Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

2: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • a fusible plug
  • a pressure relief device
  • either a fusible plug or a pressure relief device
  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified

3: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

4: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When there are sprinklers above
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system

5: When the compressor is below the condensor

  • traps are not needed on this type of system
  • traps are needed on the suction line
  • traps are needed on the discharge line
  • traps are needed on the oil return line

6: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

7: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • outside the room, immediately adjacent to each door
  • inside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • on a conspicuous card located near the evaporator

8: A tachometer is an instrument used to measure

  • speed
  • air velocity
  • static pressure
  • RPM

9: B3 refrigerants are considered

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

10: Humidity can be sensed with

  • human hair
  • pressure bellows
  • thermometer
  • bimetal

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

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

12: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • surge
  • splurge
  • merge

13: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 208v
  • 120v
  • 240v
  • 277v

14: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

15: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

16: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less

17: Which refrigerant class listed below is the most flammable?

  • A3
  • B2
  • A2
  • C3

18: No open flames are allowed in the machinery room unless?

  • Approved by the installing contractor
  • Never can be allowed
  • Only when combustion air is provided from outside of the machinery room
  • Approved by the authorized person

19: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

20: Capacity control on a centrifugal compressor is accomplished by the

  • post-rotational guide vanes
  • slide vanes
  • pre-rotational guide vanes
  • check valves

21: What must be done to refrigerant pipes before being buried?

  • Leaked checked
  • Encased
  • Coated
  • Certified

22: Which refrigerant is lighter than air?

  • R-717
  • R-11
  • R-123
  • R-134a

23: The best way to detect ammonia in brine is

  • potassium of line
  • nessler regaent
  • CO2 gas
  • carbonation of soda

24: Heat is a form of

  • power
  • energy
  • matter
  • work

25: While the system is operating, the discharge line should be

  • too hot to hold by hand
  • at the same temperature as the crankcase
  • 10-15F warmer than ambient
  • room temperature