Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Contractor who last serviced the system.
  • Person who pulled the permit
  • Board of Boilers

2: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 75%
  • 90%
  • 99%

3: How are a compressor and condenser fan wired?

  • parallel
  • parallel-series
  • series
  • series-parallel

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

  • Latent heat
  • Specific heat
  • Enthalpy
  • Sensible heat

5: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • cooling temperature set-point
  • opening at the pump inlet
  • adjustment of the spring tension of the TXV
  • opening at the pump outlet

6: Suction valve unloaders afford an effective means of

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

7: Dew point is

  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense

8: R-123 belongs to Group

  • B-2
  • B-3
  • A-3
  • B-1

9: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • Lithium bromide
  • HCFC-123
  • CFC-11
  • ammonia

11: one BTU equals

  • 31.4 hp
  • 12,000 hp
  • 3.41 hp
  • Pi

12: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • Psychrometer
  • anemometer
  • hydrometer
  • refractometer

13: The absorber shell contains the

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

14: What is the state of the refrigerant leaving the evaporator?

  • a low temperature subcooled liquid
  • a high temperature superheated vapor
  • low temperature superheated vapor
  • a high temperature subcooled liquid

15: How far from the ground does a relief valve need to be?

  • At least 15' above grade
  • Not more than 3' above grade
  • At least 25' above grade
  • At least 20' above grade

16: A micron is

  • one thousandths of a millimeter
  • one millonths of a micrometer
  • a larger unit of measurement than Hg
  • one millonths of a centimeter

17: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Rotating vanes
  • Suction and discharge valves
  • Nesting scrolls
  • Fan-like action

18: A motor starter contains a thermal overload and a

  • contactor
  • solenoid
  • transformer
  • 3-way relay

19: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 45
  • 38
  • 66

20: 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

21: A hissing noise at the expansion valve is a good indication that

  • gas is passing thru it
  • liquid is passing thru it
  • expansion valve is oversized
  • nothing is passing thru

22: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • lost heat
  • latent heat
  • specific heat
  • sensible heat

23: On a pumpdown system, the liquid-line solenoid is controlled by the

  • thermostat
  • low-ambient controller
  • low pressure switch
  • defrost timer

24: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

25: 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