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VIU PWR ENG Part B > Building Environmental Systems and Control > Flashcards

Building Environmental Systems and Control Flashcards

1
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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2
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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3
Q 
Heat lost from a building is: 
Select one:
a. Independent of indoor air temperature 
b. Greater on windier days  
c. Independent of outside temperature 
d. Dependent on barometric pressure
A

b. Greater on windier days

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4
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

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5
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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6
Q 
When fan belts show signs of fraying, cracking, and wear, they should be: 
Select one:
a. Repaired 
b. Replaced  
c. Re-tightened 
d. Dressed
A

b. Replaced

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7
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

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8
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

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9
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.

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10
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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11
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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12
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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13
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

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14
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

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15
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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16
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

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17
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

a. Circulating system

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18
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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19
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

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20
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

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21
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

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22
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

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23
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

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24
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

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25
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

26
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

27
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

28
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

29
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

30
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

31
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

32
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

33
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.

34
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.

35
Q

The radiator trap is a device that allows:
Select one:
a. Water and steam to mix.
b. Water and steam to collect.
c. Steam to enter the radiator, while preventing water from discharging.
d. Water to discharge from the radiator, while preventing steam from discharging.

A

d. Water to discharge from the radiator, while preventing steam from discharging.

36
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

37
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

38
Q

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

Select one:

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

A

c. Demineralized water

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

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

41
Q

Which two dampers operate together in an HVAC system?

Select one:

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

A

d. fresh air, exhaust air

42
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 close, RA dampers open
c. Fans stay running, OA and EA dampers modulate to minimum, RA dampers modulate to meet OA/EA
d. Fans shut down, OA and EA dampers open, RA dampers close

A

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

43
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

44
Q

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

Select one:

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

A

b. 15%

45
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

46
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

47
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

48
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.

49
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

50
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

51
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

52
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

53
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 unit heater

54
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

55
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

56
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

57
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

58
Q 
Infrared heaters are usually mounted: 
Select one:
a. Overhead  
b. At shoulder height 
c. Under windows 
d. Above doorways
A

a. Overhead

59
Q

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

Select one:

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

A

b. CO and O2

60
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)

VIU PWR ENG Part B (18 decks)

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