- | P a g e
HVAC BOMA 501 Actual Exam Version 1,2 & 3 (3 Latest Versions) Newest 2025/2026 With Complete Questions And Correct Answers |Already Graded A+||Brand New Version!
VERSION 1
If the resistance against a propeller fan is doubled, the cfm output decreases, but the amperage draw of the motor ___.
- decreases
- increases
- stays the same
- overheats the motor - ANSWER-b. increases
Which of the following represents a different temperature than the other three?
- 15°C
- 59°F
- 475°K
- 519°R - ANSWER-c. 475°K 1 / 4
- | P a g e
The best method of leak checking is when the refrigeration system is ____.
- in a vacuum
- open to the atmosphere
- operating with all fans activated
- standing with dry nitrogen pressure of 150 psig in the system. -
ANSWER-d. standing with dry nitrogen pressure of 150 psig in the system.
Technician "A" says that if the air filter on an air-conditioning system is totally blocked with dirt, the amperage draw of the evaporator fan motor will go down. Technician "B" says that if you close down one supply register on a duct system, the volume of air feeding the other locations will increase slightly. Which of the following statements is correct?
- Technician "A" is correct. Technician "B" is correct.
- Technician "A" is correct. Technician "B" is incorrect.
- Technician "A" is incorrect. Technician "B" is correct.
- Technician "A" is incorrect. Technician "B" is incorrect. - ANSWER-
- Technician "A" is correct. Technician "B" is correct.
The refrigerant in a refrigeration system changes state in the ____. 2 / 4
- | P a g e
- condenser and compressor
- compressor and expansion device
- expansion device and evaporator
- condenser and evaporator - ANSWER-d. condenser and evaporator
The amount of heat needed to change the temperature of a substance will vary with the type of substance.This heat quality is called the ___ of the substance.
- sensible heat
- specific heat
- latent heat
- relative heat - ANSWER-b. specific heat
Oil pressure safety controls measure the difference in pressure between the ___.
- oil pump inlet and discharge pressures
- oil pump discharge pressure and compressor head pressure
- oil pump inlet pressure and compressor suction pressure
- oil pump discharge pressure and compressor crankcase pressure -
ANSWER-d. oil pump discharge pressure and compressor crankcase pressure 3 / 4
- | P a g e
On a 95°F day, the R-22 refrigerant pressure on the high side should be about ____ psig.
- 182
- 108
- 297
- 243 - ANSWER-d. 243
The pressure in a refrigeration system is changed in the ___.
- condenser and compressor
- compressor and expansion device
- expansion device and evaporator
- condenser and evaporator - ANSWER-b. compressor and expansion
device
If the resistance against a centrifugal blower is doubled, the cfm output decreases, and the amperage draw of the motor ___.
- decreases slightly
- increases slightly
- stays the same
- / 4