Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • high side of the system
  • the liquid side of the system
  • low side of the system
  • the vapor side of the system

2: If your suction line is warmer than the room temperature, this may indicate

  • an over charge
  • below normal superheat
  • plugged air filter
  • a low charge

3: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • first disconnect in
  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • breaker panel in
  • load-side of the contactor in

4: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 33
  • 22
  • 18

5: Class A refrigerants are considered

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

6: When using nitrogen for brazing, the pressure should be:

  • Slightly below atmospheric
  • Very low
  • 50-100 psig
  • 125 psig

7: 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

8: What is Trichlorotrifluoromethane?

  • R-11
  • R-13
  • R-12
  • R-113

9: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

10: 746 watts is equal to

  • 1 hp
  • Pi
  • 100 hp
  • 10 hp

11: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

12: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

13: R-22 falls under which safety classification?

  • B-1
  • B-2
  • A-2
  • A-1

14: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Contractor who last serviced the system.
  • Board of Boilers
  • Person who pulled the permit

15: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • R-718
  • trichlorotrifluoromethane
  • ammonia
  • methyl chloride

16: Suction valve unloaders afford an effective means of

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

17: What is the refrigerant dichlorodifluoromethane?

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

18: "I" represents _______ in the Watt's law formula.

  • voltage
  • amperage
  • watts
  • reactance

19: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • salt
  • soil
  • sugar

20: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 77F
  • 58F
  • 32F
  • 70F

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

  • 150
  • 100
  • 330
  • 200

22: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 12 AWG
  • 14 AWG

23: 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
  • reset the safety valve
  • start the fan and circulating pump

24: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 5.5
  • 2.5
  • 3.0
  • 2.0

25: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above