Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

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

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

3: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 1.5
  • 2.2
  • 1

4: What refrigerant doesn't have to be classified?

  • R-134A
  • R-717
  • R-422A
  • R-718

5: R-11 has the greatest corrosive effect on

  • Magnesium
  • Copper
  • Aluminum
  • Bronze

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

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

7: What would be the classification for Stop & Shop grocery store?

  • Instituional
  • Large mercantile
  • Industrial
  • Place of assembly

8: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • the liquid side of the system
  • high side of the system
  • low side of the system
  • the vapor side of the system

9: A secondary coolant is defined as

  • any refrigerant direcly in contact with the cooling space for process cooling
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
  • a low temperature refrigerant used for cascading systems

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

  • 5
  • 3
  • 2
  • 4

11: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • automatic ventilation
  • self-closing doors
  • tight fitting doors

12: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Air
  • Heat
  • Electricity
  • Oil

13: A micron is

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

14: How many forces operate a thermostatic expansion valve?

  • 2
  • 3
  • 4
  • 1

15: The location of a thermal bulb of a TXV affects

  • subcooling
  • the amount of liquid refrigerant in the evaporator
  • the amount of liquid in the condenser.
  • the amount of liquid returning to the compressor

16: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line

17: Stop valves shall not be permitted between the system and the

  • condenser
  • service valve
  • relief valve
  • bleed valve

18: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • insulated
  • leak checked
  • moisture barrier

19: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

20: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

21: 746 watts is equal to

  • 1 hp
  • 10 hp
  • Pi
  • 100 hp

22: A tachometer is an instrument used to measure

  • speed
  • static pressure
  • RPM
  • air velocity

23: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

24: 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

25: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above