Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the return air ducted system
  • the outdoors
  • Machinery rooms need not be vented
  • the mechanical room housing the refrigeration system

3: Ammonia vaporization takes place at what temperature?

  • -460F
  • -110F
  • -32F
  • -28F

4: A Lithium-bromide system is an absorption system that

  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent
  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses water as a absorbent and lithium bromide as a refrigerant

5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • .9776 watts
  • 9.776 watts
  • 9,776 watts

6: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 10 cubic feet or less

7: What is used to check very low pressure?

  • Manometer
  • Velometer
  • Hygrometer
  • Hydrometer

8: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

9: What measures gas pressure?

  • Hydrometer
  • Hygrometer
  • Barometer
  • Manometer

10: The first step in mechanical refrigeration is

  • expansion
  • condensation
  • compression
  • evaporation

11: What does an anemometer measure?

  • amperage
  • velocity
  • voltage
  • temperature

12: Usually dry bulb temperature is

  • same as wet bulb temperature
  • higher than wet bulb temperature
  • not important and shall be ignored
  • lower than dry bulb temperature

13: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 27 ohms
  • 104 ohms
  • 71 ohms
  • 80 ohms

14: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

15: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • low limit control
  • high limit control

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

  • 1.2
  • .8
  • .1
  • 1.7

17: The Department that certifies the transportation of refrigerant is the

  • EPO
  • RSES
  • EPA
  • DOT

18: Adjusting the spring pressure on a TXV

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

19: The reversing valve is commonly used

  • on commercial system that involve two different temperatures
  • when the code requires a check valve
  • on multiple compressor systems
  • on all heat pumps

20: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

21: 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

22: Which winding have the most turns?

  • they have equal amount of turns
  • run
  • depends on the motor phase
  • Start

23: The Board of Boilers adopts by reference

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

24: NH3 is

  • ammonia
  • R-718
  • R-508A
  • lithium bromide

25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 330 lbs
  • 660 lbs
  • 500 lbs