Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of pressure relief device is used on a CO2 system?

  • Fusible plug
  • Glove valve
  • Rupture disk
  • Gate valve

2: How many opening forces operate a thermostatic expansion valve?

  • 1
  • 4
  • 3
  • 2

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

  • 10
  • 50
  • 100
  • 1

4: What is potential measured in?

  • Volts
  • Amps
  • Henrys
  • Ohms

5: High pressure controls should be set no higher than

  • 10% of set point
  • 80% of set point
  • 90% of set point
  • 25% of set point

6: 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

7: The formula for Pure Power in a resistance circuit is

  • Watts X amps.
  • Watts = volts X amps
  • Kw = volts X amps
  • Watts X power factor

8: What is the amp draw of a 40 VA transformer at 24 volts

  • 106 amps
  • 1K amps
  • 1,000 amps
  • 1.6 amps

9: Which is considered the more efficient condenser?

  • spray cooled
  • fan cooled
  • air cooled
  • water cooled

10: 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.

  • ammonia
  • Lithium bromide
  • CFC-11
  • HCFC-123

11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • business occupancy
  • mercantile occupancy
  • public assembly occupancy.
  • commercial occupancy

12: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 7.25'
  • 7.00'
  • 8'4"
  • 9.00'

13: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • high suction pressur
  • low oil pressure
  • low suction pressure

14: The main purpose of the accumulator is to

  • prevent liquid slugs at the compressor
  • store liquid refrigerant
  • provide space for the accumulation of oil and containminants
  • provide space for vapor to accumulate

15: Which of the following is not an air velocity meter?

  • Anemometer
  • Hydrometer
  • Velometer
  • Anemotherm

16: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

17: A high side float is a

  • float type valve that controls the amount of refrigerant stored in the receiver
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the crankcase oil level

18: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

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

  • voltmeter
  • meg ohmmeter
  • tape measure
  • ammeter

20: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

21: A hissing noise at the expansion valve is a good indication that

  • liquid is passing thru it
  • nothing is passing thru
  • expansion valve is oversized
  • gas is passing thru it

22: A declaration test is needed when the system contains more than

  • 55 lbs
  • 120 lbs
  • 110 lbs
  • 65 lbs

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

  • there's a direct short
  • 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

24: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of the liquid line
  • outlet of high temperature evaporator
  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.

25: 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