Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A VRF system is a direct system

  • true
  • false

2: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

3: An air conditioning system rated for 36,000 BTU's is equivalent to

  • three tons of cooling
  • two tons of cooling
  • 12,000 tons of cooling
  • one ton of cooling

4: A movie theater would be considered a

  • institutional occupancy
  • public assembly occupancy
  • mixed occupancy
  • commercial occupancy

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

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

6: All electrical work done on refrigeration systems must comply with

  • Department of Energy
  • ASHREA-15 Section 9.2.1
  • OSHA
  • NEC and Massachusetts Modifications

7: "I" represents ____ in the Ohm's law formula.

  • capacitance
  • resistance
  • amperage
  • voltage.

8: What type of copper is not permitted on refrigeration systems?

  • Type N
  • Type M
  • Type L
  • Type K

9: Secondary refrigerants are usually

  • Prestone anti-freeze
  • alcohol
  • water or brine
  • expensive

10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 66
  • 25

11: A direct system

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

12: On a single phase motor, when does the start winding cut out?

  • At 75% of its full rated speed
  • Start windings do no cut-out of the run cycle
  • At 50% of its full rated speed
  • At 25% of its full rated speed

13: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

14: The actual expansion curve of compressor follows most nearly which one of the following

  • Volume
  • Pressure-Temperature
  • Isothermal
  • Adiabatic

15: Which occupancy can ammonia be used in?

  • industrial
  • depends on the quantity of freon
  • commercial
  • redifential

16: How are safety controls wired in a circuit?

  • Parallel
  • Series
  • Either series or parallel
  • Series/parallel

17: Which creates more of a heat load?

  • 90% RH
  • 70% RH
  • 30% RH
  • 50% RH

18: At higher altitudes, the boiling point of refrigerant is

  • equal to the coefficient of water at 32F
  • the same
  • lower
  • higher

19: The rupture disc on a low-pressure chiller typically releases pressure at

  • 15 psig
  • 0 psig
  • 5 psig
  • 10 psig

20: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices

21: 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

22: "P" represents ______ in the Watt's law formula

  • reactance
  • voltage
  • watts
  • amperage

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

  • 9F
  • 21F
  • 29F
  • 11F

24: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 100
  • 350
  • 250
  • 400

25: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the low side
  • the high side
  • the aggregate of the high side and low side
  • 2.5 times the design pressure