Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • neutral chamber-type compressor
  • non-volumetric displacement compressor
  • negative displacement compressor

2: It is permissible to use a single-pole switch on a 2 HP motor running at 240 volts as long as the switch is rated for at least 2x FLA.

  • True
  • False

3: "R" represents ___ in the Ohm's law formula

  • capacitance
  • amperage
  • resistance
  • voltage

4: Which refrigerant class listed below is the most flammable?

  • A-3
  • C-3
  • B-2
  • A-1

5: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Self-closing, aligned, fire door
  • Steel, approved, weather-stripped
  • Self-closing, wooden, fire door

6: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.0
  • 3.0
  • 2.5
  • 5.5

7: A class A3 refrigerant is considered

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

8: Liquid line filter-driers on a 410A system must be rated for no less than

  • 400 psig
  • 600 psig
  • 1000 psig
  • 200 psig

9: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

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

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

11: At higher altitudes, boiling temperatures

  • decrease
  • depends on the refrigerant
  • increase
  • are unaffected

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

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

13: Pressure is equivalent of

  • Area X Force
  • Force
  • Force / Area
  • Force X Area

14: Low-side system leaks in a low-pressure chiller will often result in

  • system refrigerant leaking from the system
  • nitrogen leaking out of the system.
  • water being pulled into the system
  • air being pulled into the system

15: What happens after your initial inspection of a pressure vessel?

  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected
  • There is a temporary shut-down until a final inspection can be performed.

16: 14.7 psia is equivalent to

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

17: What are the three components of a transformer?

  • Primary core, secondary coil, and high and low voltage connectors.
  • Contacts, secondary coil, and core
  • Primary coil, secondary coil, and core
  • Primary coil, secondary coil, and copper contacts

18: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

19: 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
  • lift voltage
  • boost voltage
  • pick-up voltage

20: What kind of material can't be used on the outlet of a relief valve?

  • Copper
  • Stainless Steel
  • Aluminum
  • PVC

21: The first step in mechanical refrigeration is

  • compression
  • condensation
  • expansion
  • evaporation

22: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?

  • Moisture and air
  • Oil and water
  • Water and soap
  • Air and dirt

23: Start to Run windings will have what resistance?

  • All will be at equal values
  • The most resistance value
  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value

24: Volts x amps equals

  • Impedance
  • Inductance
  • Ohms Law
  • Watts

25: 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