Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

3: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Sensible heat
  • Latent heat
  • Enthalpy
  • Specific heat

4: Ammonia systems use ____ pressure to adjust oil pressure

  • discharge
  • air
  • liquid
  • stream

5: Gauge pressure is

  • Absolute pressrue
  • Atmospheric pressure
  • Force of pressure above that of atmosphere
  • Barometric pressure

6: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

7: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • three tons of cooling
  • two tons of cooling
  • one ton of cooling

8: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Electricity
  • Air
  • Heat

9: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

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

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

11: Which is the lowest vacuum?

  • 1,000 Microns
  • 10 psia
  • 5" hg
  • 5 psig

12: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Adiabatic
  • Volume Temperature
  • Pressure Temperature
  • Isothermal

13: Volts x amps equals

  • Watts
  • Inductance
  • Ohms Law
  • Impedance

14: The critical temperature of a refrigerant gas occurs when

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

15: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • never trips
  • must be reset manually
  • resets itself automatically

16: What is not a requirement of a class T machine room?

  • self-closing doors
  • tight fitting doors
  • automatic ventilation
  • fire hose connection to the building fire protection system

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

  • 25%
  • 4%
  • 1%
  • 2%

18: An example of an "Expendable Refrigerant" is

  • liquid nitrogen
  • ammonia
  • lithium bromide
  • liquid oxygen

19: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

20: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 33
  • 18

21: 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.

  • 10
  • 25
  • 20
  • 15

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

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

23: Suction valve unloaders afford an effective means of

  • capacity control
  • refrigerant control
  • evaporator control
  • superheat control

24: Pipe identification labels are required when the system contains more than

  • 65 lbs
  • 110 lbs
  • 55 lbs
  • 120 lbs

25: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 120v
  • 208v
  • 240v
  • 277v