Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

2: Refrigerants shall be classified by

  • maximum permissible quantities of each group
  • color codes
  • toxicity and flammability
  • requirements for commercial, industrial, and residential occupancies

3: Heat is a form of

  • matter
  • power
  • work
  • energy

4: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 50
  • 350
  • 550
  • 100

5: How many forces operate a thermostatic expansion valve?

  • 3
  • 4
  • 2
  • 1

6: When an electronic bridge is in balance the bridge output will be

  • 1 volt
  • .01 volts
  • 0 volts
  • 15 volts

7: What pipe can not be used for refrigeration?

  • M
  • N
  • K
  • L

8: B3 refrigerants are considered

  • toxic and highly flammable
  • non-toxic but flammable
  • toxic but non-flammable
  • non-toxic but non-flammable

9: 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

10: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Ducted and sealed
  • Welded and seamed.

11: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • bi-annually
  • regularly
  • quarterly
  • annually

12: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1
  • 1.2
  • 2.2
  • 1.5

13: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

14: What is not a requirement of a class T machine room?

  • automatic ventilation
  • tight fitting doors
  • fire hose connection to the building fire protection system
  • self-closing doors

15: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • institutional occupancy
  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy

16: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 108
  • 88
  • 38

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

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

18: Pi equals approximately

  • 3.41
  • 12,000
  • 3.14
  • 746

19: Trichlorofluoromethane is the name of what refrigerant?

  • R-11
  • R-12
  • R-113
  • R-502

20: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

21: If the spring is adjusted to increase the superheat, this new setting will

  • have no effect on the frost line
  • lengthen the frost line
  • shorten the frost line
  • allow more liquid into the evaporator

22: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 1250
  • 2
  • There isn't enough information to answer.
  • 2.5

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

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

24: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-2
  • A-1
  • B-1

25: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.