Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

2: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 96
  • 38
  • 88
  • 58

3: A low oil switch is typically

  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity
  • manual reset
  • automatic reset

4: Pi equals approximately

  • 3.14
  • 12,000
  • 746
  • 3.41

5: What is used to check very low air pressures in air conditioning duct?

  • Manometer
  • Barometer
  • Vacuum gauge
  • Anemomter

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

  • Leak tested
  • Pressurized
  • Insulated
  • Inspected

7: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices

8: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 120v
  • 208v
  • 240v
  • 277v

9: A class B1 refrigerant is considered

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

10: What measures gas pressure?

  • Hygrometer
  • Barometer
  • Manometer
  • Hydrometer

11: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 365 psig
  • 255 psig
  • 125 psig
  • 327 psig

12: When an electronic bridge is in balance the bridge output will be

  • .01 volts
  • 1 volt
  • 0 volts
  • 15 volts

13: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

14: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • weak solution
  • absorbed solution
  • concentrated solution
  • strong solution

15: What refrigerant were phased out in 2004?

  • R-22
  • R-11
  • R-134a
  • R-12

16: How many refrigerant classifications are there for flammability?

  • 2
  • 3
  • 1
  • 7

17: What is the amp draw of a 40 VA transformer at 24 volts

  • 106 amps
  • 1K amps
  • 1,000 amps
  • 1.6 amps

18: 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.

19: What would be the classification of a prison?

  • Place of assembly
  • Large mercantile
  • Institutional
  • Industrial

20: How many volts would you read on a 480V system phase to phase?

  • 0
  • 480
  • 1/3 the voltage
  • 277

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

  • 1.2
  • 2.2
  • 1.5
  • 1

22: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

23: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • At least 15' above grade
  • At least 20' above grade
  • Not more than 3' above grade

24: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

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