Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • negative displacement compressor
  • neutral chamber-type compressor
  • non-volumetric displacement compressor

2: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

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

  • 1.2
  • .8
  • .1
  • 1.7

4: What type of relief valve is used on a CO2 system?

  • fusible plug
  • rupture disc
  • glove disc
  • gate valve

5: 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)?

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

6: The density of a gas refers to

  • pounds per square foot
  • pounds per cubic foot
  • pounds per absolute pressure
  • cubic feet per pound

7: Where must a refrigeration contractor's license number be displayed?

  • Uniforms, checks, and invoices.
  • Trucks, license plates, and uniforms
  • Truck, office, every job, and on all equipment
  • Trucks, invoices, and advertising

8: How many refrigerant classifications are there for flammability?

  • 1
  • 2
  • 7
  • 3

9: How many gallons of water per pound of ammonia do you need?

  • 15
  • 20
  • 1
  • 5

10: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 4
  • 2
  • 5
  • 3

11: What is the refrigerant dichlorodifluoromethane?

  • R-123
  • R-134A
  • R-22
  • R-12

12: Pi equals approximately

  • 3.14
  • 3.41
  • 12,000
  • 746

13: Indirect systems using Group II refrigerants

  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system less than 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room

14: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

15: A self contained system

  • is a unit system Group II refrigerants only
  • is a complete factory made and tested system
  • is any system or part of a system used to increase evaporation by expansion or vaporization
  • is a unit system Group I refrigerants only

16: R-11 has the greatest corrosive effect on

  • Bronze
  • Copper
  • Aluminum
  • Magnesium

17: How many CFMs are required per square foot of commercial office occupied space

  • .5 CFM
  • 20 CFM
  • 15 CFM
  • 5 CFM

18: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 58F
  • 55F
  • 45F
  • 32F

19: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 2%
  • 25%
  • 1%
  • 4%

20: If the power element of an expansion valve should lose its charge the valve would

  • go open
  • overfeed the evaporator
  • underfeed the evaporator
  • go closed

21: When a refrigeration or air conditioning system is installed

  • the form of certificate shall be authorized by the Department of Pubic safety
  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • it shall not be operated below prescribed pressures

22: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • remain in the air
  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump

23: Which refrigerant replaced R-12?

  • R-134A
  • R-410A
  • R-407A
  • R-22

24: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • No, never
  • Yes, Under certain condidtions
  • Yes, always

25: Bubbles in the liquid line sight glass could be caused by

  • leaking discharge valves in the compressor
  • overcharge of oil
  • plugged drier
  • bad low pressure switch