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Quiz Unit 22 & 27 > Quiz Unit 22 & 27 > Flashcards

Quiz Unit 22 & 27 Flashcards

1
Q

Removing air from a hot water heating system can be achieved with the aid of a/an

A) Expansion tank
B) Balancing valve
C) Diverter
D) Auto-fill valve
E) Dip tube
A

A) Expansion tank

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2
Q

Which of the following is not considered direct heating

A) in-duct make-up heaters
B) unit ventilators
C) radiant panel heater
D) baseboard heaters

A

A) in-duct make-up heaters

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3
Q

A pressure balancing device that prevents the boiler pressure from forcing the water in the boiler into
the return lines is called a:

A) Relief valve
B) Pipe siphon
C) Hartford loop
D) Check valve
E) Pressure reducing valve
A

C) Hartford loop

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4
Q

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

A) a water closet
B) a sink
C) a storm drain
D) a sewer
E) a sump pump
A

A) a water closet

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5
Q

Plugged __________ on warm air heating and ventilating systems limit the air flow and result in
insufficient heating and a waste of fuel.

A) Convectors
B) Univents
C) Filters
D) Drain lines
E) Diverters
A

C) Filters

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6
Q

Which one of the following steam heating systems can be used to overcome the difficulty of returning
condensate back to the boiler due to inefficient static head?

A) One pipe, gravity return system
B) Two pipe, free drain return system
C) Two pipe, gravity return system
D) One pipe, free flow return system
E) Two pipe, return trap system
A

E) Two pipe, return trap system

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7
Q

The most common type of filters used in air conditioning systems are

A) Rotating filters
B) Viscous Impingement filters
C) Dry filters
D) Bag filters

A

B) Viscous Impingement filters

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8
Q

When the maximum building demand for water is always less than the maximum flow available from a
municipal or local distribution system which of the following systems can be used?

A) A tankless constant pressure system
B) A gravity system
C) A down feed system
D) A constant pressure system with suction tank
E) A constant pressure system with pneumatic tank

A

A) A tankless constant pressure system

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9
Q

The back flow prevention method which consists of two independently acting check valves with an
automatic operating pressure differential relief valve located between the two check valves is called:

A) PVB
B) Reduced pressure principle device
C) Air gap back flow prevention
D) Double check valve
E) Atmosphere vacuum breaker
A

B) Reduced pressure principle device

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10
Q

A backflow device is used to prevent

A) water flow to reverse through the radiator/convector
B) boiler water from entering the water supply
C) water flow to reverse within the boiler
D) the expansion tank from filling
E) boiler water from entering the water supply

A

B) boiler water from entering the water supply

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11
Q

In a gravity return system, the boiler should be placed:

A) On an elevated platform
B) Well below the lowest radiator
C) Well above the highest radiator
D) At the same level as the radiators
E) In a central location
A

B) Well below the lowest radiator

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12
Q

The pressure safety relief valve frequently opening is an indication that

A) the backflow preventer is not operating properly
B) the auto-fill valve is not providing make-up water
C) there is no system demand
D) the circulator has failed
E) the expansion tank has lost its air cushion

A

E) the expansion tank has lost its air cushion

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13
Q

Rooms that are stuffy and dry are created by

A) too much ventilation air
B) lack of ventilation
C) a low supply air temperature
D) poor air distribution
E) poorly insulated ducts
A

B) lack of ventilation

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14
Q

Which of the following is not an appropriate heater to use in a small shop/garage environment

A) Quartz lamp
B) Low Temperature Catalytic heater
C) Surface Combustion heater
D) Horizontally Internally Fired radiant heater

A

c) Surface Combustion heater***

Low Temperature Catalytic heater**

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15
Q

The blower in a furnace is always located

A) after the burner and heat exchanger
B) before the burner and heat exchanger
C) between the burner and heat exchanger
D) before the filter

A

B) before the burner and heat exchanger***

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16
Q

Unit ventilators use:

A) Natural draft
B) Only inside air for heating
C) Only outside air for heating
D) Fin coil heaters
E) A mixture of inside and outside air for heating
A

E) A mixture of inside and outside air for heating

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17
Q

The perimeter loop system of furnace ducting is ideal for a building with

A) No insulation in the walls
B) no basement
C) low headroom in the basement
D) no cold air returns
E) concrete walls
A

B) no basement

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18
Q

Slow or insufficient heat in one or more rooms in a steam, heated building can be caused by a faulty:

A) Float switch
B) Sight glass
C) Vacuum switch
D) Heater
E) Steam trap
A

E) Steam trap

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19
Q

Direct lighting systems:

A) Have greater glare control
B) Are more energy efficient than indirect lighting
C) Produce shadow free light
D) Have a higher initial cost than indirect lighting
E) Blend with the environment

A

B) Are more energy efficient than indirect lighting

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20
Q

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:

Question 20 options:
A) Dry return
B) Upfeed return
C) Wet return
D) Downfeed return
E) Flooded return
A

C) Wet return

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21
Q

The outlet flue gas temperature of a high efficiency furnace is

A) 65�C
B) 230�C
C) 35�C
D) 130�C

A

A) 65�C

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22
Q

Ambient lighting can be improved by using two types of lighting:

A) Natural and artificial
B) Direct and indirect
C) Reflective and refractive
D) Florescent and incandescent
E) General and local
A

B) Direct and indirect

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23
Q

Activated carbon filters are used to remove

A) particles smaller than 0.3 microns
B) odours and irritant contaminants
C) bacterial and mould spores
D) odours and other objectionable vapours

A

D) odours and other objectionable vapours

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24
Q

Corrugations in outside aluminium sheet metal conductors is required for which of the following
reasons?

A) To increase the flow speed of storm water
B) To eliminate corrosion
C) To decrease potential for blockage
D) To allow water to flow if there is scale build up
E) To permit expansion

A

E) To permit expansion

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25
Q

The removal of SO2 and Cl2 contaminants is best accomplished using

A) HEPA filters
B) activated carbon
C) Air sterilizers
D) activated alumina chemisorbant

A

D) activated alumina chemisorbant

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26
Q

The blow off valve in a storage heater is used to:

A) Monitor unsafe temperatures
B) Release steam should the heater malfunction to avoid flashing of steam in the fixtures
C) Eliminate pressure build up in the heater
D) Shut off the flow of gas if the flame and pilot light are extinguished
E) Remove sediment carried to the heater through the water line

A

E) Remove sediment carried to the heater through the water line

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27
Q

The minimum pressure in a hydronic system should be

A) 12 kPa at the lowest point of the system
B) 206 kPa at the boiler
C) 83 kPa at the highest point of the system
D) 12 kPa at the highest point of the system
E) 12 kPa at the boiler

A

C) 83 kPa at the highest point of the system

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28
Q

In a circulating hot water system the municipal distribution systems and/or local storage tanks are used
for which of the following reasons.

A) Both cold water and heater water supply
B) Water meter rationing
C) Cold water supply only
D) Hot water supply from municipal heating stations
E) Water supply to heaters only

A

E) Water supply to heaters only

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29
Q

Infrared heaters are able to provide spot heating with the aid of a fitted

A) vent
B) reflector
C) blower
D) burner

A

B) reflector

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30
Q

Air can be removed from steam heating systems by:

A) An air header
B) Air vents
C) An air separator
D) A dip tube
E) A steam trap
A

B) Air vents

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31
Q

The warm air outlets in a warm air heating system should always be located along the

A) inside walls of the rooms at or near the floor level and preferably under the windows
B) Top corners of the rooms and preferably away from the windows
C) outside walls of the rooms on or near the ceiling and preferably above the windows
D) outside walls of the rooms at or near the floor level and preferably under the windows
E) inside walls of the rooms on or near the ceiling and preferably above the windows

A

d) outside walls of the rooms at or near the floor level and preferably under the windows

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32
Q

The point of no pressure change is determined by the location of the

A) Boiler
B) Circulating Pump
C) Expansion tank
D) Auto-fill valve
E) Convectors
A

C) Expansion tank

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33
Q

What is the most suitable form of heating for a large warehouse

A) a single large roof top unit
B) a series of unit heaters
C) a series of radiant panels
D) a single large furnace

A

B) a series of unit heaters

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34
Q

In a circulating hot water system automatic air vents serve which of the following functions?

A) They are required for adequate water aeration
B) They cool the water in the storage tank to increase the temperature differential to increase
circulation
C) They provide a source of fresh air for ventilation
D) They remove air that is released when water is heated
E) They supply air to cooling water in the storage tank

A

D) They remove air that is released when water is heated

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35
Q

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

A) Sight glass
B) Pressure reducing valve
C) Gate valve
D) Float switch
E) Drain valve
A

D) Float switch

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36
Q

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

A) 80%
B) 75%
C) 65%
D) 60%
E) 70%
A

D) 60%

37
Q

The first convector fed is the first to return to the boiler is indicative of a:

A) Multi-zone system
B) Series Loop system
C) Two-pipe reverse return system
D) Two-pipe direct return system
E) One-pipe system
A

D) Two-pipe direct return system

38
Q

A luminaire is a

A) Type of light refractor
B) Lamp ballast
C) Type of lamp
D) Type of light reflector
E) Complete lighting unit
A

E) Complete lighting unit

39
Q

When control for multiple locations is required:

A) Changes are simple and economical
B) The wiring does not require conduits
C) A combination of two 3-way switches and two 4-way switches are used
D) Three or more one-way switches are used
E) A 4-way switch is used

A

C) A combination of two 3-way switches and two 4-way switches are used

40
Q

The system best suited to provide heating to different temperatures based on occupancy requirements
is the

A) Series Loop system
B) Two-pipe reverse return system
C) Two-pipe direct return system
D) Multi-zone system
E) One-pipe system
A

D) Multi-zone system

41
Q

Fin-coiled heat exchangers are indicative of

A) roof top units
B) electric resistance coils system
C) directly fired space heaters
D) hydronic system

A

C) directly fired space heaters***

hydronic systems

42
Q

Air filters can be divided into two groups

A) mechanical and air sterilizers
B) mechanical and electronic
C) dry and wet
D) mechanical and rotating drum
E) Electronic and steam
A

B) mechanical and electronic

43
Q

Which of the following statements about a constant pressure system with a pneumatic tank is false?

A) A system controller automatically starts a standby pump in the event of pump failure
B) Air must continuously be introduced into the tank
C) Water entering directly into the pump suction is discharged into a pressurised tank
D) This system is primarily used in larger buildings
E) The system has a pressure regulator to maintain a relatively constant pressure above the
water level inside the tank

A

D) This system is primarily used in larger buildings

44
Q

The sealed ball bearings used on a blower in the warm air heating systems

A) should be dismantled every two years for maintenance
B) require continuous lubrication
C) require packing with grease annually
D) require no lubrication

A

D) require no lubrication

45
Q

Which of the following statements is true?

A) The stack vent and loop vents allow equalisation of pressure in the system
B) Branch line connections to the waste stack should be connected at an angle of more than
45�C
C) Most buildings have several waste and soil stacks with each stack providing drainage for all the
sections of the building
D) In a multi story building one stack is used for venting and waste disposal
E) The stack vent prevents sewer gas from being vented through the roof

A

A) The stack vent and loop vents allow equalisation of pressure in the system

46
Q

In a Series Loop system

A) Balancing the hot water flow through each radiator/convector is critical
B) Heat distribution from each radiator/convector is the same
C) Isolating one radiator/convector isolates all the radiators/convectors
D) Radiators/convectors can be isolated individually
E) High heating capacities are attainable

A

C) Isolating one radiator/convector isolates all the radiators/convectors

47
Q

The two-pipe reverse return system

A) is poorly suited for multi-storey buildings
B) pipe sizing is critical
C) must have balancing valves at each convector
D) tends to be self balancing
E) has different length supply and return runs

A

D) tends to be self balancing

48
Q

Radiators and convectors should be placed:

A) Against inside walls
B) Closed to the boiler
C) Against outside walls and preferably under windows
D) In an enclosed area and away from windows
E) In a central location

A

C) Against outside walls and preferably under windows

49
Q

Ventilation can be divided into two groups

A) Mechanical and Forced
B) Natural and induced
C) Mechanical and Natural
D) Forced and Induced

A

C) Mechanical and Natural

50
Q

Which of the following is not a type of heating source used in warm air heating systems?

A) Electric-resistance coil
B) Directly fired
C) Fin-coil heat exchanger
D) Infrared

A

D) Infrared

51
Q

A plumbing drain trap should be located within _____ of the fixture.

A) 750 mm
B) 590 mm
C) 350 mm
D) 610 mm

A

D) 610 mm

52
Q

The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a
sudden stop of water flow in a pipe is caused by:

A) Hissing of pipes
B) Creaking of pipes
C) Whistling of faucets
D) Chattering of faucets
E) Water hammer
A

E) Water hammer

53
Q

Very fine particles, smaller than 0.3 microns, are best removed using

A) Dry filters
B) Viscous filters
C) Air washers
D) Electronic air cleaner

A

D) Electronic air cleaner

54
Q

The purpose of the metal fins attached to the copper tubes in a convector is to:

A) Increase the heat transfer
B) Direct the heat
C) Direct the steam flow
D) Increase the steam flow
E) Protect the tubes from damages
A

A) Increase the heat transfer

55
Q

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

A) Ensure negative air pressure in the conditioned space
B) Prevent freezing caused by a vacuum or negative pressure in the steam coil
C) Ensure positive air pressure in the conditioned space
D) Ensure proper operation of the steam control valve
E) Prevent excessive temperatures within the steam coil

A

B) Prevent freezing caused by a vacuum or negative pressure in the steam coil

56
Q

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

A) Poor air venting of the coil
B) Failure of the circulating pump
C) Very high circulating water velocity
D) Very low circulating water velocity
E) Failure of the heat source
A

C) Very high circulating water velocity

57
Q

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

A) Manual damper
B) Modulating damper
C) Two-position damper
D) Relief damper
E) Louver
A

D) Relief damper

58
Q

An average effective temperature chart can be applicable under the following conditions except when:

A) The heating method is hot water
B) The heating method is steam
C) Activity is high or heavy muscular work
D) Customary indoor clothing is worn
E) The heating method is warm air
A

C) Activity is high or heavy muscular work

59
Q

Parallel blade dampers:

A) Are often used on mixing boxes where two sets of dampers are mounted with the blades
directing the air flow
B) Are not suited for two position damper operation
C) Have blades linked so adjacent blades rotate in opposite directions
D) Are used only in small sizes with low velocity air
E) Are used when modulation of air flow is required

A

A) Are often used on mixing boxes where two sets of dampers are mounted with the blades

60
Q

Relative humidity is:

A) Equal to the dry bulb temperature divided by the wet bulb temperature
B) The ratio of the mass of water vapour divided by the mass of dry air
C) The ratio of water vapour in the air compared to the total amount water vapour the air could
contain at a given temperature
D) The ratio of the mass of water vapour divided by the mass of wet air
E) Equal to the wet bulb temperature divided by the dry bulb temperature

A

C) The ratio of water vapour in the air compared to the total amount water vapour the air could
contain at a given temperature

61
Q

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

A) Temperature of chilled water in the coils
B) Fin material
C) Face velocity
D) Resistance to air flow
E) Temperature of steam in the coils
A

D) Resistance to air flow

62
Q

Wetted element humidifiers:

A) Have a lower humidification rate than the pan type humidifiers
B) Have stationary plates placed in a tray and placed in individual rooms
C) Can be either the power type or the bypass type
D) Are the same as pan type humidifiers
E) Are the same as the atomising humidifier

A

C) Can be either the power type or the bypass type

63
Q

Wetted element humidifiers:

A) Have a lower humidification rate than the pan type humidifiers
B) Have stationary plates placed in a tray and placed in individual rooms
C) Can be either the power type or the bypass type
D) Are the same as pan type humidifiers
E) Are the same as the atomising humidifier

A

C) Can be either the power type or the bypass type

64
Q

The relative humidity is plotted on a psychrometric chart along the:

A) Saturation line and plotted along the horizontal lines
B) Horizontal axis on the bottom of the chart
C) Vertical lines and read along the horizontal scale at the bottom of the chart
D) Horizontal lines and read along the left side scale
E) Lines curved upwards from the lower left to the upper right side of the chart

A

E) Lines curved upwards from the lower left to the upper right side of the chart

65
Q

Which of the following is not a centrifugal fan?

A) Forward inclined fan
B) Radial blade fan
C) Backward inclined fan
D) Backward inclined airfoil blade fan
E) Propeller fan
A

E) Propeller fan

66
Q

The comfort of human beings is affected by the atmospheric conditions that surround them, which of
the following is not an atmospheric condition that affects comfort?

A) Air movement
B) Saturation temperature
C) Temperature
D) Relative humidity
E) Air cleanliness
A

B) Saturation temperature

67
Q 
If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb and leaves
the heating coil at 30°C dry bulb, what is the change in enthalpy?
Question 17 options:
A) 42 kW
B) 65.2 kW
C) 51.7 kW
D) 52 kW
E) 59.4 kW
A

E) 59.4 kW

68
Q

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

A)The coils cannot be used where freezing air temperatures are frequently encountered over the
coil
B) The coils can only have same end connections
C) The coils distribute steam evenly over the entire coil
D) The coils never freeze
E) The coils are used when steam cannot be throttled

A

C) The coils distribute steam evenly over the entire coil

69
Q

Short radius elbows should be provided with what?

A) Stiffeners
B) Positive lock dampers
C) Flexible connections
D) Mitre elbows
E) Turning vanes
A

E) Turning vanes

70
Q

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

A) Float and thermostatic trap
B) Float only
C) Dynamic
D) Thermostatic only
E) Inverted bucket
A

A) Float and thermostatic trap

71
Q

The fan which discharges maximum air delivery at the lowest power requirement and is used mainly to
produce large air movements at low pressures is the:

A) Tube axial fan
B) Backward inclinded blade fan
C) Propeller fan
D) Radial blade fan
E) Forward curved blade fan
A

C) Propeller fan

72
Q

With counter flow arrangement of air and water in a heating coil:

A) The water return connection is on the same side as the leaving air
B) The heat transfer efficiency is the same as with parallel arrangement of air and water
C) The water supply connection is on the same side as the leaving air
D) The water supply connection is on the same side as the entering air
E) It decreases the heat transfer efficiency

A

C) The water supply connection is on the same side as the leaving air

73
Q

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

A) To stop leakage in the seams of the duct work
B) To act as a fire retardant
C) To attenuate airborne noises
D) To restrict spread of smoke
E) To insulate
A

C) To attenuate airborne noises

74
Q

Which of the following statements about air washers is false?

A) Air washers can cool air
B) Air washers can heat air
C) Air washers can remove tobacco smoke
D) Air washers can dehumidify air
E) Air washers can clean air
A

C) Air washers can remove tobacco smoke

75
Q

The main function of an air conditioning duct system is to:

A) Only transmit air to the refrigeration compressor
B) Transmit supply and return air between the air handling apparatus and the space to be
conditioned
C) Only transmit supply air from the air handling apparatus
D) Transmit air form the refrigeration compressor to the condenser
E) Only transmit return air from the space to be conditioned

A

B) Transmit supply and return air between the air handling apparatus and the space to be
conditioned

76
Q

A) Have freezing problems at any temperature
B) Are not likely to freeze at any temperature
C) Have the greatest freezing problems at temperatures of about -2°C to -1°C
D) Have the greatest freezing problems at extremely low temperatures such as -35°C
E) Are less likely to freeze than steam coils with short tube lengths

A

C) Have the greatest freezing problems at temperatures of about -2°C to -1°C

77
Q

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

A) Aspirating psychrometer
B) Dry psychrometer
C) Thermostat
D) Sling psychrometer
E) Hydrometer
A

A) Aspirating psychrometer

78
Q

Axial flow fans:

A) Have maximum horsepower requirements at maximum or free air delivery
B) Are the least economical fans used to produce high capacity, low pressure air movement
C) Have minimum horsepower at maximum or free air delivery
D) Are quieter than centrifugal fans
E) Are not the logical choice to move large volumes of air at low pressures

A

C) Have minimum horsepower at maximum or free air delivery

79
Q

When comparing the tube axial fan with the vane axial fan the main difference between the two is the:

A) Location of the fan bearings
B) Motion of the discharge air
C) Noise output
D) Location of the fans in the system
E) Size of the two units
A

B) Motion of the discharge air

80
Q

The purpose of humidification is to:

A) Remove moisture from the air during the heating season
B) Add humidity to the air during the cooling season
C) Add moisture to the air during the cooling season
D) Add humidity to the air during the heating season
E) Remove moisture from the air during the cooling season

A

) Add humidity to the air during the heating season

81
Q

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

A) 10.60%
B) 3.30%
C) 4.50%
D) 0.50%
E) 0.02%
A

B) 3.30%

82
Q

Face velocity is the:

A) Velocity of the air after it leaves the coil
B) Velocity of the air before it enters the coil
C) Velocity of the return water from the coil
D) Velocity of the supply water to the coil
E) Average velocity of the air flowing over the face area of the fin surface

A

E) Average velocity of the air flowing over the face area of the fin surface

83
Q

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

A) The fan output is increased
B) Provisions are made to stop the fan and close the outdoor air dampers
C) A two-position steam control valve is installed at the coil inlet
D) A modulating steam control valve is installed at the coil inlet
E) A second preheat coil is installed at the outside air inlet

A

B) Provisions are made to stop the fan and close the outdoor air dampers

84
Q

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 the calculated room specific latent humidity load
B) It must be added to the return air duct leakage
C) It must be subtracted from the return air duct leakage
D) It need not be considered in loss calculation
E) It must be added to the calculated room sensible heat load

A

E) It must be added to the calculated room sensible heat load

85
Q

Humidification in residences equipped with ducted warm air heating systems:

A) Is provided for by placing a single humidifier in the furnace plenum or in the warm air duct
B) Requires separate humidifiers for each heated area
C) Is not necessary because the humidity does not change with heating
D) Is supplied sufficiently by normal living processes such as cooking, washing, and breathing
E) Is accomplished by installing a second heating system, such as hot water

A

A) Is provided for by placing a single humidifier in the furnace plenum or in the warm air duct

86
Q

The propeller axial flow fan:

A) Is used in ducted air distribution systems
B) Requires the least power at minimum air deliver
C) Is the least economical fan used to produce high capacity low, pressure air movement
D) Finds application in unit heaters, air-cooled condensers, and as an exhaust fan for ventilation
purposes
E) Is used in commercial air conditioning ducting

A

D) Finds application in unit heaters, air-cooled condensers, and as an exhaust fan for ventilation
purposes

87
Q

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

A) It will create a loss of cooling effect
B) It will ruin the duct�s insulation
C) It will increase the load on the air system in terms of pressure
D) It will add to the amount of air needed to supply the cooled space
E) It will increase the load on the air system in terms of volumes of air

A

E) It will increase the load on the air system in terms of volumes of air

88
Q

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

A) Steam coil
B) Double serpentine
C) Face velocity
D) Single serpentine
E) Half serpentine
A

E) Half serpentine

Quiz Unit 22 & 27 (1 decks)

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