Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 44 lbs
  • 6.6 lbs
  • 13.9 lbs

2: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Centrifugal
  • Scroll
  • Screw

3: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

4: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

5: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

6: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

7: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

8: The absorber shell contains the

  • condenser and the absorber
  • evaporator and the absorber
  • condenser and the generator
  • condenser, the evaporator, and the generator

9: Ohm's Law indicates Amps X Resistance = ___________.

  • Volts
  • Current
  • Ohms
  • Impedance

10: The actual expansion curve of compressor follows most nearly which one of the following

  • Volume
  • Isothermal
  • Pressure-Temperature
  • Adiabatic

11: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the high side
  • the low side
  • the aggregate of the high side and low side
  • 2.5 times the design pressure

12: An accumulator can be located between the

  • first stage and second stage compressors
  • compressor and condenser
  • evaporator and compressor
  • condenser and evaporator

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

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

14: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

15: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

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

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

17: Fusible plugs must have what marked on them?

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

18: 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

19: Ammonia vaporization takes place at what temperature?

  • -32F
  • -110F
  • -460F
  • -28F

20: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • run voltage
  • pick-up voltage
  • boost voltage
  • lift voltage

21: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Nickel
  • Magnesium
  • Copper
  • Zinc

22: Pressure vessels with an internal volume of 3 cubic feet or less

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

23: Gauge pressure is

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

24: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • post-rotational guide vanes
  • check valves
  • pre-rotational guide vanes

25: 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