Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If the power element of an expansion valve should lose its charge the valve would

  • go open
  • go closed
  • underfeed the evaporator
  • overfeed the evaporator

2: Fusible plugs shall not be used with pressure vessels of

  • 15 square feet or less
  • 15 cubic feet or more
  • 3 cubic feet or more
  • 3 cubic feet or less

3: What is an example of institutional occupancy?

  • Dorms
  • Shopping mall
  • Hospital
  • Football stadium

4: The most common type of motor starter is

  • delts-wye starter
  • duel-winding starter
  • across the line starter
  • part winding starter

5: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • False
  • are obsolete.
  • depends on the type of refrigerant being used
  • True

6: The rupture disc on a low-pressure chiller typically releases pressure at

  • 10 psig
  • 5 psig
  • 15 psig
  • 0 psig

7: Which winding have the most turns?

  • Start
  • run
  • they have equal amount of turns
  • depends on the motor phase

8: 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.

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

9: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

10: 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

11: The principle used in continuous type absorption systems is

  • Charles's Law
  • Boyle's Law
  • Ohm's Law
  • Dalton's Law

12: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

13: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Rotary
  • Scroll
  • Centrifugal

14: How many closing forces operate a thermostatic expansion valve?

  • 3
  • 4
  • 1
  • 2

15: What instrument is used to measure very high resistance?

  • meg ohmmeter
  • ammeter
  • tape measure
  • voltmeter

16: What is R-22?

  • Chlorofluoromethane
  • CCFCM
  • Chlorodifluoromethane
  • HFC

17: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

18: The proper location for an oil separator is between the

  • compressor and condenser
  • receiver and metering device
  • condenser and receiver
  • evaporator and compressor

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

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

20: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Discoloration is prevented
  • Copper oxide formation is prevented
  • Exterior scale formation is minimized

21: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 1,000
  • 6.6
  • 110
  • 330

22: How many different groups of refrigerants are there?

  • 15
  • 7
  • 11
  • 3

23: R-12 is

  • dichlorofluoromethane
  • trichlorofluoromethane
  • dichloromethane
  • dichlorodifluoromethane

24: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

25: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b