Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 100%
  • 90%
  • 80%

2: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

3: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • store excess refrigerant from the reciver
  • filter out impurities from the system
  • reduce friction loss to the flow of refrigerant

4: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

5: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would make the condenser more efficient
  • it would make the condenser less efficient
  • it would cause the condenser to sweat
  • it would have no effect on the condenser

6: What device should be used on low-temperature freezers?

  • oil separator
  • high capacity TXV
  • discharge muffler
  • hot-gas by-pass

7: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 44 lbs
  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs

8: B3 refrigerants are considered

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

9: How many flammability classifications are refrigerants in?

  • 3
  • 5
  • 7
  • 2

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

  • 15
  • 5
  • 20
  • 1

11: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants

13: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

14: 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

15: "E" represents _____ in the Watt's law formula.

  • amperage
  • voltage
  • watts
  • reactance

16: Class 3 refrigerants are

  • toxic
  • highly flammable
  • non-flammable
  • non-toxic

17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

18: What does an anemometer measure?

  • voltage
  • temperature
  • velocity
  • amperage

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

  • 100
  • 1
  • 10
  • 50

20: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection and a rupture disc
  • over pressure protection as well as a temperature protection device

21: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid

22: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and the stop valve
  • between the compressor and oil separator
  • between the compressor and reciever

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

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

24: How much clearance do you need around the perimeter of electrical panels?

  • 18"
  • 12"
  • 36"
  • 24"

25: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled
  • the heat gained by the condenser