Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-11
  • R-12
  • R-22

2: Refrigerants shall be classified by

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

3: Ammonia (NH3) is a group III refrigerant

  • True
  • False

4: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 226 psig, 68 psig
  • 257 psig, 77 psig
  • 455 psig, 185 psig.
  • 365 psig, 120 psig

5: The main purpose of the accumulator is to

  • provide space for vapor to accumulate
  • prevent liquid slugs at the compressor
  • provide space for the accumulation of oil and containminants
  • store liquid refrigerant

6: Capacitors are rated in

  • kelvins
  • volt - amperes
  • micro-farads
  • megaohms

7: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable
  • toxic but non-flammable

8: 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

9: Joints in refrigeration piping must be _____ before being covered?

  • Pressurized
  • Inspected
  • Insulated
  • Leak tested

10: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

11: What type of relief valve is used on a CO2 system?

  • fusible plug
  • gate valve
  • rupture disc
  • glove disc

12: Cooling tower lowers condenser water temp by

  • running water thru a secondary heat exchanger
  • running fans at 100%
  • condensation
  • evaporative cooling

13: What is NOT a positive displacement compressor.

  • Rotary
  • Reciprocating
  • Scroll
  • Centrifugal

14: The reversing valve is commonly used

  • on commercial system that involve two different temperatures
  • when the code requires a check valve
  • on multiple compressor systems
  • on all heat pumps

15: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • start the fan and circulating pump
  • reset the expansion valve
  • reset the safety valve

16: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • too small evaporator
  • starved evaporator
  • compressor suction valve stuck open
  • overcharged

17: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

18: Two systems using separate refrigerants that are superimposed upon one another is called

  • booster
  • cascade
  • indirect
  • single stage

19: A professional or office building would be considered what type of occupancy?

  • business
  • public assembly
  • commercial
  • mercantile

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

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

21: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

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

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

23: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • safe access
  • manufactures instructions on start-up procedures

24: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

25: Which of the following is NOT a positive displacement compressor?

  • reciprocating
  • screw
  • scroll
  • centrifugal