Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The freezing point of water at sea level is?

  • 32C
  • 0F
  • 32F
  • -10C

2: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 14 AWG
  • 12 AWG

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

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

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

5: 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.

6: 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

7: Three-phase motors have what type of windings?

  • three run windings and 3 start windings
  • one start winding and one run winding.
  • three start windings
  • three run windings

8: What refrigerant were phased out in 2004?

  • R-134a
  • R-12
  • R-11
  • R-22

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

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

10: When must refrigeration system covered by the code be inspected?

  • Upon installation
  • Not required
  • Annually and when installed
  • Annually

11: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection as well as a temperature protection device
  • over pressure protection
  • over pressure protection and a rupture disc

12: What section of ASHRAE-15 governs pressure vessels?

  • Section 7 ASHRAE-15 ASME VIII fired
  • Section 6 ASHRAE-34 ASME VIII unfired
  • OSHA
  • Section 9 ASHRAE-15 ASME VIII unfired

13: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • ammonia
  • HCFC-123
  • CFC-11
  • Lithium bromide

14: On a single phase motor, when does the start winding cut out?

  • At 75% of its full rated speed
  • At 50% of its full rated speed
  • Start windings do no cut-out of the run cycle
  • At 25% of its full rated speed

15: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 38
  • 108
  • 116
  • 88

16: Trichlorofluoromethane is the name of what refrigerant?

  • R-502
  • R-12
  • R-113
  • R-11

17: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type K
  • Type N
  • Type L

18: A class B1 refrigerant is considered

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

19: Excessive head pressure is often caused by

  • air cooled condenser is plugged
  • insufficient refrigerant
  • leaking reed valve on the discharge side
  • thermostat set too high

20: If an oil’s floc point is too high, which of the following could occur?

  • plugged expansion valve
  • compressor burn out
  • low head pressure
  • high suction pressure

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

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

22: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 25%
  • 2%

23: R-123 belongs to Group

  • B-1
  • B-3
  • B-2
  • A-3

24: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 20
  • 25
  • 10
  • 15

25: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall be allowed to be used for human comfort.
  • shall not be used for air condition for human comfort