Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A moisture indicator must

  • be yellow
  • be sight side up
  • be filled with liquid
  • change color when exposed to moisture

2: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

3: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • immersion controller
  • aquastat
  • low voltage t-stat
  • line voltage t-stat

4: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

5: When an inspection is needed, how often must it be done?

  • annually
  • every 18 months
  • every 36 months
  • every 24 months

6: How many different groups of refrigerants are there?

  • 7
  • 15
  • 3
  • 11

7: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UV or UR
  • UL and UM
  • UL and UR
  • UM or UL

8: The color code of a tank of ammonia is

  • lavender
  • silver
  • light green
  • white

9: A restaurant is classified as a

  • mixed occupancy
  • public assembly occupancy
  • large mercantile occupancy
  • commercial occupancy

10: What is an example of institutional occupancy?

  • Shopping mall
  • Dorms
  • Hospital
  • Football stadium

11: Which creates more of a heat load?

  • 70% RH
  • 30% RH
  • 50% RH
  • 90% RH

12: Where is the high-side float located on a chiller system?

  • flash line
  • inside the chiller barrel
  • discharge line
  • liquid line

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

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

14: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% distilled water
  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% tap water

15: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 100
  • 1,000
  • 10,000
  • 100,000

16: 1 HP = ____ Watts?

  • 746
  • 3.1416
  • 11,239
  • 3,412

17: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • low head pressure
  • moisture in the system
  • not enough oil in the system
  • oil in evaporator

18: A capacitor in series with the start windings will do what?

  • Increase run efficiency by 10% of its rating
  • Nothing
  • Increase starting torque
  • Decrease the RLA to within 10% of its rating

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

  • Isothermal
  • Adiabatic
  • Volume Temperature
  • Pressure Temperature

20: 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

21: How is bring measured?

  • hydrometer
  • anemometer
  • manometer
  • hygrometer

22: R-123 belongs to Group

  • B-2
  • B-1
  • B-3
  • A-3

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

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

24: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 29F
  • 11F
  • 9F
  • 21F

25: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 27 ohms
  • 71 ohms
  • 104 ohms
  • 80 ohms