Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia belongs to Group

  • A-1
  • B-1
  • B-2
  • A-2

2: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

3: A professional or office building would be considered what type of occupancy?

  • mercantile
  • business
  • commercial
  • public assembly

4: Liquid line filter-driers on a 410A system must be rated for no less than

  • 600 psig
  • 1000 psig
  • 200 psig
  • 400 psig

5: A positive displacement compressor is

  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

6: Liquid level gauges must be provided with what?

  • A relief valve
  • A red line
  • A low level mark
  • Automatic shut-offs

7: How much clearance do you need around the perimeter of electrical panels?

  • 24"
  • 12"
  • 18"
  • 36"

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

  • Hygrometer
  • Manometer
  • Thermometer
  • Hydrometer

9: A device used to measure small pressure differences is the

  • manometer
  • phsycometirc
  • anemometer
  • pyrometer

10: What type of relief valve is used on a CO2 system?

  • gate valve
  • fusible plug
  • glove disc
  • rupture disc

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

  • 3.41
  • 2.57
  • 1
  • 3.00

12: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

13: The freezing point of water at sea level is?

  • 32F
  • 32C
  • 0F
  • -10C

14: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • a ling psychrometer doesn't have two theremometers.
  • 2F difference
  • nearly the same
  • far apart or greater difference

15: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 66F
  • 45F
  • 55F

16: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

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

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

18: Indirect systems using Group II refrigerants

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

19: Each machinery room shall contain

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

20: A High-Probability System

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

21: Which refrigerant is lighter than air?

  • R-717
  • R-134a
  • R-123
  • R-11

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

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

23: Refrigerants shall be classified by

  • toxicity and flammability
  • maximum permissible quantities of each group
  • requirements for commercial, industrial, and residential occupancies
  • color codes

24: Single compound Refrigerants are classified by what two criteria?

  • Flammability and toxicity
  • Weight and color
  • Temperature range and hazardousness
  • Flammability and temperature range

25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 15
  • 18
  • 24
  • 10