Power Engineering MCQ: September 2018

Archive for September 2018

Chain blocks are designed

Chain blocks are designed a) for mainly horizontal use b) with the top hook strongest c) with a very low mechanical advantage d) with the bottom hook...

The maximum % error we should use when calculating the mass of a light object is

The maximum % error we should use when calculating the mass of a light object is a) 3 b) 5 c) 10 d) 15 e) 20 Answer: ...

Prior to hoisting an object it is best to

Prior to hoisting an object it is best to a) know the route required b) know or calculate the mass c) measure its length d) attach at least two slings e)...

WCB Regulations state: Tubular and similar type section scaffolding shall be erected plumb and __________.

WCB Regulations state: Tubular and similar type section scaffolding shall be erected plumb and __________. a) square b) straight c) without braces d)...

A single pole scaffold

A single pole scaffold a) is free standing from the building b) places no load on the building c) is partially supported by the building d) is always...

Platforms should have a __________ edge going around them to prevent objects from rolling off.

Platforms should have a __________ edge going around them to prevent objects from rolling off. a) square b) wire c) metal d) raised e) magnetic ...

Ladders constructed on the job must comply with the

Ladders constructed on the job must comply with the a) WCB suggestions b) ASME codes c) CSA codes d) fire department's by-laws e) WCB regulations...

The top of a ladder should extend approximately __________ above the level of the upper landing to which it provides access.

The top of a ladder should extend approximately __________ above the level of the upper landing to which it provides access. a) 2 metres b) 0.5 metres c)...

A single pole scaffold

A single pole scaffold a) should not be used b) must be constructed of metal only c) is partially supported by a building d) must have supporting...

A scaffold should always be erected

A scaffold should always be erected a) by the user only b) plumb c) by a contractor d) plumb and level e) level Answer: ...

A rung ladder should

A rung ladder should a) never be able to conduct electricity b) not be equipped with rubber feet, only metal ones c) be inclined with a 5:1 slope d)...

When using a step ladder it is best to

When using a step ladder it is best to a) not work higher than the top three rungs b) have a 4:1 slope on the rung side c) have two co-workers hold...

When working on a platform it is important to

When working on a platform it is important to a) always wear a lifeline harness b) ensure it is equipped with a full guard railing c) construct it...

A government agency which covers several aspects of work platforms is the

A government agency which covers several aspects of work platforms is the a) Boilers and Pressure Vessels Branch b) Workers' Compensation Board Accident...

When storing a hacksaw

When storing a hacksaw a) the blade should be removed b) the saw should be stored in a protective sheath c) strain should be removed by loosening...

The point angle of a properly ground drill should be

The point angle of a properly ground drill should be a) 78 degrees b) 35 degrees c) 112 degrees d) 118 degrees e) 121 degrees Answer: ...

Hand taps are usually made in sets of three called

Hand taps are usually made in sets of three called a) SAE, ISO, and metric b) warding, mill, and bastard c) rough, coarse, and fine d) plug, taper,...

The tap drill is always smaller than the tap, to leave sufficient material for the tap to produce ______ per cent of thread.

The tap drill is always smaller than the tap, to leave sufficient material for the tap to produce ______ per cent of thread. a) 25 b) 30 c) 40 d)...

A taper tap is tapered from the end for approximately

A taper tap is tapered from the end for approximately a) 2 threads b) 3 threads c) 4 threads d) 6 threads e) 8 threads Answer: ...

Chalk or ______________ may be used to rub on the surface of rough castings as a marking material.

Chalk or ______________ may be used to rub on the surface of rough castings as a marking material. a) aluminum sulphate b) grinding compound c) paint d)...

The ___________ of the completed job depends largely on the care taken during laying out.

The ___________ of the completed job depends largely on the care taken during laying out. a) time b) accuracy c) cost d) price e) size Answer...

Micrometers are available in a variety of types and are used mainly for the measurement of

Micrometers are available in a variety of types and are used mainly for the measurement of a) length, width, and thickness of the boiler house structure b)...

Whatever the size of a micrometer, the working parts can only move a distance of

Whatever the size of a micrometer, the working parts can only move a distance of a) 30 mm b) 200 mm c) 250 mm d) 300 mm e) 25 mm Answer: ...

A 300 mm tungsten hacksaw blade with a .78 mm teeth pitch is used to cut

A 300 mm tungsten hacksaw blade with a .78 mm teeth pitch is used to cut a) a brass shaft 25 mm diameter b) 38 mm x 39 mm hardwood c) ceramic materials d)...

A screwdriver having a square tip is known as __________ type.

A screwdriver having a square tip is known as __________ type. a) a slot b) an allen c) a robertson d) a phillips e) a jacobson Answer: ...

Flutes are found on

Flutes are found on a) the inside edges of thread dies b) the body of a twist drill bit c) the point of a twist drill bit d) thread taps e) scribers...

A dressing tool is used to

A dressing tool is used to a) square the edges of a grinding wheel b) clean the measuring contact surfaces of a micrometer c) clean the grooves of...

In order to check the trueness of a flat surface, one would use a

In order to check the trueness of a flat surface, one would use a a) Vernier calliper b) hermaphrodite divider c) surface plate d) layout bench e)...

Copper sulphate may be used

Copper sulphate may be used a) as a thread cutting fluid b) for lubricating very fine threads such as those in a micrometer c) for coating tools in...

To measure valve tappet clearances one would most aptly use

To measure valve tappet clearances one would most aptly use a) an inside micrometer b) a thread micrometer c) a depth micrometer d) feeler gauges e)...

The thread pitch of a metric micrometer is

The thread pitch of a metric micrometer is a) 0.5 mm b) 2.5 mm c) 5 mm d) 0.25 mm e) 0.05 mm Answer: ...

A collet is

A collet is a) a type of hole punch b) used to make a square hole in a piece of plate c) the moving part of a micrometer d) a type of face spanner...

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: ...

A file which is always single cut is the

A file which is always single cut is the a) hand file b) mill file c) warding file d) knife file e) pillar file 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...

Damaged tools

Damaged tools a) are best disposed of or properly repaired b) must be used carefully and cautiously if injury is to be prevented c) should be kept...

Relative to plant maintenance, a power engineer should have easy access to

Relative to plant maintenance, a power engineer should have easy access to a) all ASME codes b) the Chief Inspector c) the Workers' Compensation Board...

Heat lost from a building is

Heat lost from a building is a) dependent on the shape of the openings in a building b) is not affected by wind speed c) affected by wind speed d)...

Heat is lost from a building in the following ways:

Heat is lost from a building in the following ways: a) convection, evaporation, and radiation b) infiltration, condensation, and conduction c) evaporation,...

If exhaust fans are used over cooking only

If exhaust fans are used over cooking only a) 10% of the heat gain is used in calculations b) 25% of the heat gain is used in calculations c) 50%...

Electric motors give off _________ while running.

Electric motors give off _________ while running. a) sensible heat b) latent heat c) latent and sensible heat d) no heat to the atmosphere e) solar...

To calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by

To calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by a) 0.8 b) 0.9 c) 1.1 d) 1.2 e) 2.1 Answer: ...

Heat load from people in a room is mostly affected by

Heat load from people in a room is mostly affected by a) the size of the people b) smoking c) the number of people d) the activity of the people e)...

Air ventilation is based on the larger of these two requirements:

Air ventilation is based on the larger of these two requirements: a) solar heat rate and CFM rate per person b) conduction rate per person and solar...

In calculating air infiltration the quickest method is

In calculating air infiltration the quickest method is a) the air change method b) the crack method c) the solar method d) the conduction method e)...

Two methods of calculating air infiltration into a building are

Two methods of calculating air infiltration into a building are a) the crack and solar method b) the air change and solar method c) the crack and...

Conduction heat gains are calculated on the assumption that

Conduction heat gains are calculated on the assumption that a) solar heat varies from hour to hour as sun changes position b) solar heat gains are...

When complete control systems become very complex, which control signal medium is preferred?

When complete control systems become very complex, which control signal medium is preferred? a) Pneumatic b) Electric c) Electronic d) Digital e)...

To control static pressure in the air ducts a differential pressure controller is installed. How does the controller control static pressure?

To control static pressure in the air ducts a differential pressure controller is installed. How does the controller control static pressure? a) By...

To prevent too frequent starting and stopping of the compressor in a cooling system what should be done?

To prevent too frequent starting and stopping of the compressor in a cooling system what should be done? a) Regulate the operation of the compressor...

Dehumidification is achieved by

Dehumidification is achieved by a) absorbing the moisture with a sponge filter b) absorbing moisture with a chemical drying agent c) cooling the air...

A main advantage of steam type humidifiers over pan type humidifiers is that

A main advantage of steam type humidifiers over pan type humidifiers is that a) steam type humidifiers are inexpensive b) there is minimal time lag...

Air conditioning with respect to heating coils is achieved in which of the following ways?

Air conditioning with respect to heating coils is achieved in which of the following ways? a) A combination of tempering control functions b) The...

Which of the following is not a correct method of heat regulation?

Which of the following is not a correct method of heat regulation? a) Direct modulation of the control valve on the steam or hot water to the heating...

In severely cold weather what adjustment must be made to properly preheat the outside air?

In severely cold weather what adjustment must be made to properly preheat the outside air? a) The temperature controller's throttling range must be...

To provide a two position damper, equipped with a fan that provides 100% outdoor air, with a ratio of damper opening what is required?

To provide a two position damper, equipped with a fan that provides 100% outdoor air, with a ratio of damper opening what is required? a) A gradual...

When the outdoor air damper increases the flow of fresh air, which of the following is true?

When the outdoor air damper increases the flow of fresh air, which of the following is true? a) The return air damper throttles up to reduce the volume...

When is the capacity of a heat pipe at a maximum?

When is the capacity of a heat pipe at a maximum? a) When the system is level b) When the evaporator is raised above the horizontal c) When the system...

The fact that the system can be treated against corrosion is an advantage for which system?

The fact that the system can be treated against corrosion is an advantage for which system? a) A run around system b) A heat pipe c) A heat pump d)...

Which of the following is not an advantage for a runaround system?

Which of the following is not an advantage for a runaround system? a) Installation costs are comparatively low. b) The system is readily adaptable...

Cross contamination is a disadvantage for which of the following systems?

Cross contamination is a disadvantage for which of the following systems? a) A runaround system b) A heat pipe c) A heat tube d) A thermal wheel e)...

The system which makes use of a coil installed underground below frost levels is called a

The system which makes use of a coil installed underground below frost levels is called a a) runaround system b) thermal wheel c) heat tube d) heat...

The system which runs as a refrigeration system used for air conditioning purposes in the summer and can be modified to run in reverse in cooler weather is called a

The system which runs as a refrigeration system used for air conditioning purposes in the summer and can be modified to run in reverse in cooler weather...

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

What is the name of the system that consists of two finned tube heat exchangers? a) runaround system b) heat valve c) heat pump d) heat tube e) thermal...

A system consists of two finned tube heat exchangers. Where is the preconditioning coil of this system located?

A system consists of two finned tube heat exchangers. Where is the preconditioning coil of this system located? a) On the suction side of the pump b)...

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

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

The recovery system which employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm (12 in) thick and 1 to 3.7 m (3 to 12 ft) in diameter is called a

The recovery system which employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm (12 in)...

When looking at building function to select a system which of the following factors are considered?

When looking at building function to select a system which of the following factors are considered? i) Physical size of the building ii) Climatic...

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 cost c)...

A system which provides cooling and heating all year round is highly energy efficient but has a high initial cost. The system consists of two separate supply and return piping systems which are connected to separate coils. Which of the following systems fits this description?

A system which provides cooling and heating all year round is highly energy efficient but has a high initial cost. The system consists of two separate...

Which of the following statements about two-pipe arrangements is false?

Which of the following statements about two-pipe arrangements is false? a) The arrangement is the least costly. b) Piping is connected to the boiler...

An induction system gets its name from which property of the system?

An induction system gets its name from which property of the system? a) The way air in the room is circulated b) The type of units in each zone c)...

Which of the following statements about fan coil units makeup air systems is false?

Which of the following statements about fan coil units makeup air systems is false? a) The units include a disposable filter, fan, and heating/cooling...

A system used extensively in hotels and motels due to its minimal space requirement, relatively low initial cost, and high degree of individual zone control is called

A system used extensively in hotels and motels due to its minimal space requirement, relatively low initial cost, and high degree of individual zone...

In a constant air volume system with perimeter heating which of the following elements are fluids in the air handling unit?

In a constant air volume system with perimeter heating which of the following elements are fluids in the air handling unit? i) Heating coils ii) Cooling...

Supplementary units located in each zone provide

Supplementary units located in each zone provide a) ventilation b) humidity control c) air circulation d) heating e) filtering Answer: ...

Which of the following statements about multi zone systems is true?

Which of the following statements about multi zone systems is true? a) The cooling coils are installed in-line b) The dampers are out of phase by...

The most common system installed in most residences where the furnace is located in the basement and provides conditioned air via ducts to each room is called

The most common system installed in most residences where the furnace is located in the basement and provides conditioned air via ducts to each room...

Which of the following statements about central air conditioning systems is false?

Which of the following statements about central air conditioning systems is false? a) Central systems are used in large buildings. b) All the major...

Which of the following statements about the unit ventilators is false?

Which of the following statements about the unit ventilators is false? a) The units are used in areas with limited available floor space b) The units...

The unitary air conditioning system which uses a direct expansion refrigeration system to provide cooling and dehumidification in a local area without ductwork is called

The unitary air conditioning system which uses a direct expansion refrigeration system to provide cooling and dehumidification in a local area without...

The intake section arrangement which draws in room air, conditions it, and then returns it into the room is called

The intake section arrangement which draws in room air, conditions it, and then returns it into the room is called a) fixed percentage outdoor air...

Which of the following statements about air handling units is true?

Which of the following statements about air handling units is true? a) In any system the air is mainly conditioned in the units b) The units can only...

A small residence located in a tropical climate may require which of the following elements of an air conditioning system:

A small residence located in a tropical climate may require which of the following elements of an air conditioning system: i) heating ii) cooling iii)...

To offset the heat gain through the building's exterior shell from solar radiation, the atmosphere surrounding the building, and from internal sources of heat, what is required?

To offset the heat gain through the building's exterior shell from solar radiation, the atmosphere surrounding the building, and from internal sources...

The category of air conditioning which is responsible for getting outside air into the building to replenish the oxygen supply for the occupants is

The category of air conditioning which is responsible for getting outside air into the building to replenish the oxygen supply for the occupants is a)...

Steam grid humidifiers used in air conditioning systems achieve humidification by

Steam grid humidifiers used in air conditioning systems achieve humidification by a) the installation of a steam coil in the entering air stream b)...

Which is not a method employed to maintain the desired temperature of the spray water in air washers used in air conditioning systems?

Which is not a method employed to maintain the desired temperature of the spray water in air washers used in air conditioning systems? a) an electric...

Air washers used in air conditioning systems achieve cooling and dehumidification by

Air washers used in air conditioning systems achieve cooling and dehumidification by a) heating the spray water to a temperature above the dry bulb...

Air washers used in air conditioning systems achieve heating and humidification by

Air washers used in air conditioning systems achieve heating and humidification by a) cooling the spray water to a temperature below the dew point...

Air washers used in air conditioning systems

Air washers used in air conditioning systems a) only clean the air b) only clean and cool the air c) only humidify and dehumidify the air d) humidify,...

A disadvantage of the atomizing humidifier is

A disadvantage of the atomizing humidifier is a) it has a lower humidification rate than the pan type humidifier b) its evaporation plates clog up...

Atomizing humidifiers

Atomizing humidifiers a) break up the water for humidification into small particles by either a spinning disc or spray nozzle and are placed either...

Wetted element humidifiers

Wetted element humidifiers a) are the same as pan type humidifiers b) can be either the power type or the bypass type c) have stationary plates placed...

Pan type humidifiers with plates

Pan type humidifiers with plates a) consist of rotating plates in a pan partially filled with water b) are placed in individual rooms to humidify...

The types of humidifiers used for residential purposes are

The types of humidifiers used for residential purposes are a) air washers, wetted element, and atomizing b) pan, atomizing, and air washers c) pan,...

Humidifying units which use a small fan to draw warmer air from the furnace plenum or from the room, force the air through the wetted pad, and return the air to the room, are called

Humidifying units which use a small fan to draw warmer air from the furnace plenum or from the room, force the air through the wetted pad, and return...

It is not recommended to use an on-off switch for steam grid humidifiers because

It is not recommended to use an on-off switch for steam grid humidifiers because a) fogging would occur b) overheating would occur c) misting would...

Dehumidification occurs in an Air washer when which of the following occurs?

Dehumidification occurs in an Air washer when which of the following occurs? a) If the level in the bottom tank drops lower than the minimum level b)...

To keep humidifiers in top condition the plates of plate type units should be cleaned by soaking them in a slightly acidic solution and then washing them in soapy water to

To keep humidifiers in top condition the plates of plate type units should be cleaned by soaking them in a slightly acidic solution and then washing...

Which of the following statements about Air washers is false?

Which of the following statements about Air washers is false? a) Air washers can cool air. b) Air washers can remove tobacco smoke. c) Air washers...

Which type of humidifier breaks water up into a mist or fog?

Which type of humidifier breaks water up into a mist or fog? a) A bypass humidifier b) A welted element humidifier c) An atomizing humidifier d) An...

The residential humidifier which is commonly used in the supply plenum of smaller warm air furnaces and consists of a shallow tray partially filled with water is called a

The residential humidifier which is commonly used in the supply plenum of smaller warm air furnaces and consists of a shallow tray partially filled...

Humidification in residences equipped with ducted warm air heating systems

Humidification in residences equipped with ducted warm air heating systems a) is not necessary because the humidity does not change with heating b)...

Relative humidity

Relative humidity a) increases when the air temperature is raised without the addition of moisture to the air b) remains the same when the air temperature...

The purpose of humidification is to

The purpose of humidification is to a) add humidity to the air during the cooling season b) add humidity to the air during the heating season c) remove...

Relative humidity is the amount of

Relative humidity is the amount of a) moisture contained in the air compared to the maximum amount of moisture the air is capable of holding at the...

Humidity in the air

Humidity in the air a) increases when the air temperature decreases b) increases when the air pressure decreases c) decreases when the air pressure...

The outside temperature 18 - 25 degrees C is saturated (Air at -25 degrees C holds a maximum of 0.0005 kg of moisture/kg of water). This air is drawn into the building and heated to 21 degrees C (air at 21 degrees C holds a maximum of 0.015 kg of moisture/kg of water). What is the relative humidity of the air inside?

The outside temperature 18 - 25 degrees C is saturated (Air at -25 degrees C holds a maximum of 0.0005 kg of moisture/kg of water). This air is drawn...

If air at 13 degrees C can hold a maximum of 0.0032 kg of moisture per kilogram of air, what is the relative humidity if the air contains 0.0015 kg of moisture per 1 kg of air?

If air at 13 degrees C can hold a maximum of 0.0032 kg of moisture per kilogram of air, what is the relative humidity if the air contains 0.0015 kg...

Which of the following is not a result of very low humidity?

Which of the following is not a result of very low humidity? a) Throat and nose membranes drying up b) Static electricity build-up c) Evaporation...

Air vents are

Air vents are a) not required when an inverted bucket steam trap is used b) not required on the steam mains if an inverted bucket steam trap is used...

A modulating control valve

A modulating control valve a) can be oversized b) is used for steam coils where the condensate is lifted to an overhead return c) is used for steam...

The inverted bucket steam trap is

The inverted bucket steam trap is a) used when the coil steam pressure is higher than 172 kpa or 25 psig b) used when the flow is modulated c) used...

Which of the following steam traps are preferred for use with steam coils operating at low and medium steam pressure?

Which of the following steam traps are preferred for use with steam coils operating at low and medium steam pressure? a) inverted bucket b) dynamic c)...

Steam coils

Steam coils a) should be installed with tubes in a vertical position to ensure positive condensate drainage b) when installed in the horizontal position,...

Steam coil piping and trapping

Steam coil piping and trapping a) is the same as for hot water and glycol coils b) only handles steam and non-condensable gases c) differs from the...

Which of the following is not an installation recommendation for steam traps?

Which of the following is not an installation recommendation for steam traps? a) Base steam trap selection or the pressure difference across the trap...

The greatest fears in hot water coil installations handling subfreezing air are:

The greatest fears in hot water coil installations handling subfreezing air are: i) pipe expansivity ii) outside air temperature being too low iii)...

Which of the following statements about vacuum breakers is false?

Which of the following statements about vacuum breakers is false? a) They are used to prevent freeze-ups caused by negative pressure in the coil. b)...

A thermostat which is sometimes installed in the return air duct serves which main function?

A thermostat which is sometimes installed in the return air duct serves which main function? a) To limit temperature of the heated outside air b)...

Glycol coils using ethylene glycol

Glycol coils using ethylene glycol a) give reasonable heat transfer efficiency at low glycol velocity b) are not recommended for use in heating and...

Ethylene glycol used in glycol coils

Ethylene glycol used in glycol coils a) has a higher heat transfer efficiency than hot water b) has less friction losses in the coil and piping than...

For a glycol system using hot water as its heat source which of the following statements is false?

For a glycol system using hot water as its heat source which of the following statements is false? a) Valve V-3 will be opened to feed a constant...

The use of ethylene glycol solution will result in which of the following:

The use of ethylene glycol solution will result in which of the following: i) Lower heat transfer rate ii) Better protection against freezing iii)...

The flow arrangement best suited for hot water coils is

The flow arrangement best suited for hot water coils is a) the counterflow arrangement because it is more efficient b) the parallel flow arrangement...

The purpose of the flow switch or sail switch used with hot water coils is to

The purpose of the flow switch or sail switch used with hot water coils is to a) stop the fan and close the outside air dampers if the low limit temperature...

The purpose of the "freeze-stat" temperature controller used with hot water coils is to

The purpose of the "freeze-stat" temperature controller used with hot water coils is to a) close the outside air dampers and stop the fan if the heat...

Which of the following is not a cause of freezing in hot water coils?

Which of the following is not a cause of freezing in hot water coils? a) failure of the circulating pump b) very low circulating water velocity c)...

In a hot water coil which of the following is not included for providing a good guideline for the correct application of the system with minimal possibility of freeze-up?

In a hot water coil which of the following is not included for providing a good guideline for the correct application of the system with minimal possibility...

The purpose of a vacuum breaker used with steam coils is to

The purpose of a vacuum breaker used with steam coils is to a) ensure positive air pressure in the conditioned space b) ensure negative air pressure...

It is good design practice to select a steam coil size

It is good design practice to select a steam coil size a) so that 100% of the coil capacity is needed when the air temperature entering the coil is...

To prevent freezing of the steam coil when steam pressure at the coil inlet is too low or is lost

To prevent freezing of the steam coil when steam pressure at the coil inlet is too low or is lost a) a second preheat coil is installed at the outside...

Freezing problems in steam coils with long tube lengths, handling a large amount of low temperature outside air

Freezing problems in steam coils with long tube lengths, handling a large amount of low temperature outside air a) are minimized by using preheat...

Steam coils with long tube lengths

Steam coils with long tube lengths a) have the greatest freezing problems at extremely low temperatures such as -35° C b) have the greatest freezing...

Steam coils with a short tube length of 1.1 m or less

Steam coils with a short tube length of 1.1 m or less a) are more likely to freeze, even if the steam trap is properly chosen b) are not recommended...

It is good practice to select steam coils which require at least 40% of coil capacity when air temperature is 1 degree C for which of the following reasons?

It is good practice to select steam coils which require at least 40% of coil capacity when air temperature is 1 degree C for which of the following...

To prevent freezing of downstream equipment in a coil handling a large amount of outdoor air, which of the following is required?

To prevent freezing of downstream equipment in a coil handling a large amount of outdoor air, which of the following is required? a) A long coil...

Face velocity is the

Face velocity is the a) velocity of the supply water to the coil b) velocity of the air before it enters the coil c) velocity of the air after it...

Rippled-finned surface type coils

Rippled-finned surface type coils a) are often used for low temperature application where ice may form b) decrease the heat transfer efficiency c)...

Flat-finned surface type coils are normally used for

Flat-finned surface type coils are normally used for a) steam heating purposes b) water heating purposes c) high temperature application d) low temperature...

Two types of modern coils used for heating and cooling services in air handling systems are

Two types of modern coils used for heating and cooling services in air handling systems are a) the continuous-plate finned surface and the spiral...

Fin surface area is called

Fin surface area is called a) primary surface area b) secondary surface area c) tube surface area d) heater surface area e) none of the above ...

Finned tube coils in air handling systems are often called

Finned tube coils in air handling systems are often called a) fish coils b) bare tube coils c) extended surface coils d) cooling coils e) heating...

Which of the following is a limiting factor for the number of fins that can be used?

Which of the following is a limiting factor for the number of fins that can be used? a) Temperature of steam in coils b) Temperature of chilled water...

To ensure effective heat transfer which of the following is the most vital element?

To ensure effective heat transfer which of the following is the most vital element? a) The fin must be crimped b) Highly conductive material used...

Which of the following statements about coil surfaces is false?

Which of the following statements about coil surfaces is false? a) Air flows across the fins b) Finned coils are more compact than smooth tube coils...

Which one of the following methods is not a method of ensuring uniform steam distribution in steam coils?

Which one of the following methods is not a method of ensuring uniform steam distribution in steam coils? a) installation of distributing plates within...

To assure proper air venting, the

To assure proper air venting, the a) return water connection should be at the bottom of the coil b) supply water connection should be at the bottom...

Half serpentine water coil circuiting is used

Half serpentine water coil circuiting is used a) in applications requiring high water velocities and low water pressure drops b) where the water velocity...

Double serpentine water coil circuiting is used

Double serpentine water coil circuiting is used a) where the water velocity in the tubes is less than 0.3 m/s b) where the water velocity in the tubes...

Single serpentine water coil circuiting is used

Single serpentine water coil circuiting is used a) where the water velocity in the tubes is less than 0.3 m/s b) where the water velocity in the tubes...

The most commonly used types of water coil circuiting are

The most commonly used types of water coil circuiting are a) single serpentine, double serpentine, and half serpentine b) full circuit, double circuit,...

With counterflow arrangement of air and water

With counterflow arrangement of air and water a) the water supply connection is on the same side as the entering air b) it decreases the heat transfer...

Proper performance of heating and cooling water coils depends on

Proper performance of heating and cooling water coils depends on a) adequate air velocity over the finned surface b) counterflow arrangement of air...

A factor limiting the number of fins that can be used on coils is

A factor limiting the number of fins that can be used on coils is a) the diameter of the tube b) the temperature of the fluid in the tube c) the material...

Which of the following statements about water coils is false?

Which of the following statements about water coils is false? a) Coils should be hooked up in a counterflow arrangement. b) Coils need to be able...

Fin spacing of 6.35 to 1.814 mm is most normally used in which of the following cases?

Fin spacing of 6.35 to 1.814 mm is most normally used in which of the following cases? a) Direct expansion coils for low temperature applications b)...

To obtain full rated capacity of water coils what should be done?

To obtain full rated capacity of water coils what should be done? a) Connect the water supply for counterflow b) Connect the water supply for parallel...

Which of the following statements about steam distributing coils is true?

Which of the following statements about steam distributing coils is true? a) The coils never freeze b) The coils distribute steam evenly over the...

In order to provide uniform steam distribution to the individual tubes, which of the above design parameters is/are true?

Steam Coils must be designed to: i) constantly eliminate air ii) constantly eliminate condensate iii) constantly eliminate noncondensable gases iv) constantly...

Air venting is required for which of the following reasons?

Air venting is required for which of the following reasons? a) To assure adequate water distribution in supply and return lines b) To assure adequate...

Which type of coil circuiting is designed to produce a high heat capacity with a limited water quantity?

Which type of coil circuiting is designed to produce a high heat capacity with a limited water quantity? a) Single serpentine b) Double serpentine c)...

The function of a check valve is similar to the function of which type of damper?

The function of a check valve is similar to the function of which type of damper? a) A manual damper b) A modulating damper c) A two-position damper d)...

A mixing box is an example of which kind of damper?

A mixing box is an example of which kind of damper? a) A manual damper b) A modulating damper c) A two-position damper d) A relief damper e) A louver...

Functions of terminal air distribution devices are accomplished

Functions of terminal air distribution devices are accomplished a) only by diffusion b) only by diffusion and aspiration c) by aspiration, entrainment,...

Which of the following is not a function of terminal air distribution devices?

Which of the following is not a function of terminal air distribution devices? a) provide uniform space temperatures b) provide adequate air motion...

Which of the following is NOT a function of terminal air distribution devices?

Which of the following is NOT a function of terminal air distribution devices? a) Distribute the air to the spaces b) Provide uniform space temperatures c)...

Air louvers

Air louvers a) are often used for mixing boxes b) are always used for fire and smoke dampers c) are suited for two position damper operation d) are...

Parallel blade dampers

Parallel blade dampers a) are used only in small sizes with low velocity air b) are used when modulation of air flow is required c) have blades linked...

Damper designs include

Damper designs include a) only parallel blade types b) only single blade types c) opposed blade, parallel blade, and single blade types d) only opposed...

Relief dampers

Relief dampers a) allow air flow in both directions b) allow air flow in one direction only c) allow air mixing d) are the same as bypass dampers e)...

Modulating dampers in air handling systems are used

Modulating dampers in air handling systems are used a) as mixing boxes to proportion the amounts of two different air flows such as outdoor air and...

Dampers in air handling systems

Dampers in air handling systems a) may only be manual and modulating b) may only be modulating c) may be modulating, manual, or two position d) may...

The purpose of dampers in an air handling system is

The purpose of dampers in an air handling system is a) to control the flow of air b) to regulate refrigeration compressor speed c) to control the...

The function of a check valve is similar to the function of which type of damper?

The function of a check valve is similar to the function of which type of damper? a) A manual damper b) A modulating damper c) A two-position damper d)...

A mixing box is an example of which kind of damper?

A mixing box is an example of which kind of damper? a) A manual damper b) A modulating damper c) A two-position damper d) A relief damper e) A louver...

Duct liners

Duct liners a) eliminate corrosion b) reduce the noise level of air flowing in the duct system c) reduce fire hazard d) increase erosion to the duct e)...

Return air duct leakage calculations include

Return air duct leakage calculations include a) 3% seepage if the return air duct is outside the conditioned space b) 3% seepage if the return air...

Supply air duct leakage loss calculations include

Supply air duct leakage loss calculations include a) 20% leakage loss when all the supply air duct is outside the conditioned space b) losses from...

Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly

Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly a) restrict spread of smoke b) insulate c) act as fire...

When all supply air duct is outside the conditioned space there is a certain leakage. This leakage must be calculated how?

When all supply air duct is outside the conditioned space there is a certain leakage. This leakage must be calculated how? a) It must be added to...

Seepage in return air ducts turned within the conditioned space may have what kind of effect?

Seepage in return air ducts turned within the conditioned space may have what kind of effect? a) It will add to the amount of air needed to supply...

Which of the following statements about duct leakage losses is true?

Which of the following statements about duct leakage losses is true? a) The effects of air leakage in supply air ducts are the same as those in return...

Ducts are fabricated of

Ducts are fabricated of a) sheet metal b) cement asbestos c) plastic d) fibreglass e) all of the above Answer: ...

Materials used in sheet metal ducts are

Materials used in sheet metal ducts are a) only copper b) only aluminum c) only stainless steel d) galvanized or black steel, aluminum, copper, and...

Fibreglass ducts are used

Fibreglass ducts are used a) in high pressure systems b) to handle air with high moisture levels or oil and grease c) where its heavy weight is not...

Medium and high pressure duct systems require less space than low pressure duct systems, but this feature is partly offset by

Medium and high pressure duct systems require less space than low pressure duct systems, but this feature is partly offset by a) higher operating...