Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A mercury bulb controller is not recommended for

  • use where vibration is severe
  • low voltage use
  • line or low voltage use
  • line voltage use

2: A relief valve discharge capacity is rated in

  • Pounds of air per minute.
  • PSIG
  • PSIA
  • temperature minus pounds of air per second divided by release rate squared

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

  • watts
  • voltage
  • reactance
  • amperage

4: 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

5: Adjusting the spring pressure on a TXV

  • changes subcooling
  • makes no difference
  • adjusts the bulb charge
  • changes superheat

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

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

7: Class 3 refrigerants are

  • non-flammable
  • highly flammable
  • toxic
  • non-toxic

8: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 3
  • 2
  • 5
  • 1

9: Crankcase heaters are energized

  • while the compressor is running
  • to prevent compressor freeze-up
  • to allow easy compressor start-up
  • when the compressor is off

10: Ammonia is under what safety classification?

  • B2
  • B3
  • B1
  • A3

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

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

12: How much refrigerant can be stored in a mechanical room outside of the system?

  • 200
  • 100
  • 150
  • 330

13: A class B2 refrigerant is considered

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

14: The critical temperature of a refrigerant gas occurs when

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

15: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

16: Which oil is hydoscopic?

  • SW30
  • mineral
  • animal
  • polyolester

17: 1 Watt = ______ BTU's?

  • 4.482
  • 12
  • 3.412
  • 7.216

18: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • business occupancy
  • public assembly occupancy.
  • commercial occupancy
  • mercantile occupancy

19: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

20: On a centrifugal compressor, stationary diffuser vanes are needed to

  • prevent high pressure on the packing
  • stop gas flow
  • increase the clearance space
  • convert velocity energy to pressure

21: The Board of Boilers adopts by reference

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

22: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 1/2"
  • 5/8"
  • 3/8"
  • 3/4"

23: 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

24: Pi equals approximately

  • 12,000
  • 746
  • 3.14
  • 3.41

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

  • phsycometirc
  • manometer
  • pyrometer
  • anemometer