Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A thermometer inside a duct measures ____ heat.

  • sensible
  • hidden
  • latent
  • specific

2: What pipe can not be used for refrigeration?

  • L
  • N
  • K
  • M

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

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

4: Indirect systems using Group II refrigerants

  • shall be used in refrigeration system less than 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs

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

  • Volume Temperature
  • Adiabatic
  • Pressure Temperature
  • Isothermal

6: Pressure relief valves shall be marked with the data from

  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code
  • Section XIII Division of the ASME Boiler & Pressure Code

7: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

8: A mercury bulb controller is not recommended for

  • use where vibration is severe
  • low voltage use
  • line or low voltage use
  • line voltage use

9: Fusible plugs must have what marked on them?

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

10: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 6.830
  • 34.15
  • 16.64
  • 3.415

11: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the high side
  • upper chamber of the low side
  • lower chamber of the low side
  • upper chamber of the high side

12: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Kelvin
  • 1 Therm
  • 1 BTU
  • The rate of conduction

13: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 100
  • 90
  • 110
  • 80

14: All electrical work done on refrigeration systems must comply with

  • NEC and Massachusetts Modifications
  • ASHREA-15 Section 9.2.1
  • Department of Energy
  • OSHA

15: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • Psychrometer
  • hydrometer
  • refractometer

16: The critical temperature of a refrigerant gas occurs when

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

17: What refrigerant doesn't have to be classifted?

  • R-134a
  • R-718
  • R-717
  • R-711

18: What device should be used on low-temperature freezers?

  • high capacity TXV
  • oil separator
  • hot-gas by-pass
  • discharge muffler

19: Ammonia (NH3) is a group III refrigerant

  • True
  • False

20: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 1000F
  • 700F
  • 600F

21: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 2.5, 2.5
  • 2.5, 3.0
  • 3.0, 3.5
  • 6.6, 6.6

22: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick

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

  • aluminum
  • zinc
  • magnesium
  • all of the above

24: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

25: Liquid level gauges must be provided with what?

  • Automatic shut-offs
  • A relief valve
  • A red line
  • A low level mark