BOMA HVAC Pretest Questions and Answers
The generalized comfort chart can be used as a basis to ____.
a. determine combinations of temperature and humidity to produce comfort in summer and winter
b. study air and its properties
c. determine the amount of fresh air make up necessary for com...
BOMA HVAC Pretest Questions
and Answers
The generalized comfort chart can be used as a basis to ____.
a. determine combinations of temperature and humidity to produce comfort in summer
and winter
b. study air and its properties
c. determine the amount of fresh air make up necessary for comfort
d. none of the above - Answer-a. determine combinations of temperature and humidity
to produce comfort in summer and winter
The condenser ____.
a. rejects the heat from the refrigerant
b. controls the refrigerant flow throughout the system
c. adds superheat to the refrigerant
d. all of the above - Answer-a. rejects the heat from the refrigerant
Positive displacement compressors have crankcase heat to ____.
a. preheat the chilled water for better efficiency
b. prevent refrigerant migration to the compressor
c. preheat the compressor bearings for longer wear
d. minimize condenser subcooling - Answer-b. prevent refrigerant migration to the
compressor
If the power element of a TX valve loses its charge, the ____.
a. coil will flood enough to feed liquid refrigerant out of the coil
b. valve will get cold enough to create farost on the body of the valve
c. refrigerant flow through the various circuits of the coil will become unbalanced
d. refrigerant flow to the coil will stop - Answer-d.
A normally operating water-cooled condenser is operating with a 10° differential
between water in and water out. If the amount of 85°F water going through the
condenser is reduced, which of the following is a possible temperature of the water
leaving the condenser?
,a. 75°F
b. 0°F
c. 95°F
d. 105°F - Answer-d. 105°F
High temperature refrigeration is that produced by ____.
a. heat from a furnace
b. an air-conditioning system
c. the vegetable cooling system of a refrigerator
d. the freezer section of a refrigerator - Answer-b.an air-conditioning system
Of the following choices, the warmest temperature is ____ while the coldest
temperature is ____.
a. 20°C
b. 303°K
c. 501°R
d. 77°F - Answer-b. 303°K
Infiltration is the term used when referring to the air entering a structure ____.
a. through an air make-up unit
b. around doors and windows
c. through ventilation
d.because of street traffic - Answer-b.around doors and windows
A micron gauge is used to measure ____.
a. atmospheric pressures at high altitudes
b. atmospheric pressures at sea level
c. absolute pressures below 1 mm Hg
d. high pressure in a refrigeration system - Answer-c.absolute pressures below 1 mm
Hg
The compressors used in low pressure chillers are the ____ type.
a. reciprocating
b. scroll
c. screw
d. centrifugal - Answer-d. centrifugal
Most of the heat energy in the suction vapor entering the compressor is ____.
a. heat of compression
b. sensible heat
, c. latent heat
d. defrost heat - Answer-c. latent heat
The __ laws of thermodynamics that apply to heating and airconditioning.
a. 2
b. 3
c. 1
d. 4 - Answer-a. 2
If the thermal bulb assembly develops a leak, what will occur?
a. All of the system's refrigerant will leak out.
b. The bulb pressure will reduce and the valve will close.
c. The valve will open to allow more refrigerant to flow.
d. It will have no effect on system operation. - Answer-b.The bulb pressure will reduce
and the valve will close.
The capacity of an evaporator is affected by ____.
a. the saturation pressure of the low side of the system
b. the saturation pressure of the high side of the system
c. the amount of evaporator superheat
d. all of the above - Answer-d. all of the above
The heat required for off-cycle defrost is obtained from ____.
a. supplemental electric heat when the system is shut down
b. hot gas when the system is operating
c. the space temperature when the compressor is off
d. hot liquid from the compressor - Answer-c. the space temperature when the
compressor is off
A motor's speed is determined by ____.
a. size
b. voltage
c. amperage
d.number of motor poles - Answer-d. number of motor poles
By design, which of the following air ducts will allow 250 cfm to flow with a velocity of
500 ft/min?
a. 8" x 9"
b. 16" x 9"
c. 10" x 9"
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