Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

3: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

4: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

5: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • CFC-11
  • Lithium bromide
  • ammonia
  • HCFC-123

6: 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
  • splurge
  • surge
  • merge

7: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?

  • RPM and CFM increase
  • CFM and RPM decrease
  • CFM and HP increase
  • CFM and HP decrease

8: Refrigerants shall be classified by

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

9: How many gallons of water do you need per pound of ammonia?

  • 10
  • 1
  • 50
  • 100

10: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of the liquid line

11: What is the maximum voltage range allowed on an electrical circuit?

  • 15%
  • 10%
  • 20%
  • 5%

12: The density of a gas refers to

  • pounds per cubic foot
  • pounds per square foot
  • pounds per absolute pressure
  • cubic feet per pound

13: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • capacity control
  • refrigerant control

14: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

15: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 20
  • 10
  • 15
  • 25

16: The formula for Pure Power in a resistance circuit is

  • Watts = volts X amps
  • Watts X power factor
  • Kw = volts X amps
  • Watts X amps.

17: A halide torch is most useful with a freon compression system

  • to release a sticking valve
  • to sweat flanges on the refrigeration piping
  • to remove from from TXV's and evaporator coils
  • to detect refrigeration leaks in piping joints

18: Start to Run windings will have what resistance?

  • The least resistance value
  • The most resistance value
  • Somewhere between the actual start winding and run winding resistance value
  • All will be at equal values

19: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

20: Liquid line filter-driers on a 410A system must be rated for no less than

  • 1000 psig
  • 600 psig
  • 400 psig
  • 200 psig

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

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

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

  • Anemometer
  • Hydrometer
  • Anemotherm
  • Velometer

23: Color is important in oil because

  • can tell us something about the refining of oil
  • allows you to see into crankcase
  • it indicates the viscoisty.
  • it makes sight glasses easy to read

24: 746 watts is equal to

  • 100 hp
  • 1 hp
  • 10 hp
  • Pi

25: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • Low head pressure and high suction pressure
  • High head pressure and low suction pressure
  • High suction pressure and high discharge pressure.
  • Low suction pressure and low discharge pressure