Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Refrigerant restricted in 2004 but used for transition for decades:

  • R-22
  • R-123
  • R-11
  • R-134A

2: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 15 amps
  • 10 amps
  • 5 amps
  • 20 amps

3: Transformers are rated in

  • volts-ohms
  • amps
  • volt-amps
  • volts

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

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

5: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

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

  • True
  • False

7: Which creates more of a heat load?

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

8: In a system designed for sub-zero ambient temperatures, what must be added?

  • Booster compressor
  • Infrared dye for leak identification
  • Nitrogen
  • Low-ambient kit

9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device installed on the high side of the system
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device and a pressure relief valve installed
  • does not require a pressure-limiting device

10: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • rupture plug
  • fusion plug
  • relief plug
  • fusible plug

11: A declaration test is needed when the system contains more than

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

12: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

13: How are refrigerant blends classified?

  • Blends don't have to be classified
  • Based on worst case fractionation
  • Based on best case Fractionation
  • Based on the oil used

14: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?

  • Moisture and air
  • Oil and water
  • Water and soap
  • Air and dirt

15: Pressure is equivalent of

  • Force / Area
  • Force X Area
  • Force
  • Area X Force

16: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 700F
  • 1000F
  • 600F

17: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

18: Ammonia (NH3) is a group III refrigerant

  • True
  • False

19: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Classifed
  • Certified
  • Insulated and installed in a pipe duct (Encased)

20: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?

  • CFM and RPM decrease
  • CFM and HP increase
  • RPM and CFM increase
  • CFM and HP decrease

21: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, paper method, and frost line.

22: A water regulating valve opens when

  • the head pressure rises
  • when the power is on
  • the compressor is on
  • when the power is on there is an overcharge of refrigerant

23: How many different groups of refrigerants are there?

  • 15
  • 3
  • 7
  • 11

24: How much clearance do you need around the perimeter of electrical panels?

  • 18"
  • 12"
  • 36"
  • 24"

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

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