Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A water regulating valve opens when

  • the compressor is on
  • when the power is on
  • the head pressure rises
  • when the power is on there is an overcharge of refrigerant

2: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the expansion valve
  • start the comrpessor
  • start the fan and circulating pump
  • reset the safety valve

3: What is Trichlorotrifluoromethane?

  • R-113
  • R-13
  • R-12
  • R-11

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

  • Encased
  • Coated
  • Leaked checked
  • Certified

5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • .9776 watts
  • 977.6 watts
  • 9,776 watts

6: A class B1 refrigerant is considered

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

7: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • True
  • are obsolete.
  • False
  • depends on the type of refrigerant being used

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

  • 10%
  • 20%
  • 15%
  • 5%

9: Which oil is hydoscopic?

  • animal
  • polyolester
  • mineral
  • SW30

10: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-22
  • R-123
  • R-12

11: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

12: A relief valve discharge capacity is rated in

  • Pounds of air per minute.
  • PSIA
  • temperature minus pounds of air per second divided by release rate squared
  • PSIG

13: A micron is

  • one thousandths of a millimeter
  • a larger unit of measurement than Hg
  • one millonths of a centimeter
  • one millonths of a micrometer

14: Who is permitted to access a refrigeration machine room?

  • Any employee
  • Authorized persons only
  • Contractors only
  • Anyone, it's a completely safe area

15: 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

16: Ammonia belongs to Group

  • A-2
  • A-1
  • B-2
  • B-1

17: Class T machine room

  • shall include closets used for setting equipment
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed

18: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • convert velocity energy to pressure
  • increase the clearance space
  • prevent high pressure on the packing

19: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • low head pressure
  • not enough oil in the system
  • oil in evaporator
  • moisture in the system

20: Color is important in oil because

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

21: The high side float assembly meters refrigerant into the evaporator through the

  • upper chamber of the low side
  • upper chamber of the high side
  • lower chamber of the high side
  • lower chamber of the low side

22: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 200
  • 330
  • 100

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

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

24: Thermodynamics is the branch of science that deals with

  • energy due to motion
  • heat energy
  • state of energy
  • molecular therory

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

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