

Whenever voltmeters are connected to a direct current the:

Whenever voltmeters are connected to a direct current the: a. Positive lead must be connected to the positive point of the circuit b. Positive lead...

High amperages are stepped down to a maximum of _____ A before the kWh meter can be used to measure the amount.

High amperages are stepped down to a maximum of _____ A before the kWh meter can be used to measure the amount. a. 5 b. 32 c. 100 d. 110 e. 120 Answer:...

A kilowatt-hour meter has a small motor which:

A kilowatt-hour meter has a small motor which: a. Turns at a constant speed b. Slows down as power consumption increases c. Has a speed proportional...

Clamp-on ammeter readings may be inaccurate if:

Clamp-on ammeter readings may be inaccurate if: a. Jaws are dirty or misaligned b. Circuit voltage is too high c. Circuit resistance is too low d....

Higher voltages are stepped down to a maximum of _____ V before the kWh meter can be used to measure the amount.

Higher voltages are stepped down to a maximum of _____ V before the kWh meter can be used to measure the amount. a. 5 b. 32 c. 100 d. 110 e. 120 Answer:...

Ammeters are connected:

Ammeters are connected: a. In parallel with the circuit b. In series with the circuit c. In parallel with the circuit to measure the resistance d....

Utility companies have a surcharge to their customers based on:

Utility companies have a surcharge to their customers based on: a. The maximum voltage used b. The maximum amperage used c. System capacitance d....

The most common measurement made with an electrical meter is:

The most common measurement made with an electrical meter is: a. Amperage b. Watts c. Resistance d. Voltage e. Capacitance Answer: ...

When reading the dials of a power meter, read:

When reading the dials of a power meter, read: a. Them in the sequence shown by the letters under each b. Them from left to right c. The ones that...

An Ammeter must _____ to the electrical circuit.

An Ammeter must _____ to the electrical circuit. a. offer low resistance b. offer no resistance c. offer a slight resistance d. offer a high resistance e....

The black demand pointer of a power meter:

The black demand pointer of a power meter: a. Moves the red pointer b. Reads the current demand c. Resets automatically d. Indicates the maximum voltage...

The instrument used to measure electrical power used in a period of time, is the:

The instrument used to measure electrical power used in a period of time, is the: a. Kilowatt hour meter b. Voltmeter c. Ohmmeter d. Milli-ammeter e....

Ammeters are connected with the negative or black lead connected to the:

Ammeters are connected with the negative or black lead connected to the: a. Positive side of the circuit b. North pole of the circuit c. Negative...

A voltmeter must ______________ electrical circuit.

A voltmeter must ______________ electrical circuit. a. Offer low resistance to the b. Offer no resistance to the c. Offer slight resistance to the d....

The voltmeter is placed:

The voltmeter is placed: a. In series with the ammeter b. In parallel with the circuit c. Across the ohmmeter d. In series with the circuit e. Between...

A clamp-on ammeter measures current flow by using:

A clamp-on ammeter measures current flow by using: a. Shunting current through a milli-ammeter b. Differential current flow between two conductors c....

A property of a magnet is that it will always point in the north and south direction, when

A property of a magnet is that it will always point in the north and south direction, when a) submerged in oil b) charged with electricity c) it is...

When magnetic flux lines travel and meet in opposing directions the result can be

When magnetic flux lines travel and meet in opposing directions the result can be a) generator action b) electromagnetism c) solenoid action d) motor...

When using Fleming's Left Hand Rule, the second finger represents:

When using Fleming's Left Hand Rule, the second finger represents: a. Magnetic flux direction, for generators b. Conductor motion direction, for motors c....

When using Fleming's Left Hand Rule, the thumb represents:

When using Fleming's Left Hand Rule, the thumb represents: a. Magnetic flux direction, for generators b. Conductor motion direction, for motors c....

The major difference between an AC and a DC generator is that a AC generator has:

The major difference between an AC and a DC generator is that a AC generator has: a. A rotor b. A commutator c. Slip rings d. A field e. A stator Answer:...

In right hand rule, the second finger points to:

In right hand rule, the second finger points to: a. Direction of motion b. Direction of magnetic lines of force c. Direction of induced current flow Answer:...

In right hand rule, the index finger points to:

In right hand rule, the index finger points to: a. Direction of motion b. Direction of magnetic lines of force c. Direction of induced current flow Answer:...

In right hand rule, the thumb points to:

In right hand rule, the thumb points to: a. Direction of motion b. Direction of magnetic lines of force c. Direction of induced current flow Answer:...

The galvanometer is?

The galvanometer is? a. A sensitive current measuring device b. A sensitive voltage measuring device c. A sensitive resistance measuring device d....

In a solenoid valve, the valve is open when?

In a solenoid valve, the valve is open when? a. Current flow has stopped b. Magnetic flux is increased Answer:...

The strength of the magnetic flux about an electromagnet is:

The strength of the magnetic flux about an electromagnet is: a. Proportional to the current flowing through the coil b. Proportional to the number...

The purpose of a rectifier is to:

The purpose of a rectifier is to: a. Increase electrical voltage b. Decrease electrical voltage c. Change AC voltage to DC voltage d. Produce a constant...

The minimum voltage generated by a single loop DC generator occurs when the conductor is traveling relative to the magnetic lines of force at an angle of:

The minimum voltage generated by a single loop DC generator occurs when the conductor is traveling relative to the magnetic lines of force at an angle...

Magnetite is also known as:

Magnetite is also known as: a. Iron ore b. Non ferrous metal c. Lodestone d. Hematite e. Limonite Answer:...

If a material has a low reluctance, it has a high

If a material has a low reluctance, it has a high a. Permeability b. Conductivity c. Fluctuation d. Magnetism e. Capacitance Answer:...

The major difference between an AC and a DC generator is that a DC generator has:

The major difference between an AC and a DC generator is that a DC generator has: a. A rotor b. A commutator c. Slip rings d. A field e. A stator Answer:...

When using Fleming's Left Hand Rule, the index finger represents:

When using Fleming's Left Hand Rule, the index finger represents: a. Magnetic flux direction, for generators b. Conductor motion direction, for motors c....

Magnetic flux can be said to be:

Magnetic flux can be said to be: a. Lines of force within a magnet and flowing N to S b. Lines of force outside a magnet and flowing N to S c. A...

A current carrying conductor being moved by a magnetic field is the principle known as:

A current carrying conductor being moved by a magnetic field is the principle known as: a. Magnetic flux b. Electrolysis c. Hydro-electrics d. Generator...

Iron and steel may be magnetized by rubbing the metal with a:

Iron and steel may be magnetized by rubbing the metal with a: a. Stainless steel b. Steel wool c. Brass rod d. Magnet e. An iron filing compound Answer:...

A conductor supplied with current while in a magnetic field will:

A conductor supplied with current while in a magnetic field will: a. Tend to move at right angles to the flux lines b. Tend to remain stationary c....

When current flows in a conductor:

When current flows in a conductor: a. AC voltage is generated b. The voltage is reduced in the conductor c. The conductor develops north and south...

If a material provides resistance to magnetic flux, it is demonstrating:

If a material provides resistance to magnetic flux, it is demonstrating: a. Resistance b. Reluctance c. Impedance d. Repulsion e. Voltage drop Answer:...

The total number of lines of force in a magnetic field is:

The total number of lines of force in a magnetic field is: a. Known as the EMF b. Controlled by varying the temperature. c. Called the magnetic flux. d....

The property that determines whether a material will be easily magnetized or not is called:

The property that determines whether a material will be easily magnetized or not is called: a. Reaction b. Conductivity c. Fluctuation d. Magnetism e....

The maximum voltage generated by a single loop DC generator occurs, when the conductor is cutting the magnetic lines of force at an angle of:

The maximum voltage generated by a single loop DC generator occurs, when the conductor is cutting the magnetic lines of force at an angle of: a....

Faraday discovered:

Faraday discovered: a. The Right Hand Rule for conductors b. That a conductor will have a voltage induced if it cuts magnetic flux c. The Left Hand...

Consider a current-carrying conductor located in a magnetic field. If the current in the conductor reverses, the force tending to move the conductor will:

Consider a current-carrying conductor located in a magnetic field. If the current in the conductor reverses, the force tending to move the conductor...

The right hand rule for generators is used to:

The right hand rule for generators is used to: a. Indicate the speed of a rotor b. Determine direction of induced current flow c. Determine the frequency...

If a conductor is held stationary and a magnetic field is moved across it, it behaves according to

If a conductor is held stationary and a magnetic field is moved across it, it behaves according to a. Motor action b. Electromagnetism c. Generator...

If a conductor is forced to _____ magnetic lines of force, an electromotive force is induced in the conductor.

If a conductor is forced to _____ magnetic lines of force, an electromotive force is induced in the conductor. a. Align itself with b. Reduce c. Move...

Current flow direction and intensity, through a conductor, will:

Current flow direction and intensity, through a conductor, will: a. Affect magnetic field direction and intensity b. Affect the voltage c. Affect...

What is the composition of an atom?

What is the composition of an atom? a. Protons and neutrons in the nucleus and electrons in the shell. b. Electrons and neutrons in the nucleus and...

A conductor's resistance is

A conductor's resistance is a) directly proportional to its length b) directly proportional to its diameter c) inversely proportional to its length d)...

Under normal circumstances, the heat produced by the electrical wires of a circuit is very small due to the

Under normal circumstances, the heat produced by the electrical wires of a circuit is very small due to the a) large diameter of the conductor b)...

Most conductors tend to

Most conductors tend to a) increase in resistance with increase in temperature b) decrease in resistance with increase in temperature c) shrink when...

A conductor's resistance is

A conductor's resistance is a) directly proportional to its cross-sectional area b) directly proportional to its diameter c) inversely proportional...

Current flow is inversely proportional to the

Current flow is inversely proportional to the a) voltage b) amperage c) resistance d) wattage e) conductance Answer: ...

Current flow is

Current flow is a) proportional to the applied voltage b) proportional to the resistance c) reversed by a resistance d) increased by a decrease in...

Equivalent resistance is decreased

Equivalent resistance is decreased a) when voltage is decreased b) when a circuit is in parallel c) if the amperage is increased d) when a circuit...

In an equivalent circuit developed from a multi-resistor series circuit

In an equivalent circuit developed from a multi-resistor series circuit a) the resistance will be the reciprocal sum of the original resistances b)...

A material that conducts electrical current is called

A material that conducts electrical current is called a) a volt b) a conductor c) a circuit d) an electromotive force e) a conduit Answer:...

Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from

Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from a) positive to negative b) north to south c)...

The flow of electrons in a uniform direction is called

The flow of electrons in a uniform direction is called a) voltage drop b) electrical current flow c) potential difference d) electromotive force e)...

When a number of electrons pass a given point over a specific time period the energy may be referred to as

When a number of electrons pass a given point over a specific time period the energy may be referred to as a) an ampere b) voltage c) an ohm d) power...

In an atom the electrons

In an atom the electrons a) orbit around each other b) are repelled by the neutrons c) are attracted to the protons d) are large in size when compared...

An open circuit is one in which:

An open circuit is one in which: a. A switch is closed b. The current flows through the resistance c. The wires are bare d. A switch is open e. Voltage...

If the power dissipated by a resistor is 1.2 kW when supplied with 110 V, the amperage will be _____ A.

If the power dissipated by a resistor is 1.2 kW when supplied with 110 V, the amperage will be _____ A. a. 91.666 b. 0.11 c. 19.006 d. 10.91 e. 132 Answer:...

A basic law of electricity is, unlike charge attract each other and like charges:

A basic law of electricity is, unlike charge attract each other and like charges: a. Repel each other b. Hold each other c. Attract each other d....

An electrical device that is designed to start and stop currents flow is the:

An electrical device that is designed to start and stop currents flow is the: a. Power supply b. Fuse c. Circuit breaker d. Switch e. Resistor Answer:...

Electrons are negatively charged particles:

Electrons are negatively charged particles: a. Flowing through the atom's center b. Orbiting about the nucleus of an atom c. Firmly attached to the...

Three resistances of 20, 50 and 80 O make up a series circuit. The supply voltage is 400 V. The current flowing would be:

Three resistances of 20, 50 and 80 O make up a series circuit. The supply voltage is 400 V. The current flowing would be: a. 2.67 A b. 20 A c. 8 A d....