Archive for March 2017

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 is a function of controller output
e) causes a valve to always fail open




Answer: 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 to the cruise control on an automobile
d) will maintain measured variable at set point
e) will respond fully when deviation is high




Answer: B

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 proportional to nozzle pressure
d) fed to a final element of a loop
e) the same as the primary element output signal





Answer: A

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: B

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. Maintain steady transmitter output.
d. Change transmitter supply pressure.
e. Increase feedback bellows pressure.





Answer: E

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 variable.
c. There is no control of the final control element.
d. The operator manually adjusts the process by changing the process variable signal
e. The automatic controls have failed.






Answer: A

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 action.
d. Cannot always maintain the process variable exactly at the set-point.
e. Are sometimes called Multi-position controllers



Answer: D

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 a transmitter
d. Act to close the valve
e. Must pass through a restriction or nozzle





Answer: D

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, one transmitter and two valves.
d. Two controllers, two transmitters and two valves.
e. Two controllers, two transmitters and one valve.





Answer: E

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 tube.
d. Does not provide a permanent record.
e. Is used on a computer screen.




Answer: C

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

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. Displays only a single trend at a time
e. Is independent of the transmitter signal





Answer: A

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. Allows a view of only one process variable at a time.
e. Is normally mounted beside the final control element.





Answer: A

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 and reverse acting valve.
c. Reverse acting actuator and direct acting valve.
d. Is typically used for a burner firing rate control valve
e. Is typically used for a feedwater control valve





Answer: A

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. That is often imperceptible
d. Range of 0 to 24 hours
e. Range of 0 to 7 days





Answer: B

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 above the disc
c. a pneumatic signal exceeds 20 kPa
d. an electric motor opens the valve
e. it is de-energized





Answer: A

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 control element
d. Automatically readjusts the set point
e. Maintains the final control element position at 50%




Answer: A

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 to maintain a process variable on set-point.
d. Are used in on-off control.
e. Slow down the controller response when the process variable deviates from the setpoint.




Answer: C

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: C

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 and set-point
c. Does not allow operator input
d. Provides on-off control
e. Allows the process variable to always be maintained at the set-point




Answer: B

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 to fully shut
e. Are nearly always reverse acting



Answer: B

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 area of the piping will be increased
c) the mass quantity flowing per second will decrease
d) potential energy in the form of pressure will decrease
e) density will decrease







Answer: D

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 HP side
b) a spring which balances the differential pressure
c) applying the pressure to both sides of the diaphragm
d) reversing the reference and variable legs
e) joining the reference and variable legs upstream of the device





Answer: C

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 can be sensed
d) more power and travel of the output occurs
e) its sensitivity will be decreased






Answer: D

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 pressure varies
c. A tube that is of constant area
d. A tapered tube in which the fluid being measured flows through the tube from the bottom to the top
e. An opening that can be varied as required






Answer: D

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 as temperature decreases
d. Is not quite proportional to temperature differences
e. Varies inversely with temperature





Answer: D

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. Mid range of the float travel





Answer: C

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: C

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 very low temperature
c. They can be used at higher temperatures
d. The vaporizing temperature of the mercury is lowered
e. The thermometer can be used at higher pressure



Answer: C

A thermocouple measures:

A thermocouple measures:



a. Pressure
b. Temperature
c. Flow
d. Velocity
e. Light




Answer: B

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 to temperature
c. Increase in resistance as temperature rises
d. Work in conjunction with a thermocouple
e. Are made of Chromel and Alumel





Answer: B

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. Has two furnace connections
e. Is more difficult to read than the U-tube manometer




Answer: C

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 is measured
e. When resistance or reluctance is being measured





Answer: C

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: D

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 with a flexible rubber diaphragm
d. When reading accuracy is not critical
e. For measuring level





Answer: A

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 a reference junction
c. Two dissimilar wires connected to a battery
d. A thermally-conductive fluid, held within a fine tube
e. A thermistor, coupled to a wheatstone bridge




Answer: B

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. More expensive than electronic instruments
d. Cost of tubing is greater than electrical wiring
e. Ensuring a clean, dry air supply may be costly.




Answer: 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. Less expensive than electronic instruments
d. Safe in operation




Answer: B

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: D

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 a system's performance
d. Notifies operators of errors or faults in a system
e. Is a logic device capable of making decisions



Answer: B

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 and dry
c. The control systems have built-in redundancy
d. The compressed air supply remains above 1725 kPa
e. The control devices are fitted with noise attenuators



Answer: B

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. Constant operator attention
e. Two final control elements




Answer: D

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 need of a primary element
d. Eliminates all setpoint deviation
e. Constantly compares input signals to the set point





Answer: B

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

___ 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: D

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 two-wire system
e. Two phase three-wire system





Answer: D

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 phase four-wire system
e. Two phase three-wire system






Answer: B

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) motor control centre





Answer: B

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 a circuit breaker or fuse
c. Is called the "identified" conductor
d. Carries current in a three-wire system when the loads are balanced.
e. Is white in colour






Answer: D

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. Protect the transformer from the power source
d. Protect the plant service bus from the power source
e. Connect the plant load to the power source






Answer: A

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 phase four-wire system
e. Two phase three-wire system



Answer: A

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. The location, markings and interconnection of each terminal
c. By means of graphical symbols the function, sequence, connection and electrical relationship of each circuit
d. By means of single lines and simplified symbols the electrical distribution system in a multi-story building
e. A one line diagram where each line represents all of the conductors in the circuit





Answer: C

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. remove all grounding straps before proceeding with the work
c. only allow workers from the utility to work on the equipment
d. stay well within the safe limits of approach
e. make sure the voltages are safe before contacting live conductors





Answer: A

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: C

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) resulting from system inductance





Answer: C

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 quantities of heat
5. have a low coefficient of friction


a) 2, 3, 5
b) 1, 3, 4
c) 1, 2, 5
d) 3, 4, 5
e) 2, 4, 5





Answer: C

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 load
2. no amperage requirement
3. constant output voltage
4. supplementary AC requirement
5. rising output voltage versus load



a) 1, 2, 4
b) 2, 3, 5
c) 1, 3, 5
d) 1, 4, 5
e) 2, 3, 4





Answer: C

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 of the generator
c) regulate the current to the load
d) change the AC to DC
e) change the unit into a DC motor




Answer: A

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 correction
e) computer room power supply





Answer: A

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 magnetic lines of
force
3. number of conductors cutting the magnetic lines of force
4. diameter of the conductors
5. strength of the magnetic flux
6. diameter of the armature



a) 1, 3, 6
b) 2, 3, 5
c) 2, 5, 6
d) 1, 4, 6
e) 3, 4, 6





Answer: B

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 speed of the motor
c. A speed faster than that of the field speed of the motor




Answer: B

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 of the motor
c. A speed faster than that of the field speed of the motor





Answer: A

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. power recorded by a kWh meter.





Answer: C

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. Improve the power factor of a system
e. Start induction motors





Answer: D

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. Induction motors





Answer: D

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. Are self-excited
e. Are series-wound





Answer: 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: D

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 friction and wear at the commutator
d. carbon brushes are easy to manufacture
e. they are inexpensive




Answer: C

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) Autotransformer





Answer: 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: E

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" of the transformer. This transformer is called?



a) current transformer
b) core type transformer
c) potential transformer
d) shell type transformer
e) resistance indicator




Answer: B

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 necessitate better wire insulation
e) a very low safety hazard






Answer: A

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 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



a) 1, 3, 5
b) 2, 3, 4
c) 1, 4, 5
d) 2, 3, 4, 5
e) 2, 4, 5





Answer: A

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) increasing the secondary voltage






Answer: C

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 induction





Answer: B

Transformers require:

Transformers require:



a. More maintenance than other electric machinery
b. Less maintenance than most other electric machinery
c. No maintenance
d. Inspection every three years
e. Inspection every month





Answer: 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 circuits
e. Have an equal ratio of transformation





Answer: A

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 iron core.
c. Use two common forms of construction known as the internal type and the external type.
d. Are very low in efficiency.
e. Are used in all power supplies.



Answer: A

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 high voltages
d. Have its secondary circuit opened first
e. Have its secondary connected to a meter





Answer: D

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: B

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. Step down DC current





Answer: A

Transformers are rated in:

Transformers are rated in:



a. Polarity
b. Service factor
c. Watts
d. Core temperature
e. kVA






Answer: E

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. Voltage step-up transformers





Answer: E

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: D

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 with fans
d. immersing the core in cooling water
e. using windings with less insulation





Answer: C

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. Load current passes through the field windings
d. The shunt winding is connected after the series winding
e. There are no field poles




Answer: 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 excited generator
e. Short-shunt generator




Answer: D

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) produce a varying AC voltage



Answer: D

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 used because




a) it may appear that no voltage or current is present and therefore safe
b) the meter will be damaged
c) the user will be subjecting himself or herself to danger
d) the main high voltage transformer circuit will be opened
e) electrical wiring will be damaged by fire or overheating







Answer: A

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 calculate the actual cost of the power
e) does not take into account the system voltage





Answer: D

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 must be connected to the negative point in the circuit
c. Positive lead must be connected to the neutral point in the circuit
d. Negative lead must be disconnected from the circuit
e. Positive lead must be disconnected from the circuit






Answer: A

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 to power consumption
d. Indicates the multiplier to be used when reading the meter
e. Moves the meter demand pointer






Answer: C

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. Circuit power is too high
e. Conductor insulation is too thick





Answer: A

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. So that voltage will bypass the meter
e. To the negative and positive terminals of the battery





Answer: B

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 rotate clockwise first
d. Them from right to left
e. Them only at the request of the utility company







Answer: D

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. apply a voltage






Answer: A

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 being drawn
e. Must be manually reset





Answer: E

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. Offer high resistance to the
e. Interfere with the





Answer: 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 the battery and the first resistance





Answer: B

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 basic transformer principle
d. A portion of circuit resistance
e. Electromagnetism





Answer: C

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. Conductor motion direction, for generators
d. Flux direction, for motors
e. Direction of current flow, for motors.




Answer: E

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. Conductor motion direction, for generators
d. Flux direction, for motors
e. Direction of current flow, for motors.





Answer: B

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: C

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: B

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: A

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. All of the above





Answer: A

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 of turns in the coil
c. Proportional the permeability of the core
d. A and B
e. All of the above





Answer: E

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 voltage to a pulsating voltage






Answer: C

Magnetite is also known as:

Magnetite is also known as:




a. Iron ore
b. Non ferrous metal
c. Lodestone
d. Hematite
e. Limonite





Answer: C

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. Conductor motion direction, for generators
d. Flux direction, for motors
e. Direction of current flow, for motors.








Answer: D

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 magnetic field
d. Lines of force flowing S to N outside a magnet
e. Lines of force flowing in a magnet






Answer: B

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. Want to move with the flux lines
d. Have a current induced into it
e. Demonstrate generator theory







Answer: A

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 poles
d. A circular magnetic field is set up around the conductor
e. All magnetic forces are dissipated




Answer: D

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. Determined by the north magnetic pole.
e. Depends on the force of gravity





Answer: C

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 Rule for motors
d. The Left Hand Rule for generators
e. That current flows from positive to negative




Answer: B

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 of an alternator
d. Determine direction of motor rotation
e. Determine magnetic flux rotation




Answer: B

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 the resistance of a circuit
d. Not affect the electromagnetic field direction
e. Not affect the electromagnetic field intensity




Answer: A

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 protons in the shell.
c. Electrons and nucleus in the neutron and protons in the shell.
d. Protons and electrons in the nucleus and neutrons in the shell.






Answer: A

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) not affected by the cross-sectional area
e) measured in micro-Newtons







Answer: A

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 heated
d) melt when voltage is applied
e) oscillate when voltage is applied







Answer: A

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 to its cross-sectional area
d) not affected by the cross-sectional area
e) measured in micro-Newtons






Answer: C

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 applied voltage
e) inversely proportional to the applied voltage





Answer: A

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 is in series
e) when a circuit is opened





Answer: B

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) voltage drop will be the same as for each of the original resistances
c) the sum of voltage drops across the original resistances will be equal to the voltage drop of the equivalent circuit
d) original circuit resistances will each have to be the same as the equivalent resistance
e) amperage flowing will be different than the original circuit amperage flowing through each resistance






Answer: C

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 to the protons
e) orbit only the neutrons






Answer: C

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 may exit






Answer: D

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 neutrons of an atom
d. That can easily flow through insulators
e. That seek open circuits






Answer: B
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