Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

2: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

3: A relief valve shall be located at least ___ above grade.

  • 10'
  • 25'
  • 36'
  • 15'

4: What is the refrigerant chlorodifluoromethane?

  • R-12
  • R-123
  • R-134a
  • R-22

5: Horizontal piping should be run level.

  • No, unless the supervisor on the job says so.
  • False
  • True
  • Yes, if the condenser is located above the evaporator

6: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • critical pressure
  • high pressure
  • design pressure
  • low pressure

7: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

8: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

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

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

10: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices

11: Secondary refrigerants are usually

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

12: A water regulating valve opens when

  • when the power is on there is an overcharge of refrigerant
  • the head pressure rises
  • the compressor is on
  • when the power is on

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

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

14: The generator shell contains the

  • condenser, the evaporator, and the generator
  • condenser and the generator
  • condenser and the absorber
  • evaporator and the absorber

15: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

16: Class 3 refrigerants are

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

17: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

18: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • sensible heat
  • evaporation of the water droplets

19: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and unbalanced head and friction head
  • GPM and friction head
  • GPM and balanced head and friction head
  • GPM, pipe size, and equivalent head.

20: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 20 amps
  • 10 amps
  • 24 amps

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

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

22: When should a relief valve start to function?

  • At it's set pressure
  • Two times it's working pressure
  • Before the purge station discharges
  • 10 psi before it's set pressure

23: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Latent heat
  • Specific heat
  • Sensible heat
  • Enthalpy

24: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • high head pressure
  • low suction pressure
  • increased capacity

25: What refrigerant were phased out in 2004?

  • R-134a
  • R-22
  • R-12
  • R-11