Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • 1.7
  • .1
  • 1.2
  • .8

2: What does an anemometer measure?

  • amperage
  • velocity
  • temperature
  • voltage

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

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

4: The oil separator is always inserted in the system

  • where it can be easily serviced
  • in the discharge line
  • in a cool spot
  • to prevent oil logging

5: Before replacing a seized compressor, the _______ should be determinded.

  • cause of seizure
  • current draw
  • designed head pressure
  • type of refrigerant

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

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

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

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

8: 1 HP = ____ Watts?

  • 3.1416
  • 11,239
  • 746
  • 3,412

9: _____ and its alloys are suitable for use with ammonia systems.

  • Copper
  • Magnesium
  • Aluminum
  • Zinc

10: Which refrigerant replaced R-12?

  • R-407A
  • R-22
  • R-134A
  • R-410A

11: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection
  • shall use fusible plugs
  • shall use pressure relief devices

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

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

13: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • must be reset manually
  • never trips
  • resets itself automatically

14: Each machinery room shall contain

  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • high and low pressure controls
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate

15: A class B1 refrigerant is considered

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

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

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

17: What must be done to refrigerant pipes before being buried?

  • Coated
  • Certified
  • Encased
  • Leaked checked

18: What device measures the specific gravity of a substance?

  • Hygrometer
  • Thermometer
  • Hydrometer
  • Manometer

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

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

20: The critical temperature of a refrigerant gas occurs when

  • the gas returns to a liquid
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation

21: A direct system

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

22: "I" represents _______ in the Watt's law formula.

  • reactance
  • watts
  • amperage
  • voltage

23: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 55
  • 50
  • 15
  • 75

24: All serviceable components of a refrigeration system shall be provided with

  • safe access
  • manufactures instructions on start-up procedures
  • service manuals
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code

25: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will thicken
  • oil level will rise
  • oil will foam