Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Dry bulb temperature
  • Critical temperature
  • Wet bulb temperature
  • Saturated temperature

2: A High-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space

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

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

4: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

5: What device should be used on low-temperature freezers?

  • high capacity TXV
  • oil separator
  • discharge muffler
  • hot-gas by-pass

6: How many square inches per square foot?

  • 98
  • 64
  • 144
  • 24

7: Ammonia can come in contact with _______ ?

  • Aluminum
  • Copper tubing
  • Brass
  • Copper

8: Indirect systems using Group II refrigerants

  • shall be used in refrigeration system less than 1,000 lbs
  • shall be used for mechanical equipment only
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system in excess of 1,000 lbs

9: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

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

  • 2
  • 4
  • 1
  • 3

11: Pipe identification labels are required when the system contains more than

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

12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

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

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

14: Start to Run windings will have what resistance?

  • The most resistance value
  • Somewhere between the actual start winding and run winding resistance value
  • The least resistance value
  • All will be at equal values

15: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 75%
  • 90%

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

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

17: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

18: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above

19: In a system designed for sub-zero ambient temperatures, what must be added?

  • Infrared dye for leak identification
  • Low-ambient kit
  • Nitrogen
  • Booster compressor

20: When energized, a normally open relay will be

  • closed
  • depends on the type and class of the relay
  • open
  • noisy

21: Control systems can be classified by

  • safety
  • source of power
  • tonnage of system
  • economy of operation

22: What is not a requirement of a Class T machine room?

  • Tight fitting doors
  • Self-closing doors
  • Fire hose connected to the building fire protection system.
  • Automatic ventilation

23: A Lithium-bromide system is an absorption system that

  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent

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

  • copper
  • black iron
  • magnesium
  • stainless steel

25: 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