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Refrigeration exam, Exams of Technology

Virginia Military Institute (VMI)Technology

50 MCQs with solution booklet.

Typology: Exams

2021/2022

Uploaded on 02/24/2022

sohail 🇺🇸

4.5

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Association of Air Conditioning Professionals

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

Multiple Choice.

1) The main purpose of the accumulator is to

a) Prevent liquid slugs at the compressor

b) Provide space for vapor to accumulate

c) Provide space for the accumulation of oil and contaminants

d) Store liquid refrigerant

2) Heat that changes the physical state of a substance without effecting a change in its

temperature is known as

a) Sensible heat

b) Specific heat

c) Latent heat

d) Lost heat

3) The location of the thermal bulb for the TXV on the evaporator affects

a) Both the pressure and temperature in the feeler bulb

b) The amount of superheat required to operate the TXV

c) The amount of liquid in the evaporator

d) The amount of gas in the evaporator

4) If the spring is adjusted to increase the superheat, this new setting will

a) Shorten the frost line

b) Lengthen the frost line

c) Have no effect on the frost line

d) Allow more liquid into the evaporator

5) The amount of heat required to raise the temperature of 1 lb of water 1°F is?

a) The rate of conduction

b) 1 BTU

c) 1 Therm

d) 1 Kelvin

6) The low pressure oil safety switch

a) Must be reset manually

b) Resets itself automatically

c) Resets itself after the time delay has terminated

d) Never trips

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Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

Multiple Choice.

The main purpose of the accumulator is to a) Prevent liquid slugs at the compressor b) Provide space for vapor to accumulate c) Provide space for the accumulation of oil and contaminants d) Store liquid refrigerant
Heat that changes the physical state of a substance without effecting a change in its temperature is known as a) Sensible heat b) Specific heat c) Latent heat d) Lost heat
The location of the thermal bulb for the TXV on the evaporator affects a) Both the pressure and temperature in the feeler bulb b) The amount of superheat required to operate the TXV c) The amount of liquid in the evaporator d) The amount of gas in the evaporator
If the spring is adjusted to increase the superheat, this new setting will a) Shorten the frost line b) Lengthen the frost line c) Have no effect on the frost line d) Allow more liquid into the evaporator
The amount of heat required to raise the temperature of 1 lb of water 1°F is? a) The rate of conduction b) 1 BTU c) 1 Therm d) 1 Kelvin
The low pressure oil safety switch a) Must be reset manually b) Resets itself automatically c) Resets itself after the time delay has terminated d) Never trips

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

Suction line oil traps should be installed when the condenser is? a) In the basement and the evaporator is on the third floor b) Located outside and operates in temperatures below 35°F. c) On the third floor roof and the evaporator is in the basement. d) More than 100’ away from the evaporator
The proper location for an oil separator is between the a) evaporator and compressor b) compressor and condenser c) condenser and receiver d) receiver and metering device
On a TXV, the purpose of an external equalizer is to? a) Increase the pressure on top of the power head diaphragm b) Balance the evaporator load c) Compensate for a pressure drop across the evaporator coil d) Allow a greater adjustment span
The approximate boiling point of R-12 at atmospheric pressure at sea level is? a) 21°F b) – 21°F c) – 41°F d) – 78°F
The freezing point of water is? a) 0°F b) – 10°C c) 32°C d) 32°F
Crankcase heaters are energized? a) While the compressor is running b) When the compressor is off c) To prevent compressor freeze-up d) To allow easy compressor start-up

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

A gage commonly used to measure the pressure in a system while it is being dehydrated is the a) Compound gage b) High-pressure gage c) Micron millimeter gage d) Scale
When an A/C system is excessively low on refrigerant a) It can become contaminated with water b) There can be nuisance trip outs c) The suction line may be too hot to touch d) All of the above
On an A/C system, the likely cause for a frosted evaporator is a) Low on refrigerant b) Dirty air filter c) Both a & b d) Neither a & b
While the system is operating, the discharge line should be a) Too hot to hold by hand b) At the same temperature as the crankcase c) 10 to 15°F warmer than ambient d) room temperature
The most common method used to determine superheat is accomplished by a) Using the suction gage and a pressure temperature chart and taking a thermometer reading under the suction line insulation near the gage port b) Using one thermometer at the evaporator inlet and another at the evaporator outlet c) Measuring the air temperature split across the coil d) A clear sight glass will eliminate the need to take superheat readings
The biggest problem caused by moisture in the refrigeration system is a) Freeze-up at the expansion valve b) Rusted parts inside the compressor c) Burned out compressor motors d) Slightly less heat transfer

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

When used as a drier in the liquid line, silica gel a) Dehydrates water b) Releases water c) Absorbs water d) Collects air
When is a condensate trap not required a) When the condensate drain is on the suction side of the blower b) When the condensate drain is on the discharge side of the blower c) When an auxiliary drain pan is used d) Traps are always required
An instrument used to indicate humidity conditions is a a) Thermometer b) Hydrometer c) Hygrometer d) Pyrometer
Excessive head pressure is often caused by a) Insufficient refrigerant b) Leaking reed valve on the discharge side c) Air cooled condenser is plugged d) Thermostat set too high
What is the suction gas temperature of R-22 if the pressure is measured as 68 psig? a) 68°F b) 40°F c) 117°F d) 125°F
With a 5/8” x 5/8” x ¾” tee, what size is the center connection? a) 3/8” b) ½” c) 5/8” d) ¾”

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

What component in a thermostat will cut off the heating unit before it reaches setpoint? a) Bi-metal strip b) Fan switch c) Mercury bulb d) Heat anticipator
How are safety controls wired in HVAC systems? a) Parallel wired b) Series wired c) Parallel series wired
On an R-22 system, when the suction line pressure is 66 psig and its temperature is 50°F, what is the superheat? a) 50°F b) Ambient temperature – 50°F c) 17°F d) 12°F
What terminals on a conventional thermostat can be jumped to prove the circuit to the blower? a) R and G b) R and Y c) R and W d) R and C
What should you measure to determine if a compressor is burnt? a) Resistance from winding to winding b) Resistance from winding to ground c) Both a & b d) Neither a or b
What does the condenser do? a) Collects heat from the conditioned space b) Allows refrigerant to boil off c) Gives up the heat from the refrigerant d) Transfers heat to the refrigerant

Apprenticeship Credit-by-Exam Practice Exam for Basic Refrigeration

A hard start kit consists of a a) Multivoltage transformer and wire for the line starter b) Group of capacitors used in parallel c) Potential relay and a start capacitor
The primary function of the expansion valve is to a) Regulate the flow of refrigerant according to the heat load b) Regulate the evaporator temperature according to the heat load c) Expand the refrigerant d) Evaporate the refrigerant
A service valve is said to be front seated when a) The auxiliary port for the pressure gauge is closed b) No refrigerant can enter or exit the compressor c) The main refrigerant flow port is open
When a compressor start and stops too frequently, it is called a) Short cycling b) Erratic action c) A long skirted piston
What device proves the pilot flame in a typical furnace a) Gas valve b) Thermocouple c) High limit switch d) Klixon
A sight glass will a) Indicate moisture b) Show flash gas c) Both a & b d) Neither a or b
Sensible heat is a) The heat required to make a change of state of a fluid b) The heat required to raise the temperature of a fluid c) The heat required to evaporate a fluid

Refrigeration exam, Exams of Technology

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1. A

2. C

3. C

4. A

5. B

6. A

7. C

8. B

9. C

10. B

11. D

12. B

13. C

14. B

15. C

16. A

17. C

18. B

19. C

20. D

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22. A

23. A

24. C

25. A

26. B

27. C

28. C

29. B

30. D

31. C

32. B

33. C

34. B

35. B

36. B

37. A

38. D

39. B

40. D

41. A

42. C

43. C

44. C

45. A

46. B

47. A

48. B

49. C

50. B