Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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)?

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

2: Give an example of a secondary coolant?

  • R-12
  • R-410A
  • R-717
  • R-718

3: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • aquastat
  • immersion controller
  • line voltage t-stat
  • low voltage t-stat

4: What is the minimum height refrigeration piping should be placed against walls?

  • 6'
  • Ceiling height
  • 72"
  • 7.25'

5: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

6: Clearance volume

  • varies depending on compressor speed
  • has no effect on compressor capacity
  • affects compressor capacity
  • is the same on all compressors

7: 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

8: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA
  • Section 8 ASHREA 15 ASME unfired

9: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • A group sensing
  • refrigerant sensing
  • CO Sensing
  • phosgene gas sening

10: How far from the window does a relief valve need to be according to ASHRAE-15?

  • There is no minimum for relief valve and windows.
  • At least 40'
  • At least 30'
  • At least 20'

11: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 500 lbs
  • 660 lbs
  • 330 lbs

12: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

13: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the condenser water circulator pump
  • speed of the chilled water circulatory pump
  • rate at which heat is supplied to the generator
  • pressure setting on the system's rupture disc

14: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • critical pressure
  • high pressure
  • low pressure
  • design pressure

15: The Board of Boilers adopts by reference

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

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

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

17: A direct system

  • is a self-contained complete factory made and tested system
  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated

18: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 32F
  • 45F
  • 158F
  • 155F

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

  • 1%
  • 4%
  • 2%
  • 25%

20: Electricity involves the movement of electrons in atoms

  • True
  • False

21: 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

22: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 10
  • 15
  • 20
  • 25

23: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 226 psig, 68 psig
  • 350 psig, 120 psig
  • 455 psig, 185 psig
  • 257 psig, 77 psig

24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 55 lbs
  • 550 lbs
  • 330 lbs.

25: How many BTU's is produced by one watt of energy

  • 3.41
  • 3.00
  • 1
  • 2.57