Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • 30F to 50F
  • -100F to -40F
  • 0F-38F
  • -40F to 0F

3: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

4: Booster compressors connect to the ____ side of the compressor

  • vapor
  • low side
  • oil side
  • liquid

5: How many refrigerant classifications are there for flammability?

  • 3
  • 7
  • 2
  • 1

6: When energized, a normally open relay will be

  • noisy
  • depends on the type and class of the relay
  • open
  • closed

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

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

8: A split-phase motor has a ______ winding and a ____ winding

  • duel-run, duel-start
  • run, common
  • start, common
  • run, start

9: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • welder qualified
  • licensed technician
  • competent welder
  • licensed welder

10: The actual expansion curve of compressor follows most nearly which one of the following

  • Pressure-Temperature
  • Adiabatic
  • Volume
  • Isothermal

11: Fusible plugs shall not be used with pressure vessels of

  • 15 square feet or less
  • 3 cubic feet or less
  • 15 cubic feet or more
  • 3 cubic feet or more

12: The evaporator is a device to

  • store liquid refrigerant
  • remove heat from the refrigeration system
  • Keep the compressor busy
  • absorb heat into the refrigeration system

13: A motor starter contains a thermal overload and a

  • contactor
  • transformer
  • 3-way relay
  • solenoid

14: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

15: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

16: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • king valves
  • gate or globe valves
  • ball valves
  • companion or block valves

17: Where a refrigeration or air conditioning system is installed,

  • the form or certificate shall be authorized by the Department of Public Safety
  • it shall not be operated below prescribed pressuers
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service

18: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 1.5
  • 2.2
  • 1

19: Suction valve unloaders afford an effective means of

  • capacity control
  • refrigerant control
  • evaporator control
  • superheat control

20: All electrical work done on refrigeration systems must comply with

  • ASHREA-15 Section 9.2.1
  • OSHA
  • NEC and Massachusetts Modifications
  • Department of Energy

21: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • low voltage t-stat
  • line voltage t-stat
  • immersion controller
  • aquastat

22: Secondary refrigerants are usually

  • water or brine
  • alcohol
  • Prestone anti-freeze
  • expensive

23: Class T machine room

  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room

24: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • printed circuit board (PCB)
  • centrifugal switch
  • duel-voltage switch

25: Fractionation occurs when

  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • the pressures increase as the heat load increases
  • the pressures decreases as the heat load decreases
  • when a fraction of refrigerant is added as the full charge