Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia belongs to Group

  • B-1
  • A-2
  • B-2
  • A-1

2: A direct system

  • is where the refrigerant comes in contact with the space refrigerated
  • is a self-contained complete factory made and tested system
  • is on where brine is cooled & circulated to the space refrigerated
  • is one which encloses a separate body of evaporative refrigerant

3: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the coolest evaporator
  • Suction line at the compressor
  • Suction line prior to the accumulator of the lowest temperature system
  • Suction line of the warmest evaporator

4: A solder joint melts at temperatures of

  • less than 400F
  • 400F to 800F
  • 1,200F to 1,500F
  • 600F to 900F

5: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • CPR valve
  • EPR valve
  • EEV
  • Solenoid valve

6: How many CFMs are required per square foot of commercial office occupied space

  • 15 CFM
  • 20 CFM
  • 5 CFM
  • .5 CFM

7: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 720,000
  • 200
  • 12,000

8: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

9: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • of Group B2 refrigerant shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall not be prohibited
  • shall be prohibited

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

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

11: The equivalent length of pipe in a water piping system is

  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent-length of fittings

12: The two basic types of evaporators are

  • prime surface and finned
  • direct expansion and plate
  • flooded and direct expansion
  • finned and plate

13: Fusible plugs must have what marked on them?

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

14: Fusible plugs shall not be used with pressure vessels of

  • 15 cubic feet or more
  • 3 cubic feet or less
  • 3 cubic feet or more
  • 15 square feet or less

15: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 455 psig, 185 psig
  • 350 psig, 120 psig

16: Horizontal piping should be run level.

  • No, unless the supervisor on the job says so.
  • False
  • True
  • Yes, if the condenser is located above the evaporator

17: R-410A is classified as a ____ refrigerant on the safety matrix.

  • B-1
  • B-2
  • A-2
  • A-1

18: Capacity control on an absorption system is typically accomplished by varying the

  • rate at which heat is supplied to the generator
  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc
  • speed of the condenser water circulator pump

19: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and unbalanced head and friction head
  • GPM and balanced head and friction head
  • GPM and friction head
  • GPM, pipe size, and equivalent head.

20: How many flammability classifications are refrigerants in?

  • 3
  • 5
  • 7
  • 2

21: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

22: Stop valves shall not be permitted between the system and the

  • condenser
  • bleed valve
  • relief valve
  • service valve

23: 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
  • HCFC-123
  • ammonia

24: When air is ducted through a machine room that services occupied space, What must be done?

  • Insulated and cross broke
  • Flanged and gasketed
  • Welded and seamed.
  • Ducted and sealed

25: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above