Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: A secondary coolant is defined as

  • any refrigerant direcly in contact with the cooling space for process cooling
  • a low temperature refrigerant used for cascading systems
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F

3: Where is the high-side float located on a chiller system?

  • flash line
  • liquid line
  • inside the chiller barrel
  • discharge line

4: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Isothermal
  • Adiabatic
  • Volume Temperature
  • Pressure Temperature

5: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

6: What do you need to do when you install a new system?

  • Add refrigerant
  • Have it inspected
  • Insulate the suction line before you take a superheat reading
  • Document the superheat and subcooling reading

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

  • 1
  • 5
  • 20
  • 15

8: R-11 has the greatest corrosive effect on

  • Magnesium
  • Aluminum
  • Copper
  • Bronze

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

  • 21F
  • 11F
  • 9F
  • 29F

10: What instrument is used to measure very high resistance?

  • tape measure
  • ammeter
  • meg ohmmeter
  • voltmeter

11: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

12: A run capacitor is wired in series with the _____ windings.

  • common
  • run
  • start capacitor
  • start

13: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would have no effect on the condenser
  • it would make the condenser less efficient
  • it would make the condenser more efficient
  • it would cause the condenser to sweat

14: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • latent heat
  • specific heat
  • lost heat
  • sensible heat

15: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • sensible heat
  • evaporation of the water droplets

16: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

17: 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 a direct short
  • there's an open start winding

18: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

19: Transformers are rated in

  • volts
  • volts-ohms
  • amps
  • volt-amps

20: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

21: The Board of Boilers adopts by reference

  • MSCA Code
  • the 1997 ANSI/ASHRAE Safety Code
  • the MACS Pressure Vessel Code of Massachusetts
  • Montreal Protocol Safety Code

22: What does an anemometer measure?

  • velocity
  • temperature
  • voltage
  • amperage

23: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • overcharge of oil
  • leaking discharge valves in the compressor
  • plugged drier

24: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

25: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above