Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: On a single phase motor, when does the start winding cut out?

  • 50% of its RLA speed
  • 75% of its RLA speed
  • 25% of its RLA speed
  • 100% of its RLA speed

2: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

3: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 24
  • 100
  • 50

4: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

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

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

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

  • 55F
  • 58F
  • 32F
  • 45F

7: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 BTU
  • 1 Therm
  • 1 Kelvin
  • The rate of conduction

8: Can you use Ammonia in industrial applications?

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

9: Horizontal piping should be run level.

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

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

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

11: What device measures the specific gravity of a substance?

  • Manometer
  • Thermometer
  • Hydrometer
  • Hygrometer

12: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 720,000
  • 200
  • 12,000

13: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

14: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • green
  • blue
  • red
  • orange

15: An accumulator can be located between the

  • condenser and evaporator
  • first stage and second stage compressors
  • compressor and condenser
  • evaporator and compressor

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

  • refractometer
  • hydrometer
  • Psychrometer
  • anemometer

17: Humidity can be sensed with

  • human hair
  • bimetal
  • pressure bellows
  • thermometer

18: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 1
  • 2
  • 3
  • 5

19: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

20: What pipe can not be used for refrigeration?

  • N
  • M
  • K
  • L

21: Copper and its alloys shall not be used with ammonia

  • True
  • False

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

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

23: When energized, a normally open relay will be

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

24: Brazed joints melt at temperatures above

  • 1,000F
  • 1,200F
  • 800F
  • 500F

25: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 10
  • 15
  • 25
  • 20