Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Class A refrigerants are considered

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

2: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

3: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

4: In a motor, an internal overload might open if

  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an open start winding
  • there's a direct short

5: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

6: An accumulator can be located between the

  • evaporator and compressor
  • compressor and condenser
  • first stage and second stage compressors
  • condenser and evaporator

7: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 104 ohms
  • 71 ohms
  • 27 ohms
  • 80 ohms

8: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

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

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

10: What does safe access mean?

  • A clear unobstructed path to the equipment and controls
  • Locked doors
  • Well-lit exit signs
  • OSHA approved

11: 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
  • breaker panel in
  • load-side of the contactor in
  • 24 volt secondary side of the Class 2 transformer to the thermostat

12: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 208v
  • 120v
  • 277v
  • 240v

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

  • 70F
  • 58F
  • 32F
  • 77F

14: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

15: The critical temperature of a refrigerant gas occurs when

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

16: How are safety controls wired in a circuit?

  • Either series or parallel
  • Series
  • Series/parallel
  • Parallel

17: 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
  • moisture in the system
  • not enough oil in the system
  • oil in evaporator

18: What is Trichlorotrifluoromethane?

  • R-13
  • R-11
  • R-12
  • R-113

19: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% distilled water
  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% tap water

20: Most CFC's are

  • inert but toxic
  • inert
  • flammable
  • toxic

21: Pi equals approximately

  • 3.41
  • 746
  • 3.14
  • 12,000

22: What refrigerant is an inorganic compound?

  • R-22
  • Ammonia
  • R-132A
  • R-410A

23: How is bring measured?

  • hygrometer
  • hydrometer
  • manometer
  • anemometer

24: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 3
  • 2
  • 5
  • 4

25: The certificate of inspection

  • shall be posted and protected from dirt, water, and other elements
  • shall be authorized by a notarized insurance company
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit