Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

2: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 33
  • 22
  • 18
  • 50

3: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed
  • shall be inspected by the Boiler of Inspectors bi-annually

4: 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.

5: How many refrigerant classifications are there for toxicity?

  • 3
  • 1
  • 2
  • 5

6: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Dry bulb temperature
  • Saturated temperature
  • Critical temperature
  • Wet bulb temperature

7: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

8: Ammonia vaporization takes place at what temperature?

  • -32F
  • -28F
  • -460F
  • -110F

9: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • splurge
  • merge
  • purge
  • surge

10: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UV”
  • “U” or “UM”
  • “UL”

11: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • The rate of conduction
  • 1 Kelvin
  • 1 Therm
  • 1 BTU

12: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • animal, vegetable, and castor

13: Which of the following is an example of an azeotropic refrigerant?

  • R-134A
  • R-404A
  • R-410A
  • R-500

14: What is a Category "D" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems

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

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

16: The two float-type metering devices are the

  • liquid float and the low-side float
  • vapor float and the low-side float.
  • high-side float and the low-side float
  • liquid float and the vapor float

17: What is Trichlorotrifluoromethane?

  • R-113
  • R-12
  • R-13
  • R-11

18: What does an anemometer measure?

  • amperage
  • temperature
  • voltage
  • velocity

19: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

20: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

21: Electricity involves the movement of electrons in atoms

  • True
  • False

22: The proper location for an oil separator is between the

  • evaporator and compressor
  • compressor and condenser
  • receiver and metering device
  • condenser and receiver

23: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

24: "E" represents _____ in the Watt's law formula.

  • watts
  • voltage
  • reactance
  • amperage

25: In a motor, an internal overload might open if

  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an open start winding
  • there's an excess current draw through the motor
  • there's a direct short