Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Two systems using separate refrigerants that are superimposed upon one another is called

  • booster
  • indirect
  • single stage
  • cascade

2: On a single phase motor, when does the start winding cut out?

  • Start windings do no cut-out of the run cycle
  • At 25% of its full rated speed
  • At 50% of its full rated speed
  • At 75% of its full rated speed

3: Refrigeration piping before being buried shall be

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

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

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

5: R-11 has the greatest corrosive effect on

  • Magnesium
  • Aluminum
  • Copper
  • Bronze

6: The color code of a tank of ammonia is

  • white
  • silver
  • light green
  • lavender

7: Suction line oil traps should be installed when the condenser is

  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator
  • in the basement and the evaporator is on the third floor
  • on the third floor roof and the evaporator is in the basement

8: In an electrical circuit, what is potential measured in?

  • Amps
  • Ohms
  • Volts
  • Herys

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

  • quarterly
  • bi-annually
  • annually
  • regularly

10: A low oil switch is typically

  • automatic reset
  • manual reset
  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity

11: 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

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

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

13: How many closing forces operate a thermostatic expansion valve?

  • 1
  • 3
  • 4
  • 2

14: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Dirty fan blades
  • Dirty Coil
  • Prevailing winds

15: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

16: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

17: Fractionation occurs when

  • the pressures increase as the heat load increases
  • the pressures decreases as the heat load decreases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • when a fraction of refrigerant is added as the full charge

18: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

19: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 2
  • 1
  • 5
  • 3

20: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 1/8"
  • 1/16"
  • 3/32"

21: Which refrigerant is lighter than air?

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

22: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

23: Refrigerants shall be classified by

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

24: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

25: All serviceable components of a refrigeration system shall be provided with

  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • manufactures instructions on start-up procedures
  • safe access
  • service manuals