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4 B > Unit11 Building Environmental Systems and Control > Flashcards

Unit11 Building Environmental Systems and Control Flashcards

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1
Q 
A radiator valve is used to control the amount of: 
Select one:
a. Air leaving the radiator. 
b. Condensate leaving the radiator. 
c. Steam leaving the radiator. 
d. Steam entering the radiator.
A

d. Steam entering the radiator.

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2
Q 
Infrared heaters are used in: 
Select one:
a. Theaters 
b. Lecture halls 
c. Libraries 
d. Skating rinks
A

d. Skating rinks

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3
Q

The sealed ball bearings used on a warm air heating system blower:
Select one:
a. Require regular lubrication
b. Require a few drops of oil once or twice a year
c. Should be dismantled every two years for maintenance
d. Require no lubrication

A

d. Require no lubrication

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4
Q

The packless radiator valve has a bronze diaphragm that completely seals off the valve body, to prevent:
Select one:
a. Air from entering the radiator
b. Air leaking out around the valve stem
c. Steam leaking out around the valve stem
d. Differential pressure from changing the valve setting

A

c. Steam leaking out around the valve stem

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5
Q 
Air can be removed from steam heating systems by installing: 
Select one:
a. Air vents 
b. Diverter fittings 
c. Air separators  
d. Dip tubes
A

a. Air vents

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6
Q

Which of the following air handling systems is NOT suitable for providing cooling simultaneously to several distinct locations in a building?
Select one:
a. A roof top unit
b. A dual duct system
c. A high velocity terminal reheat system
d. A multi-zone system

A

a. A roof top unit

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7
Q 
A \_\_\_\_\_\_\_\_ is a fired heater installed where the heat is needed, that heats the air directly without the use of any ducting.
Select one:
a. Unit heater  
b. Unit ventilator 
c. Convector 
d. Rooftop unit
A

a. Unit heater

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8
Q

When air-handling units use hot water heating coils, energy can be saved by:
Select one:
a. Shutting of the hot water circulating pump when the air temperature set point is reached.
b. Switching over to electric heat when the outside air temperature drops excessively.
c. Turning off the supply air fans when the air temperature set point is reached.
d. Adjusting the hot water temperature set point according to the outside air temperature.

A

d. Adjusting the hot water temperature set point according to the outside air temperature.

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9
Q 
The \_\_\_\_\_\_\_\_\_\_\_\_\_\_ is a type of unitary air conditioning system that uses a direct expansion refrigeration system to provide cooling and dehumidification, without using ductwork. 
Select one:
a. Unit ventilator 
b. Rooftop unit 
c. Window air conditioner  
d. Multi-zone system
A

c. Window air conditioner

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10
Q

In unoccupied mode, or “off hours” mode, what is the winter control strategy?

Select one:

a. Fans run normally, OA and EA dampers close, RA damper opens
b. Fans shut down, OA and EA dampers open, RA dampers close
c. Fans shut down, OA and EA dampers close, RA dampers open
d. Fans stay running, OA and EA dampers modulate to minimum, RA dampers modulate to meet OA/EA

A

c. Fans shut down, OA and EA dampers close, RA dampers open

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11
Q

In a radiant heating system, the maximum surface temperature of the walls is:
Select one:
a. 20°C
b. 38°C
c. 45°C
d. limited to 120°C in accordance with ASME IV

A

b. 38°C

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12
Q

One of the advantages of gas-fired infrared heating over other types of heating systems is:
Select one:
a. Gas-fired infrared heaters can heat large volume enclosures with little fuel
b. Gas-fired infrared heaters require no fuel handling equipment
c. Gas-fired infrared heaters can provide effective spot heating
d. Gas-fired infrared heaters can be used as the main heating source for a large building

A

c. Gas-fired infrared heaters can provide effective spot heating

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13
Q

One of the advantages of the radiant panel hot water heating system over the conventional heating system is:
Select one:
a. Radiant panel heating systems require less piping
b. Radiant panel heating systems provide less resistance to water flow
c. Radiant panel systems are lower in cost
d. Radiant heat panels distribute heat more evenly throughout the room

A

d. Radiant heat panels distribute heat more evenly throughout the room

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14
Q

Compared to a steam heating system, if a hot water heating system develops a leak, damage will
Select one:
a. Be greater in the steam system
b. Be greater in the hot water system
c. Be about the same in either system
d. Be minimal due to the automatic drain system

A

b. Be greater in the hot water system

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15
Q 
In hot water heating systems with closed expansion tanks, \_\_\_\_\_\_\_\_\_\_\_ valves automatically fill and pressurize the system.
Select one:
a. Feedwater control 
b. Pressure relief
c. Expansion
d. Pressure reducing
A

d. Pressure reducing

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16
Q

Heat gains by conduction are calculated on the assumption that:
Select one:
a. Solar heat varies from hour to hour as sun changes position
b. Solar heat should be considered separately
c. Construction details are irrelevant
d. The “U” value is not used

A

b. Solar heat should be considered separately

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17
Q 
Sleeve bearings on furnace fans require: 
Select one:
a. No lubrication  
b. Grease every six months 
c. A few drops of oil every six months 
d. Frequent lubrication
A

c. A few drops of oil every six months

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18
Q 
\_\_\_\_\_ are often used to aid the return of condensate through the return piping of large complexes. 
Select one:
a. Boiler feed pumps 
b. Vacuum injectors 
c. Vacuum pumps 
d. Vacuum breakers
A

c. Vacuum pumps

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19
Q 
One of the advantages of forced circulation heating systems, in comparison to gravity heating systems, is:
Select one:
a. Larger pipes can be used 
b. Smaller diameter pipes can be used
c. Lower cost  
d. Reduced energy consumption
A

b. Smaller diameter pipes can be used

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20
Q 
Infrared heaters send out \_\_\_\_\_ heat energy in the form of invisible infrared waves that travel in straight lines through the air. 
Select one:
a. Convective
b. Conductive
c. Radiant  
d. Microwave
A

c. Radiant

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21
Q 
In a fin-coil heat exchanger, the heat exchanger is 
Select one:
a. a steam or hot water coil  
b. Gas-fired 
c. Oil-fired 
d. Direct-fired
A

a. a steam or hot water coil

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22
Q

A common complaint about fan coil units with make-up air is:
Select one:
a. The response is very slow when the system is first turned on.
b. The unit must be shut off when the room is unoccupied.
c. The fan noise is excessive.
d. The system requires too much maintenance.

A

c. The fan noise is excessive.

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23
Q 
In a hot water heating system, air separators should be installed in: 
Select one:
a. horizontal lengths of pipe 
b. vertical pipes
c. expansion tanks
d. hot water converters
A

a. horizontal lengths of pipe

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24
Q

Heat is lost from a building in the following ways:
Select one:
a. Convection, evaporation, and radiation
b. Evaporation, conduction, and radiation
c. Conduction, radiation, and convection
d. Infiltration, evaporation, and convection

A

c. Conduction, radiation, and convection

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25
Q

A low temperature catalytic heater contains a layer of:
Select one:
a. Metal impregnated with a ceramic material
b. Wool fiber impregnated with a catalyst
c. A ceramic mat impregnated with a catalyst
d. Glass wool impregnated with a catalyst

A

d. Glass wool impregnated with a catalyst

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26
Q 
Older radiators were usually made of: 
Select one:
a. Steel 
b. Cast iron  
c. Copper 
d. Brass
A

b. Cast iron

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27
Q

What is the target Relative Humidity (RH) for a building in the summer, when the supply air temperature is 18°C?

Select one:

a. 40 to 60% RH
b. 20 to 30% RH
c. 30 to 50% RH
d. 50 to 70% RH

A

a. 40 to 60% RH

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28
Q

Improper location of the expansion tank in relation to the circulating pump can cause:
Select one:
a. De-pressurization of the expansion tank
b. The pump motor to be overloaded
c. Over-pressurization of the expansion tank
d. Vapour bubbles to form in the circulating pump

A

d. Vapour bubbles to form in the circulating pump

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29
Q 
In a warm air heating system, the cold air return registers are located: 
Select one:
a. In exterior walls 
b. In interior locations 
c. Under windows  
d. In floors
A

b. In interior locations

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30
Q 
The level in the condensate receiver may be automatically controlled by a: 
Select one:
a. Float switch  
b. Pressure reducing valve 
c. Gate valve 
d. Drain valve
A

a. Float switch

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31
Q

The most common residential system, where a furnace provides conditioned air to each room via ducts, is called a:
Select one:
a. Forced air system
b. Single zone, constant air volume system
c. Low velocity terminal re-heat system
d. Multi-zone system

A

a. Forced air system

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32
Q

Which one of the following statements about central air conditioning systems is FALSE?
Select one:
a. Unitary systems can control noise and vibration better than central systems
b. All the major equipment in central systems is located in a central mechanical room in the building.
c. The central system is able to utilize large central equipment with high efficiency and low initial cost.
d. Central systems are used in large buildings.

A

a. Unitary systems can control noise and vibration better than central systems

33
Q 
A heat recovery system consists of two finned tube heat exchangers, connected by a forced circulation system containing heat transfer fluid. Where is the preconditioning coil of this system located? 
Select one:
a. Above the glycol charging station
b. In the return air duct 
c. In the outside air duct 
d. In the exhaust air duct
A

c. In the outside air duct

34
Q 
When air is forced through a heating unit that contains both a fan and a coil, the unit is called: 
Select one:
a. A unit heater  
b. An induction unit 
c. A unit ventilator 
d. A convector
A

a. A unit heater

35
Q 
Infrared heaters are usually mounted: 
Select one:
a. Overhead  
b. At shoulder height 
c. Under windows 
d. Above doorways
A

a. Overhead

36
Q 
The quickest method of calculating air infiltration into a building is the 
Select one:
a. air change method 
b. crack method  
c. solar method 
d. conduction method
A

a. air change method

37
Q

What return air conditions are detected to adjust the amount of fresh admitted into an HVAC system?

Select one:

a. building static pressure and return air temperature
b. CO and CO2
c. CO and O2
d. CO2 and O2

A

b. CO and CO2

38
Q 
Infrared heaters commonly are installed to direct their heat output towards: 
Select one:
a. Ceilings 
b. Windows 
c. Floors  
d. Doors
A

c. Floors

39
Q 
In an internally fired, gas-fired infrared heater, the surface temperature is about: 
Select one:
a. 760°C 
b. 400°C  
c. 900°C 
d. 980°C
A

b. 400°C

40
Q

Furnace heat exchangers should be checked for corrosion because:
Select one:
a. Carbon monoxide could leak into the building
b. Cold air could leak into the building
c. The air will become too dry for comfort
d. Too much air could enter the furnace

A

a. Carbon monoxide could leak into the building

41
Q

An air vent is partially filled with volatile liquid so that:
Select one:
a. When hot steam surrounds cylinder, it causes a needle valve to open.
b. When relatively cool air surrounds the cylinder, it causes a needle valve to open.
c. When relatively cool air surrounds the cylinder, it causes a needle valve to close.
d. The operating mechanism is protected from live steam.

A

b. When relatively cool air surrounds the cylinder, it causes a needle valve to open.

42
Q

What is an indicator of excessively high building static pressure?

Select one:

a. Occupants may get headaches
b. Kitchen and washroom exhaust fans will not ventilate correctly
c. Doors that open to the outside may stay open, or be difficult to close.
d. Doors that open to the outside may be difficult to open.

A

c. Doors that open to the outside may stay open, or be difficult to close.

43
Q 
In an open wire type heating element, the resistance wire is made of: 
Select one:
a. Tungsten 
b. Mica 
c. Steel 
d. Nickel-chromium
A

d. Nickel-chromium

44
Q 
Heat load from people in a room is mostly affected by: 
Select one:
a. The age of the people 
b. The number of people 
c. The activity of the people 
d. The building occupancy class
A

c. The activity of the people

45
Q 
When starting up a steam heating boiler, it should be filled to: 
Select one:
a. The maximum level 
b. Just above the LWCO cut in point 
c. 1/2 of the gauge glass  
d. The bottom of the gauge glass
A

b. Just above the LWCO cut in point

46
Q

Which of the following statements about HVAC induction systems is FALSE?
Select one:
a. The ratio of secondary air to primary air flow is typically 4 to 1.
b. The room thermostat modulates the flow of chilled or hot water to the induction unit coil.
c. Induction systems provide heating, cooling, and humidity control, but cannot supply ventilation air.
d. Induction systems need less room for ductwork, so they are well suited for use in very large buildings with multiple zones.

A

c. Induction systems provide heating, cooling, and humidity control, but cannot supply ventilation air.

47
Q 
The heat recovery system that uses a sealed tube, a capillary wick structure, and a refrigerant liquid, is called a:
Select one:
a. Heat valve
b. Runaround system 
c. Heat pump
d. Heat pipe
A

d. Heat pipe

48
Q

An advantage of a thermal wheel heat recovery system is
Select one:
a. There is no cross contamination of the supply air steam.
b. Sealing arrangements are simple and effective.
c. Piping and pumps are not required.
d. Thermal wheels require very little space.

A

c. Piping and pumps are not required.

49
Q 
Manually operated petcocks for expelling air from heating systems have been superseded by: 
Select one:
a. Steam traps 
b. Diverters 
c. Automatic air vents  
d. Check valves
A

c. Automatic air vents

50
Q 
In newer steam heating systems, the condensate discharged by the steam traps drains by gravity through the return piping to: 
Select one:
a. The boiler 
b. A condensate tank  
c. A combination feeder/cut-off control.
d. A deaerator
A

b. A condensate tank

51
Q

Which of the following statement about constant air volume systems with perimeter heating is FALSE?
Select one:
a. Constant air volume systems with perimeter heating are well suited for larger buildings, due to the space available for the low velocity ductwork.
b. Interior zones may use reheat coils in the supply air ducts.
c. The exterior wall convectors supplement the heat in the supply air, which is kept near 12.5°C
d. Excessive room cooling can occur with the 12.5°C air supply

A

a. Constant air volume systems with perimeter heating are well suited for larger buildings, due to the space available for the low velocity ductwork.

52
Q

One of the disadvantages of forced warm air heating systems is the:
Select one:
a. Installation and maintenance costs are higher than steam heating systems
b. Air contains too much moisture
c. System can be quite noisy in comparison to gravity warm air heating systems
d. High cost for the system due to specialty equipment required

A

c. System can be quite noisy in comparison to gravity warm air heating systems

53
Q 
Of the following, which is a method of indirect electric heat? 
Select one:
a. Electric boilers  
b. Radiant panel heaters 
c. Wall heaters 
d. Unit heaters
A

a. Electric boilers

54
Q

Thermal transmission is the:
Select one:
a. The total heat flow due to all heat transfer modes, per unit time (in Watts)
b. Ability of a material of uniform thickness to transmit heat (W/m°C)
c. Same as thermal conductance.
d. Thermal energy flow, by conduction only, through a unit thickness of a single uniform type of material.

A

a. The total heat flow due to all heat transfer modes, per unit time (in Watts)

55
Q

The flow of water in a multi-zone hot water heating system is controlled by:
Select one:
a. Diverter fittings
b. Balancing valves
c. A circulating pump for each heating zone
d. Induction coils in each heating zone

A

c. A circulating pump for each heating zone

56
Q

The ventilation rate of a building is determined based upon the greater of the
Select one:
a. Solar heat rate and CFM rate per person
b. Conduction rate per person and solar heat rate
c. CFM rate and conduction rate per person
d. Infiltration rate and CFM rate per person

A

d. Infiltration rate and CFM rate per person

57
Q 
The maximum temperature of water in a gravity hot water system is:
Select one:
a. 65°C
b. 77°C
c. 87°C
d. 120°C
A

b. 77°C

58
Q

Which of the following statements about runaround heat recovery systems is FALSE?
Select one:
a. The energy expended by the circulating pump is recovered when preheating the ventilation air.
b. The system can be retrofitted to existing installations.
c. The system does not require piping.
d. The exhaust and ventilation streams can be located at a distance from each other.

A

c. The system does not require piping.

59
Q 
Two methods of calculating air infiltration into a building are the: 
Select one:
a. Crack and attrition method 
b. Air change and solar method  
c. Crack and conduction method 
d. Air change and crack method
A

d. Air change and crack method

60
Q

One of the advantages of hot water heating compared to steam heating is:
Select one:
a. Hot water boilers are more fuel efficient
b. Hot water systems have lower maintenance costs
c. Hot water systems do not require water treatment
d. Constant radiator temperature is easier to maintain in a hot water system

A

b. Hot water systems have lower maintenance costs

61
Q

Which two dampers operate together in an HVAC system?

Select one:

a. fresh air, exhaust air
b. return air, exhaust air
c. fresh air, return air
d. return air, mixed air

A

a. fresh air, exhaust air

62
Q

What is the generally accepted minimum amount of fresh air to satisfy human comfort and health?

Select one:

a. 25%
b. 5%
c. 10%
d. 15%

A

d. 15%

63
Q

In extremely cold climates, it may be necessary to _________________________ in an HVAC system.
Select one:
a. Close the outdoor air dampers
b. Install two separate pre-heat coils
c. Heat the dampers
d. Spray warm glycol on the hot water coils

A

b. Install two separate pre-heat coils

64
Q

At what outside air temperature would the steam valve, supplying the first preheat coil, be 50% open?

Select one:

a. 14°C
b. 1.5°C
c. -18°C
d. 3.5°C

A

b. 1.5°C

65
Q

When the outdoor air damper of an HVAC system opens to increase the flow of fresh air, the return air damper
Select one:
a. opens to increase the recirculated air
b. closes to increase the recirculated air
c. closes to reduce the recirculated air
d. modulates to maintain building static pressure

A

c. closes to reduce the recirculated air

66
Q

The most common residential system, where a furnace provides conditioned air to each room via ducts, is called a:
Select one:
a. Forced air system
b. Single zone, constant air volume system
c. Low velocity terminal re-heat system
d. Multi-zone system

A

a. Forced air system

67
Q

Thermal resistance (R) is the:
Select one:
a. Quantity of heat flow per unit time (in Watts)
b. Heat transfer through a one-metre cross-sectional area of a particular material with defined surfaces (W/m2°C)
c. Heat flow per unit time through one square metre of a material, when exposed to a differential temperature of 1 degree Celsius (W/m2°C)
d. Reciprocal of thermal conductance.

A

d. Reciprocal of thermal conductance.

68
Q

Which of the following statements about the unit ventilators is FALSE?
Select one:
a. The units provide individual temperature control, independent of other rooms.
b. Unit ventilators only provide cooling.
c. Unit ventilators may provide heating, cooling, or both.
d. Unit ventilators mix room air with outside air.

A

b. Unit ventilators only provide cooling.

69
Q 
A hot water system which circulates water through the pipes with a pump is known as a: 
Select one:
a. Circulating system 
b. Forced circulation system  
c. Closed system
d. Upfeed system
A

b. Forced circulation system

70
Q

Which of these statements about hydronic heat pumps is TRUE?
Select one:
a. Hydronic heat pump systems discharge heat to the outdoors during the cooling mode.
b. A single heat pump can provide simultaneous heating and cooling to several independent zones.
c. On hot days, when the cooling load is high, the heat recovered from the zones can reduce the firing rate of the hot water boiler.
d. Hydronic heat pump systems cannot provide ventilation air.

A

a. Hydronic heat pump systems discharge heat to the outdoors during the cooling mode.

71
Q

Thermal conductivity (λ) is the:
Select one:
a. Quantity of heat flow per unit time (in Watts)
b. Conductive heat transfer through a unit thickness of a single uniform type of material
c. Heat transfer through a one-metre cross-sectional area of a uniform material, in W/m2K
d. Reciprocal of the U-factor.

A

b. Conductive heat transfer through a unit thickness of a single uniform type of material

72
Q

The condensate that drains from the evaporator of a window air conditioner is:
Select one:
a. Drained on the floor
b. Drained to a pan below the condenser fan where it is thrown against the condenser coil and evaporates
c. Circulated through a chilled water coil
d. Circulated over the evaporator coil to keep it clean

A

b. Drained to a pan below the condenser fan where it is thrown against the condenser coil and evaporates

73
Q 
Lowboy furnaces are about \_\_\_\_\_ in height: 
Select one:
a. 1.0 m 
b. 0.5 m  
c. 1.4 m 
d. 1.2 m
A

d. 1.2 m

74
Q

All supply and drain lines of a steam heating system must be pitched to:
Select one:
a. Allow for drainage of condensate
b. Allow collection of air at the highest points
c. Prevent corrosion
d. Allow for thermal expansion

A

a. Allow for drainage of condensate

75
Q 
\_\_\_\_\_\_\_\_\_\_\_ is used to expel air from the risers and main headers of the steam heating system. 
Select one:
a. A deaerator
b. An air condenser
c. An air ejector
d. An automatic air vent
A

d. An automatic air vent

76
Q

One advantage of forced warm air heating systems over steam or hot water heating systems is:
Select one:
a. The ease with which ductwork can be installed
b. Forced air heating systems can introduce and regulate ventilation air
c. Forced air heating systems are maintenance free
d. Forced air heating systems are virtually noise free

A

b. Forced air heating systems can introduce and regulate ventilation air

77
Q

Special diverter fittings are required in one-pipe hot water systems to:
Select one:
a. Divert air from each convector
b. Assist condensate flow to the boiler
c. Divert water from the condensate tank to the boiler
d. Ensure an adequate flow of hot water through each convector

A

d. Ensure an adequate flow of hot water through each convector

78
Q

The HVAC induction system gets its name from
Select one:
a. The way air in the room is mixed with the supply air
b. The type of fan coils used
c. The type of air handling unit used
d. The use of electric induction heaters to heat the air.

A

a. The way air in the room is mixed with the supply air

79
Q

What kind of water is used in a clean steam humidification system?

Select one:

a. raw water
b. soft water
c. Demineralized water
d. potable water

A

c. Demineralized water

4 B (12 decks)

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