Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-12 is

  • dichlorofluoromethane
  • trichlorofluoromethane
  • dichloromethane
  • dichlorodifluoromethane

2: 1 Watt = ______ BTU's?

  • 3.412
  • 4.482
  • 12
  • 7.216

3: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • refractometer
  • Psychrometer
  • hydrometer

4: "R" represents ___ in the Ohm's law formula

  • amperage
  • voltage
  • capacitance
  • resistance

5: The measurement of heat in a particular substance is

  • enthalpy
  • latent heat
  • sensible heat
  • specific heat

6: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • there is no Group B1 refrigerants
  • higher
  • the same
  • lower

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

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

8: 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

  • splurge
  • merge
  • purge
  • surge

9: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 365 psig
  • 327 psig
  • 255 psig
  • 125 psig

10: What is Absolute Zero?

  • -640F
  • -773F
  • -400F
  • -460F

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

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

12: In an electrical circuit, what is potential measured in?

  • Ohms
  • Herys
  • Amps
  • Volts

13: 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

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

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

  • 100
  • 1
  • 10
  • 50

15: 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

16: While the system is operating, the discharge line should be

  • too hot to hold by hand
  • room temperature
  • at the same temperature as the crankcase
  • 10-15F warmer than ambient

17: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

18: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 108
  • 116
  • 88
  • 38

19: A micron is

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

20: Halogen refrigerants are corrosive to which type of metal?

  • stainless steel
  • copper
  • black iron
  • magnesium

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

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

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

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

23: Low-side system leaks in a low-pressure chiller will often result in

  • system refrigerant leaking from the system
  • nitrogen leaking out of the system.
  • water being pulled into the system
  • air being pulled into the system

24: 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.
  • High head pressure and low suction pressure
  • Low suction pressure and low discharge pressure
  • Low head pressure and high suction pressure

25: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 9F
  • 21F
  • 11F
  • 29F