Which of the following steps is NOT part of the start-up procedure of centrifugal compressor refrigerating systems?

Which of the following steps is NOT part of the start-up procedure of centrifugal compressor refrigerating systems? a) Check the refrigerant levels. b)...

What is best way to spot changes in the performance of an absorption refrigeration unit?

What is best way to spot changes in the performance of an absorption refrigeration unit? a) the use of a preventative maintenance program. b) adjusting...

After a chilled water low temperature automatically cut out, then the chiller may restart

After a chilled water low temperature automatically cut out, then the chiller may restart a) If the cooling tower starts to run b) If the condenser...

Which one of the following refrigerant leak test procedures produces the deadly gas phosgene?

Which one of the following refrigerant leak test procedures produces the deadly gas phosgene? a) litmus b) halide torch c) sulphur candle d) leak...

In absorption refrigeration, the low pressure ammonia vapour is drawn into the ___________ from the ____________.

In absorption refrigeration, the low pressure ammonia vapour is drawn into the ___________ from the ____________. a) evaporator, condenser b) generator,...

With hermetically sealed motors, the stator electrical windings are protected from direct contact with the _______ by being sealed in a material that is impervious to moisture.

With hermetically sealed motors, the stator electrical windings are protected from direct contact with the _______ by being sealed in a material that...

The temperature relief device on a hot water tank protects the tank from dangerously high water temperatures; it should be set to open at _____ or slightly less.

The temperature relief device on a hot water tank protects the tank from dangerously high water temperatures; it should be set to open at _____ or slightly...

A liquid receiver with an internal volume exceeding 0.85 m3 liquid refrigerant that can be isolated from the rest of the system shall be protected by a pressure relief device that has a capacity to prevent the vessel pressure from rising more than ____% above the relief device setting.

A liquid receiver with an internal volume exceeding 0.85 m3 liquid refrigerant that can be isolated from the rest of the system shall be protected by...

If there is a crystallization upon shutdown a possible corrective action is to

If there is a crystallization upon shutdown a possible corrective action is to a) add octyl alcohol charge b) purge the system c) adjust cooling...

Which of the following are elements of a mechanical purging system?

Which of the following are elements of a mechanical purging system? i) purge pickup tube ii) purge chamber iii) manual shutoff valve iv) safety solenoid...

When shutting down the refrigeration system for a weekend or less which of the following is a correct shutdown procedure?

When shutting down the refrigeration system for a weekend or less which of the following is a correct shutdown procedure? a) Drain the cooling water...

During seasonal startup, when should the purge pump be started?

During seasonal startup, when should the purge pump be started? a) Simultaneously with the absorption unit b) One half hour before the absorption...

An increased air flow increases heat loss of the body by which of the following methods:

An increased air flow increases heat loss of the body by which of the following methods: i) convection ii) conduction iii) evaporation a) only b)...

Air used for ventilating purposes in an office building should be kept within certain range of relative humidity as indicated below.

Air used for ventilating purposes in an office building should be kept within certain range of relative humidity as indicated below. a) 30 to 50 b)...

Shock Effect is

Shock Effect is a) a constant dry-bulb temperature of 25 degrees C b) a constant effective temperature of 15 degrees C c) the discomfort felt when...

The comfort of human beings is affected by

The comfort of human beings is affected by a) temperature b) relative humidity c) air cleanliness d) air movement e) all of the above Answer:...

The body needs considerable time to adjust when moving from one space to another when temperature and humidity conditions vary widely. This may be described as

The body needs considerable time to adjust when moving from one space to another when temperature and humidity conditions vary widely. This may be described...

The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which affects comfort?

The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which...

Evaporative cooling is

Evaporative cooling is a) heating and humidification of the air b) heating and dehumidification of the air c) cooling and humidification of the air d)...

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the heating capacity of the coil?

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees...

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the change in enthalpy?

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees...

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the volume of air leaving the coil?

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees...

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the volume of air leaving the coil?

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees...

If 5.0 cubic metres/second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet-bulb, and leaves the heating coil at 30 degrees C dry-bulb, what is the mass of air flowing?

If 5.0 cubic metres/second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet-bulb, and leaves the heating coil at 30 degrees...

During sensible cooling

During sensible cooling a) relative humidity decreases b) enthalpy increases c) wet-bulb temperature increases d) relative humidity increases e) dewpoint...

During sensible heating, only

During sensible heating, only a) the relative humidity remains unchanged b) the relative humidity increases c) the dewpoint temperature increases d)...

During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and

During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and a) the dewpoint remains unchanged b) the specific humidity...

Using the psychrometric chart, find the specific volume, if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C.

Using the psychrometric chart, find the specific volume, if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a)...

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C.

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 55...

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C.

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a)...

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C.

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees...

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C.

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a)...

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C.

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C. a)...

Using the psychrometric chart, find the specific volume if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C.

Using the psychrometric chart, find the specific volume if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a)...

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C.

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a) 40...

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C.

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a)...

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C.

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees...

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 20 degrees Celsius and the wet-bulb temperature is 15 degrees Celsius.

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 20 degrees Celsius and the wet-bulb temperature is 15 degrees...

Which of the following statements about cooling and dehumidification is false?

Which of the following statements about cooling and dehumidification is false? a) Air washers are used to dehumidify air. b) When air leaves the washer...

During sensible heating which of the following results is true?

During sensible heating which of the following results is true? a) dry-bulb temperature lowers b) wet-bulb temperature remains constant c) relative...

The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb scale is defined as

The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb...

Which of the following properties cannot be found on the psychrometric chart?

Which of the following properties cannot be found on the psychrometric chart? a) dewpoint temperature b) partial pressure c) specific humidity d)...

Enthalpy values are found on a psychrometric chart by

Enthalpy values are found on a psychrometric chart by a) plotting a line through the required point on the chart parallel to the lines of the two...

Specific volume on a psychrometric chart

Specific volume on a psychrometric chart a) is plotted on vertical lines and read on the horizontal scale at bottom of the chart b) is plotted on...

Specific humidity scale on a psychrometric chart is

Specific humidity scale on a psychrometric chart is a) along the horizontal axis at the bottom of the chart b) along the vertical axis of the chart...

Specific humidity is

Specific humidity is a) the ratio of the actual amount of water vapour present in the air to the amount of water vapour the air can contain when it...

Relative humidity is plotted on a psychrometric chart

Relative humidity is plotted on a psychrometric chart a) on lines curved upwards from the lower left to the right side of the chart b) along the horizontal...

The dewpoint temperature scale is read on a psychrometric chart

The dewpoint temperature scale is read on a psychrometric chart a) along the top horizontal scale b) along the saturation line, same scale as wet-bulb...

The wet-bulb temperature scale is read on a psychometric chart

The wet-bulb temperature scale is read on a psychometric chart a) along the right vertical axis b) along the left vertical axis c) along the saturation...

The dry-bulb temperature scale is read on a psychometric chart

The dry-bulb temperature scale is read on a psychometric chart a) along the left vertical axis b) along the right vertical axis c) along the saturation...

In the SI (metric) system the enthalpy of air is measured in

In the SI (metric) system the enthalpy of air is measured in a) degrees C b) % c) BTU's/kg of dry air d) kJ/kg of dry air e) kW/kg of dry air ...

Enthalpy of air depends on

Enthalpy of air depends on a) the pressure, temperature, and relative humidity of the air b) the relative humidity of the air only c) the pressure...

Standard air is

Standard air is a) the volume of 1 kg of air at 15 degrees Celsius and 100 kpa b) the mass of 1 cubic metre of air at atmospheric conditions c) the...

The specific volume of air is

The specific volume of air is a) the volume of 1 kg of air at atmospheric pressure expressed in cubic centimetres b) the volume of 1 gram of air...

Which of the following instruments use a battery operated fan to draw air over the thermometer bulbs?

Which of the following instruments use a battery operated fan to draw air over the thermometer bulbs? a) hydrometer b) aspirating psychrometer c)...

Psychrometers are

Psychrometers are a) instruments used to determine the purity of air b) meters used to measure air speed c) meters used to measure the density of...

What is wet-bulb depression?

What is wet-bulb depression? a) lowering of the thermometer bulb into water b) sum of the wet-bulb temperature and the dry-bulb temperature c) decrease...

Wet-bulb temperature is

Wet-bulb temperature is a) the temperature indicated by a thermometer having its bulb covered by a water-wetted wick or cloth and the wet bulb is...

Dry-bulb temperature is

Dry-bulb temperature is a) the absolute temperature corresponding to the atmospheric pressure b) the dewpoint temperature c) not required to find...

Dew Point can be best defined as

Dew Point can be best defined as a) the absolute temperature at which air, upon heating, will evaporate moisture b) the absolute temperature at which...

Relative humidity is

Relative humidity is a) the actual mass of moisture present in a specific amount of air b) the ratio of the mass of moisture contained in a specific...

Absolute or specific humidity is

Absolute or specific humidity is a) the actual mass of moisture present in a specific amount of air b) the maximum mass of moisture that a specific...

Which law describes the existence of moisture in the air in vapour or evaporated state?

Which law describes the existence of moisture in the air in vapour or evaporated state? a) Newton's laws of gravity b) 1st law of Thermodynamics c)...

The difference between the wet and dry bulb readings is called the

The difference between the wet and dry bulb readings is called the a) wet bulb depression b) relative humidity c) dewpoint d) correction factor e)...

A device for measuring relative humidity is called

A device for measuring relative humidity is called a) a dew point tester b) an R.H. gauge c) an aspirating gauge d) a psychrometer e) a chronome...

The term "relative humidity" applies to

The term "relative humidity" applies to a) the percentage of moisture in the air as compared to the amount of moisture the air can hold at a specific...

Air conditioning involves

Air conditioning involves a) only the cooling of the air in a conditioned space b) the control of the air temperature, the control of humidity, air...

The composition of pure dry air is generally taken to be

The composition of pure dry air is generally taken to be a) 23.2% oxygen and 76.8% nitrogen by volume b) 21% oxygen and 79% nitrogen by weight c)...

Psychrometry is

Psychrometry is a) the study of the behaviour of people b) the study of the behaviour of air c) the study of the behaviour of water vapour d) the...

The heat content of air is called the

The heat content of air is called the a) temperature of the air b) humidity of the air c) enthalpy of the air d) psychrometry of the air e) entropy...

The volume of standard air is

The volume of standard air is a) 0.533 kg/cubic metres of dry air b) 0.633 kg/cubic metres of dry air c) 0.733 kg/cubic metres of dry air d) 0.833...

The dewpoint is the

The dewpoint is the a) temperature at which dew forms on the grass b) temperature at which water vapour will start to be absorbed into the air c)...

Relative humidity is

Relative humidity is a) the ratio of water vapour in the air compared to the total amount water vapour the air could contain at a given temperature b)...

Dalton's Law of partial pressure states that

Dalton's Law of partial pressure states that a) for every pressure there is an equal and opposite pressure b) in a mixture of two or more gases each...

Air is approximately what composition by volume?

Air is approximately what composition by volume? a) 79% N² and 21% CO² b) 79% O² and 21% N² c) 79% N² and 21% O² d) 79% CO² and 21% O² e) 79% H²...

A process used in refineries to separate components by using the property of different boiling temperatures is:

A process used in refineries to separate components by using the property of different boiling temperatures is: a. Platforming b. Stabilization c....

The two types of wood pulping processes are the mechanical and the

The two types of wood pulping processes are the mechanical and the a) thermal b) industrial c) hydraulic d) triple train e) chemical Answer:&n...

Wood pulp production by chemical means requires the removal of the _____ in order to obtain the cellulose fiber.

Wood pulp production by chemical means requires the removal of the _____ in order to obtain the cellulose fiber. a. Pentosan b. Lignin c. Tannin d....

The contaminants in natural gas may include:

The contaminants in natural gas may include: a. Hydrogen sulphide b. Pentane c. Hexane d. Methane e. Oxygen Answer: ...

The hydrocarbons in natural gas may include:

The hydrocarbons in natural gas may include: a. Carbon dioxide b. Ethane c. Nitrogen d. Hydrogen sulphide e. Carbonic acid Answer: ...

When petroleum oils break down or crack due to high temperature, the products formed are insoluble and:

When petroleum oils break down or crack due to high temperature, the products formed are insoluble and:  a. More viscous b. Less viscous c. Highly...

Prior to a worker entering the steam drum of an off-line boiler that is connected to a common, pressurized steam header, the

Prior to a worker entering the steam drum of an off-line boiler that is connected to a common, pressurized steam header, the a. Worker must be equipped...

When shutting down a boiler for internal cleaning, you should:

When shutting down a boiler for internal cleaning, you should: a. Shut down the boiler, then fill it completely with chemically treated water b....

A steam heating boiler that is to be shut down for six months during the summer, should be:

A steam heating boiler that is to be shut down for six months during the summer, should be: a. Drained, thoroughly dried out, have desiccant placed...

It is recommended that a new boiler be shut down, drained, opened up, flushed out and inspected after the first _____ months of operation.

It is recommended that a new boiler be shut down, drained, opened up, flushed out and inspected after the first _____ months of operation. a. Two b....

An eye made by using a Crosby clip will have a strength factor of

An eye made by using a Crosby clip will have a strength factor of a) 80% b) 50% c) 95% d) 75% e) 90% Answer: ...

Stove bolt nuts are usually:

Stove bolt nuts are usually: a. Hexagonal b. Square c. Fine thread d. Self locking e. Left hand thread Answer: ...

Taper, plug and bottoming are types of:

Taper, plug and bottoming are types of: a. Wrenches b. Dies c. Files d. Punches e. Taps Answer: ...

Who is responsible for providing safe working conditions in the plant?

Who is responsible for providing safe working conditions in the plant? a. Management b. The Boilers Branch c. Worker's Compensation Occupational...

Heat lost from a building is:

Heat lost from a building is: a. Dependent on the shape of the openings in a building b. Independent of indoor air temperature c. Greater on windier...

Thermal resistance (R) may be defined as the:

Thermal resistance (R) may be defined as the: a. Quantity of heat flow per unit time (in Watts) b. Ability of a material of uniform thickness to...

The quickest method of calculating air infiltration into a building is the

The quickest method of calculating air infiltration into a building is the a. air change method b. crack method c. solar method d. conduction method e....

HVAC control systems maintain minimum _______ air during periods of extreme high and low ambient temperature.

HVAC control systems maintain minimum _______ air during periods of extreme high and low ambient temperature. a. Return b. Supply c. Ventilation d....

In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required.

In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required. a. Gradual switch b. Offset returned...

A refrigeration system used in HVAC service, that can provide both heating and cooling, is a

A refrigeration system used in HVAC service, that can provide both heating and cooling, is a a. Run around system b. Heat valve c. Heat pump d. Regenerative...

The performance of a heat pump system (or C.O.P.) is the ratio of:

The performance of a heat pump system (or C.O.P.) is the ratio of: a. Heat output divided by heat input b. Heat input divided by energy output c....

The heat recovery system which has a capillary wick structure consisting of fine circumferential striations machined on its internal surface is called a:

The heat recovery system which has a capillary wick structure consisting of fine circumferential striations machined on its internal surface is called...

Which of the following is NOT an advantage of a run-around heat recovery system?

Which of the following is NOT an advantage of a run-around heat recovery system? a. The system can be retrofitted to existing HVAC systems with relative...

What is the name of the heat recovery system that consists of two finned tube heat exchangers?

What is the name of the heat recovery system that consists of two finned tube heat exchangers? a. A run around system b. A heat valve c. A heat pump d....

If operating personnel from an old building are going to be transferred to the new building the system installed in the new building will be the same as in the older building because all the personnel are familiar with that system. This type of system selection is based mainly on which of the following factors?

If operating personnel from an old building are going to be transferred to the new building the system installed in the new building will be the same...

The funds available for the air conditioning portion of the building refers to which factor of system selection?

The funds available for the air conditioning portion of the building refers to which factor of system selection? a) Building function b) Capital...

Which of the following air handling systems is not appropriate for a single zone application?

Which of the following air handling systems is not appropriate for a single zone application? a. A packaged air conditioner b. A dual duct system c....

To offset internal and external heat gains, a building requires

To offset internal and external heat gains, a building requires a. A humidifier b. A heat source c. Ventilation d. A cooling source e. A dehumid...

Glycol coils using ethylene glycol:

Glycol coils using ethylene glycol: a. Do not require air vents. b. Are not recommended for use in heating and air conditioning systems in the food...

Ducts of large dimensions must be diagonally creased to

Ducts of large dimensions must be diagonally creased to a) provide stiffness b) allow gradual duct size change c) decrease duct weight d) increase...

Seepage in return air ducts returned within the conditioned space

Seepage in return air ducts returned within the conditioned space a. adds to the amount of air needed to supply the cooled space b. ruins the duct...

Forward curved fans

Forward curved fans a) require larger size shafts than backward inclined fans b) are desirable when air handling units have two or more fans mounted...

Backward inclined centrifugal fans:

Backward inclined centrifugal fans: a. Require more horsepower than the forward curved fans to deliver a specified volume of air b. Are quieter than...

To minimize fan vibration problems and premature fan belt wear, it is proper to use

To minimize fan vibration problems and premature fan belt wear, it is proper to use a. Direct drive fans b. Balanced Sheaves c. V-Belt drives d....

The two general groups of fans are:

The two general groups of fans are: a. Positive displacement and dynamic b. High pressure and low pressure c. High volume and low volume d. Positive...

Using the psychrometric chart, find the dew point temperature at a dry bulb temperature of 20°C and a wet bulb temperature of 15°C.

Using the psychrometric chart, find the dew point temperature at a dry bulb temperature of 20°C and a wet bulb temperature of 15°C. a. 20°C b. 14°C c....

A measure of comfort that involves the combined effects of the dry bulb temperature, relative humidity and air movement is defined as:

A measure of comfort that involves the combined effects of the dry bulb temperature, relative humidity and air movement is defined as: a. Comfort...

In a absorption refrigeration system, which one is NOT a possible cause for decreased capacity in the system?

In a absorption refrigeration system, which one is NOT a possible cause for decreased capacity in the system? a. Noncondensables in machine b. Purging...

Octal alcohol is added to the lithium bromide solution to:

Octal alcohol is added to the lithium bromide solution to: a. Act as a drying agent b. Act as a wetting agent c. Prevent crystallization d. Help...

The type of operation that stops a refrigeration compressor when the temperature setpoint of the cooled substance is reached, then re-starts the compressor when the temperature set-point is exceeded, is called:

The type of operation that stops a refrigeration compressor when the temperature setpoint of the cooled substance is reached, then re-starts the compressor...

The CSA B52 code requires that pressure limiting devices shall be provided on all systems operating above atmospheric pressure, except on a factory sealed system containing less than _____ of group A1 refrigerant:

The CSA B52 code requires that pressure limiting devices shall be provided on all systems operating above atmospheric pressure, except on a factory...

Which of the following are direct expansion evaporators and flooded evaporators?

Which of the following are direct expansion evaporators and flooded evaporators? 1. bare tube 2. the plate surface 3. the shell and tube 4. the finned...

Rotary compressor types are?

Rotary compressor types are? i. Open type ii. Hermetic type iii. Stationary single-blade design iv. Rotating sliding vane design v. Helical rotor design a....

Which of the following statements about a system that circulates warm brine or water back to a chiller tank is true?

Which of the following statements about a system that circulates warm brine or water back to a chiller tank is true? a) The system is a direct refrigeration...

Which of the following are principal parts in a closed cycle compression refrigeration system?

Which of the following are principal parts in a closed cycle compression refrigeration system? i) Absorber ii) Evaporator iii) Compressor iv) Condenser a)...

The type of brine used for skating and hockey rink refrigeration systems is usually:

The type of brine used for skating and hockey rink refrigeration systems is usually: a. Calcium sulphate b. Calcium chloride c. Magnesium chloride d....

The amount of liquid that may flash into vapour can be as high as?

The amount of liquid that may flash into vapour can be as high as? a. 30% b. 40% c. 50% d. 60% e. 70% Answer: ...

What is the name of the refrigerant that has the following characteristics? It is non-flammable, odourless, non-toxic, it does not have a corrosive effect on metal if water is present and at atmospheric pressure it has a boiling point of approximately -40.6°C.

What is the name of the refrigerant that has the following characteristics? It is non-flammable, odourless, non-toxic, it does not have a corrosive...

Group "A" refrigerants are:

Group "A" refrigerants are: a. Non-flammable b. Low-flammable c. Low-toxic d. Low-toxic and flammable e. High-toxic and flammable Answer: ...

A refrigerant in the "B" Group that is used more than others in its group in refrigeration systems is:

A refrigerant in the "B" Group that is used more than others in its group in refrigeration systems is: a. R-290 b. Ammonia c. R-134a d. R-22 e. ...

The rate at which a system will remove heat from the refrigerated medium is defined as

The rate at which a system will remove heat from the refrigerated medium is defined as a) coefficient of performance b) net refrigerating effect c)...

In the case of a simple ice box which of the following heat transfers is correct?

In the case of a simple ice box which of the following heat transfers is correct? a) Air loses latent heat, ice does not gain any heat. b) Air loses...

If the first column of a refrigeration table lists the saturation temperature of a refrigerant, which column will most likely list the saturation pressure?

If the first column of a refrigeration table lists the saturation temperature of a refrigerant, which column will most likely list the saturation pressure? a....

Which of the following correctly describes the heat transfer that takes place in a simple ice-box?

Which of the following correctly describes the heat transfer that takes place in a simple ice-box? a. There is a net loss of heat from the system,...

Which of the following has a trap as an integral part of the fixture?

Which of the following has a trap as an integral part of the fixture? a. A toilet b. A sink c. A roof drain d. A laundry tub e. A bathtub Answ...

In large buildings approximately what percentage of the electrical load is lighting?

In large buildings approximately what percentage of the electrical load is lighting? a. 60% b. 40% c. 70% d. 75% e. 80% Answer: ...

Electronic controllers can be divided into two types

Electronic controllers can be divided into two types a) on or off b) modulating and direct acting c) indirect and direct acting d) on or off and modulating e)...

A pressure sensor converts pressure changes into:

A pressure sensor converts pressure changes into: a. An electrical signal b. A change in electrical resistance c. Variables such as voltage, current,...

In a basic electric control system an example of a controlled device is a:

In a basic electric control system an example of a controlled device is a: a. fuel valve b. thermostat c. pressure-stat d. humidistat e. flow sw...

In a self-contained control system the energy for operation is provided by:

In a self-contained control system the energy for operation is provided by: a. Electricity b. Air pressure c. The reaction of the sensing device d....

The most common type of damper operator is a:

The most common type of damper operator is a: a. Relay b. Spring c. Bellows d. Piston e. Pilot positioner Answer: ...

Pneumatic controllers are divided into two basic classes,:

Pneumatic controllers are divided into two basic classes,: a. Direct and reverse b. Off/on and proportional c. Positive and negative action d. Bleed...

In a non-bleed type controller the device that senses a change in room temperature is called a:

In a non-bleed type controller the device that senses a change in room temperature is called a: a. Sensing valve b. Bellows c. Valve chamber d. Temperature...

The device used to maintain a constant pressure throughout a pneumatic control system is called a:

The device used to maintain a constant pressure throughout a pneumatic control system is called a: a. Reducing valve b. Gradual switch c. Pneumatic...

A flame failure device is unresponsive to:

A flame failure device is unresponsive to: a. Ultraviolet light b. Infra-red light c. Visible light d. Fuel flow e. Heat Answer: ...

A levelling indicator is found on

A levelling indicator is found on a) the casing of a heating boiler b) a low-water fuel cutoff switch c) a boiler feedwater pump d) a modutrol motor e)...

The type of combustion control frequently used on a small packaged boiler is

The type of combustion control frequently used on a small packaged boiler is a. a semi-automatic control b. a modulating control c. a proportional...

The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element.

The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element. a. Pressure b. Level c. Temperature d....

Which of the following is the most common type of warm air outlets used in a house?

Which of the following is the most common type of warm air outlets used in a house? a. Ceiling diffusers b. Wall diffusers c. Perforated panels d....

When fan belts show signs of fraying, cracking, and wear, they should be:

When fan belts show signs of fraying, cracking, and wear, they should be: a. Repaired b. Replaced c. Reported d. Re-tightened e. Realigned Ans...

In a pulse combination furnace, the stated efficiency is:

In a pulse combination furnace, the stated efficiency is: a. 94 - 98% b. 80 - 95% c. 70 - 75% d. 60 - 70% e. 50 - 60% Answer: ...

The maximum temperature of water in a gravity hot water system is:

The maximum temperature of water in a gravity hot water system is: a. 65°C b. 70°C c. 77°C d. 87°C e. 120°C Answer: ...

In a one pipe hot water system, the fitting that directs the water to each converter is called the:

In a one pipe hot water system, the fitting that directs the water to each converter is called the: a. Diverter b. Balancing valve c. Vent valve d....

In the case of radiators and convectors, the main sources of trouble are the:

In the case of radiators and convectors, the main sources of trouble are the: a. Air vents b. Fins c. Push nipples d. Connecting rods e. Valves and...

When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called:

When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called: a. Flooded...

The level in the condensate receiver may be automatically controlled by a:

The level in the condensate receiver may be automatically controlled by a: a. Float switch b. Pressure reducing valve c. Gate valve d. Drain valve e....

If the low-water fuel cutoff and/or the high limit control are equipped with a trip-out device on a boiler, it is recommended as part of the startup preparation to

If the low-water fuel cutoff and/or the high limit control are equipped with a trip-out device on a boiler, it is recommended as part of the startup...

The most important rule in safe operation of a steam heating boiler is:

The most important rule in safe operation of a steam heating boiler is: a. Operate the burner properly b. Keep the water level in the boiler at...

How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber?

How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber? a. Daily b. Monthly c....

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set.

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at...

An atmospheric premix burner has air entering around the flame that is termed:

An atmospheric premix burner has air entering around the flame that is termed: a. Primary air b. Secondary air c. Atomizing air d. Combustion air e....

Atmospheric burners are used for:

Atmospheric burners are used for: a. Gas stoves, hot water heaters, heating furnaces and many heating boilers b. Ring type burners c. Coal firing d....

The compressed air used as atomizing air in the air atomizing oil burner is also called:

The compressed air used as atomizing air in the air atomizing oil burner is also called: a. Secondary air b. Primary air c. Pre-mixed air d. Combustion...

The steam and water spaces of a cast iron sectional boiler are connected by:

The steam and water spaces of a cast iron sectional boiler are connected by: a. Tie rods b. Tie nipples c. Hydraulic jacks d. Steel studs e. Push...

In a vertical sectional boiler, the sections are placed:

In a vertical sectional boiler, the sections are placed: a. One above the other b. Side by side c. On the furnace d. Above the draft hood e. 180°...

When personal computers are linked together and information flows between them, it is called:

When personal computers are linked together and information flows between them, it is called: a. Telecommunicating b. Networking c. Teleconferencing d....

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....

A thermocouple measures:

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

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 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: ...

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....

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...

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 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....

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 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 stato...

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 stato...

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....

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...

Electrical power can be determined by the formula

Electrical power can be determined by the formula a) P = IE b) I = ER c) E = IR d) R = EI e) P = IR Answer: ...

The force required to produce a current of one ampere through a resistance of one ohm, is

The force required to produce a current of one ampere through a resistance of one ohm, is a) one watt b) one megawatt c) one volt d) one kilovolt e)...

If the applied voltage in a circuit is 120 volts and the current flow is 3 amperes the resistance of this circuit is

If the applied voltage in a circuit is 120 volts and the current flow is 3 amperes the resistance of this circuit is a) 40 Watts b) .025 Ohms c)...

Three resistors of 20, 60 and 120 ohms are connected in parallel and the circuit amperage is 60. The applied voltage would be

Three resistors of 20, 60 and 120 ohms are connected in parallel and the circuit amperage is 60. The applied voltage would be a) 7,200 b) 12,000 c)...

Ohms Law can be stated as

Ohms Law can be stated as a) E = IR b) R = I/E c) I = R/E d) volts equals ohms divided by amperes e) watts times ohms equals volts Answer:&nbs...

An electrical device which is designed to start and stop current flow is the

An electrical device which is designed to start and stop current flow is the a) potentiometer b) fuse c) circuit breaker d) switch e) resistor ...

The flow of electrons in a uniform direction from atom to atom through a circuit, is known as

The flow of electrons in a uniform direction from atom to atom through a circuit, is known as a) electromotive force b) potential difference c) a...

A collar thrust bearing:

A collar thrust bearing: 1. can support more load than a Michell thrust bearing 2. can prevent a rotating shaft from moving in both axial directions 3....

When grease is used in an antifriction bearing, the bearing housing should not be filled _____ full.

When grease is used in an antifriction bearing, the bearing housing should not be filled _____ full. a. more than 1/4 b. more than 1/3 c. more than...

A collar thrust bearing:

A collar thrust bearing: a. Must have a shiny surface b. Can support more load than a Michell thrust bearing c. Is an anti-friction type bearing d....

When inspecting a dismantled bearing, the first indication of a failing bearing is:

When inspecting a dismantled bearing, the first indication of a failing bearing is: a. Cracked balls b. Roughness c. Discoloration d. Rusting or...

A thrust bearing which does not utilize the oil wedge principle of lubrication is the:

A thrust bearing which does not utilize the oil wedge principle of lubrication is the: a. Michell type b. Collar type c. Flotation type d. Kingsbury...

Which liquid lubricant is the most commonly used class?

Which liquid lubricant is the most commonly used class? a. Mineral oils b. Fixed oils c. Synthetic oils d. High viscosity oil e. Low viscosity o...

Sodium (Soda) Base Greases are suitable for temperatures as high as ___°C.

Sodium (Soda) Base Greases are suitable for temperatures as high as ___°C. a. 150 b. 120 c. 180 d. 100 e. 160 Answer: ...

Which of the following has the greatest effect on the viscosity of lubrication oil?

Which of the following has the greatest effect on the viscosity of lubrication oil? a. Pressure b. Load c. Flow d. Temperature e. Speed Answer...

The property of oil that indicates its ability to support a load is:

The property of oil that indicates its ability to support a load is: a. Viscosity b. Viscosity index c. Pour point d. Floc point e. Consistency ...

Grease:

Grease: a. Is a semi-liquid b. Is an excellent high-speed, low load lubricant c. Attracts dirt and water to bearings, leading to premature failure d....

Intercoolers:

Intercoolers: a. Must have a drain b. Are more efficient when cooled with air than with water c. Are used on double acting single stage compressors d....

Rotary pumps:

Rotary pumps: 1. are high pressure pumps 2. must be primed 3. use mechanical seals 4. are positive displacement pumps a) 1, 2 b) 2, 3 c) 1, 4 d)...

When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump:

When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump: a. Positive displacement b. Single acting c....

Using a compressed air starting motor is a popular method of starting:

Using a compressed air starting motor is a popular method of starting: a. A large stationary diesel engine b. A small two-stroke engine c. A gasoline...

Large internal combustion engines are cooled with:

Large internal combustion engines are cooled with: a. Water jackets b. Evaporation c. Air cooling d. Condensers e. Refrigeration Answer: ...

A simple gas turbine is one without reheaters or:

A simple gas turbine is one without reheaters or: a. Starting motors b. Shafts c. Compressors d. Combustors e. Regenerators Answer: ...

With all other factors being equal, a counter-flow cooling tower _____________ as a cross-flow cooling tower.

With all other factors being equal, a counter-flow cooling tower _____________ as a cross-flow cooling tower. a. Is not as tall b. Has much less...

Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth.

Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth. a. Flora b. Fauna c. Micro-organisms d. Biological e....

The great majority of steam turbine governing systems utilize the

The great majority of steam turbine governing systems utilize the a) hydraulic system principle b) pneumatic system principle c) mechanical centrifugal...

The stationary passages of a reaction turbine are called the:

The stationary passages of a reaction turbine are called the: a. Shaft b. Rotor c. Shroud ring d. Fixed blades e. Diaphragms Answer: ...

Impulse turbines:

Impulse turbines: a. are only used with low pressure steam b. require large thrust bearings c. were invented by Parsons d. have large pressure drops...