Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

2: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • public assembly occupancy
  • institutional occupancy
  • commercial occupancy
  • illegal occupancy

3: Refrigerant restricted in 2004 but used for transition for decades:

  • R-11
  • R-123
  • R-134A
  • R-22

4: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Low Pressure displacement
  • Pressure induced displacement.
  • Non-positive displacement
  • Positive displacement

5: E = I X R is

  • Ohms Law
  • Impedance Law
  • Amps Law
  • Watts Law

6: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

7: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • junction
  • parallel
  • series

8: A restaurant is classified as a

  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy
  • large mercantile occupancy

9: Crankcase heaters are energized

  • to prevent compressor freeze-up
  • while the compressor is running
  • when the compressor is off
  • to allow easy compressor start-up

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

  • voltmeter
  • tape measure
  • ammeter
  • meg ohmmeter

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

  • start capacitor
  • run
  • start
  • common

12: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe as you would measure it plus 25% for fittigns

13: Name three things that must be done when changing refrigeration lubricant?

  • You can't change lubricants.
  • Nothing must be done
  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ

14: What kind of material can't be used on the outlet of a relief valve?

  • Stainless Steel
  • Copper
  • Aluminum
  • PVC

15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

16: A Low-Probability System

  • 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 can not enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space

17: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-2
  • B-1
  • A-1

18: B3 refrigerants are considered

  • toxic but non-flammable
  • toxic and highly flammable
  • non-toxic but non-flammable
  • non-toxic but flammable

19: Brazed joints melt at temperatures above

  • 500F
  • 1,200F
  • 1,000F
  • 800F

20: 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

21: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • centrifugal switch
  • duel-voltage switch
  • printed circuit board (PCB)

22: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 6.6 lbs
  • 13.9 lbs
  • 44 lbs

23: What refrigerant is an inorganic compound?

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

24: The main purpose of the accumulator is to

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

25: Volts x amps equals

  • Ohms Law
  • Inductance
  • Watts
  • Impedance