Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Two systems using separate refrigerants that are superimposed upon one another is called

  • cascade
  • single stage
  • indirect
  • booster

2: Large mercantile occupancy is

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

3: R-11 has the greatest corrosive effect on

  • Aluminum
  • Magnesium
  • Bronze
  • Copper

4: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

5: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Prevailing winds
  • Dirty Coil
  • Dirty fan blades

6: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • two tons of cooling
  • three tons of cooling
  • one ton of cooling

7: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?

  • Relief valve
  • Circuit Breaker
  • Temperature limiter device
  • T&P device

8: A EPR valve is installed on what type of evaporators?

  • plate evaporators
  • shell and tube evaporators
  • high-temperature evaporators
  • low-temperature evaporators

9: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Self-closing, aligned, fire door
  • Steel, approved, weather-stripped
  • Self-closing, wooden, fire door

10: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-1
  • A-1
  • A-2
  • B-2

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

  • anemometer
  • refractometer
  • Psychrometer
  • hydrometer

12: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 65 lbs
  • 120 lbs
  • 55 lbs

13: A chiller entering and leaving temperature difference is?

  • 50 degrees F
  • 10 degrees F
  • 5 degrees F
  • 20 degrees F

14: What is the minimum size wire you can use on a 30 amp circuit?

  • 12 AWG
  • 14 AWG
  • 10 AWG
  • 16 AWG

15: An oil pressure safety switch should be set at

  • 5 to 10 psi above low side pressure
  • 5 to 10 psi below low side pressure
  • 10 to 15 psi below low side pressure
  • 10-15 psi above low side pressure

16: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the coolest evaporator
  • Suction line prior to the accumulator of the lowest temperature system
  • Suction line of the warmest evaporator
  • Suction line at the compressor

17: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • pre-rotational guide vanes
  • check valves
  • post-rotational guide vanes

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

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

19: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Pressure Temperature
  • Adiabatic
  • Isothermal

20: Who is permitted to access a refrigeration machine room?

  • Authorized persons only
  • Contractors only
  • Anyone, it's a completely safe area
  • Any employee

21: A thermometer inside a duct measures ____ heat.

  • specific
  • hidden
  • sensible
  • latent

22: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

23: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 1250
  • 2
  • 2.5
  • There isn't enough information to answer.

24: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

25: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • safe access
  • manufactures instructions on start-up procedures
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code