Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

2: Brazed joints melt at temperatures above

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

3: What pipe can not be used for refrigeration?

  • N
  • L
  • M
  • K

4: Where a refrigeration or air conditioning system is installed,

  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • it shall not be operated below prescribed pressuers
  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety

5: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 330 lbs.
  • 660 lbs
  • 550 lbs
  • 55 lbs

6: Liquid line filter-driers on a 410A system must be rated for no less than

  • 1000 psig
  • 600 psig
  • 200 psig
  • 400 psig

7: What is the refrigerant dichlorodifluoromethane?

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

8: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

9: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

10: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 15%
  • 20%
  • 10%

11: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

12: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

13: Refrigerants shall be classified by

  • maximum permissible quantities of each group
  • color codes
  • requirements for commercial, industrial, and residential occupancies
  • toxicity and flammability

14: Sensible heat is the heat added to a substance to

  • change its state
  • freeze it
  • raise its temperature
  • cause evaporation

15: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with R-11
  • Flush with RX-11
  • Flush with ammonia
  • Flush with R-718

16: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid
  • the gas is no longer saturated
  • any decrease in pressure will cause condensation

17: A self contained system

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

18: A secondary coolant is defined as

  • 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
  • any refrigerant direcly in contact with the cooling space for process cooling

19: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UV”
  • “U” or “UM”
  • “UL”

20: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

21: Ammonia can come in contact with _______ ?

  • Copper tubing
  • Aluminum
  • Brass
  • Copper

22: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • up to 1,000 ohms
  • up to 1,000,000 ohms
  • 10,000,000 ohms or higher

23: Relief valves are rated in

  • pounds of air per hour
  • gallons of water per minute
  • gallons of water per hour
  • pounds of air per minute

24: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent-length of fittings

25: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above