Power Engineering Chapter 132
Showing posts with label Power Engineering Chapter 132. Show all posts
Showing posts with label Power Engineering Chapter 132. Show all posts

When looking at building function to select a system which of the following factors are considered? i) Physical size of the building ii) Climatic conditions iii) Amount of zoning required iv) Funds available for the system v) Occupancy periods vi) Need to operate certain areas off-hours

When looking at building function to select a system which of the following factors are considered?
i) Physical size of the building
ii) Climatic conditions
iii) Amount of zoning required
iv) Funds available for the system
v) Occupancy periods
vi) Need to operate certain areas off-hours



a) i, ii, and vi
b) iii, v, and vi
c) i, iii, iv, v, and vi
d) ii, v, and iv
e) i, iii, iv, and vi






Answer: B

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 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?




a) Building owner's considerations
b) Geographical location
c) Building layout
d) Operating costs
e) Maintenance requirements




Answer: A

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 coils iii) An air mixing section iv) Filters v) A humidifier vi) A dehumidifier

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 coils
iii) An air mixing section
iv) Filters
v) A humidifier
vi) A dehumidifier



a) i, ii, iii, and iv
b) i, ii, v, and vi
c) ii, iii, iv, and v
d) i, iii, and v
e) iii only






Answer: C

Which of these statements about hydronic heat pumps is true?

Which of these statements about hydronic heat pumps is true?



a. The units discharge heat to the water piping during the cooling mode
b. The piping must be insulated
c. The water temperature is below the dewpoint of the room air
d. Condensate drains from each unit are not necessary
e. The refrigeration system is cooled by Freon, such as R-12






Answer: A

Which of the following statements is not true for a variable volume HVAC system with perimeter heating?

Which of the following statements is not true for a variable volume HVAC system with perimeter heating?




a. Air is supplied at a temperature of about 12.5°C
b. Room temperature is controlled by the volume of air supplied
c. The supply air duct pressure varies widely when heating and cooling loads vary
d. The conditioned air is distributed via low or medium velocity duct work
e. Zone supply air is modulated by, a variable air volume box located at each branch outlet






Answer: C

Which statement about compartmental variable air volume HVAC systems is false?

Which statement about compartmental variable air volume HVAC systems is false?



a. Smaller air handling units are located on each floor replacing a larger central unit
b. Each air handling unit is installed in a mechanical room for noise reduction, safety and appearance
c. Each air handling unit has its own filter, cooling coil and supply air fan
d. Each compartmental unit supplies from 15 to 100% outside air for ventilation and cooling
e. A central air handling unit provides humidified air at 12.5°C for ventilation to each floor




Answer: D

To maintain space conditions during heating this system zone thermostat reduces the air flow to a minimum of 20% before modulating the output of the heat supply.

To maintain space conditions during heating this system zone thermostat reduces the air flow to a minimum of 20% before modulating the output of the heat supply.




a. Hydronic heat pump system
b. Fan coil unit with make-up air system
c. Variable air volume system
d. Dual duct system
e. Constant air volume system





Answer: C

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 during winter
c. Piping is connected to the chiller during summer
d. The arrangement is made up of a supply and return connection to a single coil
e. The system can heat and cool at the same time







Answer: E

Which of the following statements about fan coil units combined with make-up air systems is false?

Which of the following statements about fan coil units combined with make-up air systems is false?



a. The units include a disposable filter, fan and heating/cooling coil
b. Ventilation is provided by a 100% outside air system
c. The air handling unit includes filters, heating coil, cooling coil and supply fan
d. Fan coil units are installed in each room
e. The fan coil units provide humidity control






Answer: E

Which of the following statements is NOT true for an induction HVAC system?

Which of the following statements is NOT true for an induction HVAC system?



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. The primary air can be heated proportionally to the outside air temperature
d. The primary high-pressure air is supplied at a constant 12.5°C
e. With a two-pipe system temperature control is difficult during seasonal changes








Answer: D

Which of the following statements about hydronic heat pump HVAC system is false?

Which of the following statements about hydronic heat pump HVAC system is false?



a. The unit discharges heat to the water piping system during the cooling mode
b. The water temperature must be between 15°C and 32°C
c. Pipe insulation is not required as the water temperature is above the room air dew point
d. The system can be thermally self-balancing when heat rejected by the interior zones is used by the exterior zones
e. A boiler is not required during the heating season






Answer: E

For which HVAC system is the central fan usually provided with variable inlet vanes, so that the air supply duct pressure can be maintained at a setpoint?

For which HVAC system is the central fan usually provided with variable inlet vanes, so that the air supply duct pressure can be maintained at a setpoint?




a. Variable air volume system
b. Hydronic heat pump system
c. Dual duct system
d. Fan coil unit with make-up air system
e. Constant air volume system







Answer: A

Which of the following statements is not true for a variable volume HVAC system with perimeter heating?

Which of the following statements is not true for a variable volume HVAC system with perimeter heating?





a. Air is supplied at a temperature of about 12.5°C
b. Room temperature is controlled by the volume of air supplied
c. The supply air duct pressure varies widely when heating and cooling loads vary
d. The conditioned air is distributed via low or medium velocity duct work
e. Zone supply air is modulated by, a variable air volume box located at each branch outlet





Answer: C

A common complaint against the fan coil unit with make-up air is:

A common complaint against the fan coil unit with make-up air is:



a. The response is very slow when first turned on
b. The unit must be shut off when the room is unoccupied
c. The fan noise is excessive
d. The fan stirs up a great deal of dust
e. The unit requires too much maintenance







Answer: C

Locating HVAC equipment in mechanical rooms is preferred:

Locating HVAC equipment in mechanical rooms is preferred:



a. So that larger equipment can be used
b. To make the maintenance easier
c. So that maintenance may be performed without disturbing occupants
d. To make maintenance more difficult
e. So that all equipment is close together





Answer: C
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