Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall not be used for air condition for human comfort
  • shall be allowed to be used for human comfort.
  • shall be installed in Class T machinery rooms

2: Horizontal piping should be run level.

  • False
  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True

3: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 158F
  • 32F
  • 155F
  • 45F

4: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Anyone, it's a completely safe area
  • Any employee
  • Authorized persons only

5: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

6: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

7: The first step in mechanical refrigeration is

  • expansion
  • compression
  • evaporation
  • condensation

8: How many groups of refrigerants are there?

  • 7
  • 5
  • 1
  • 3

9: Indirect systems using Group II refrigerants

  • shall be used in refrigeration system less than 1,000 lbs
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room

10: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 90%
  • 75%

11: When should a relief valve start to function?

  • 10 psi before it's set pressure
  • At it's set pressure
  • Two times it's working pressure
  • Before the purge station discharges

12: 746 watts is equal to

  • 1 hp
  • 10 hp
  • Pi
  • 100 hp

13: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

14: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the low side
  • lower chamber of the high side
  • upper chamber of the high side

15: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • lower
  • higher
  • the same
  • there is no Group B1 refrigerants

16: Liquid level gauges must be provided with what?

  • A low level mark
  • A red line
  • A relief valve
  • Automatic shut-offs

17: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

18: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

19: Which of the following is not an air velocity meter?

  • Hydrometer
  • Anemotherm
  • Anemometer
  • Velometer

20: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize

21: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • Yes, Under certain condidtions
  • Yes, always
  • No, never

22: Oils, classified as to source, are

  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor

23: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • ammonia
  • methyl chloride
  • trichlorotrifluoromethane
  • R-718

24: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

25: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above