Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Electricity involves the movement of electrons in atoms

  • True
  • False

2: Secondary refrigerants are usually

  • alcohol
  • Prestone anti-freeze
  • water or brine
  • expensive

3: What are the three components of a transformer?

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

4: 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

5: Single compound Refrigerants are classified by what two criteria?

  • Flammability and toxicity
  • Flammability and temperature range
  • Weight and color
  • Temperature range and hazardousness

6: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusion plug
  • rupture plug
  • relief plug
  • fusible plug

7: The certificate of inspection

  • shall be authorized by a notarized insurance company
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be posted and protected from dirt, water, and other elements

8: R-12 is

  • dichlorodifluoromethane
  • dichloromethane
  • trichlorofluoromethane
  • dichlorofluoromethane

9: Two systems using separate refrigerants that are superimposed upon one another is called

  • cascade
  • single stage
  • booster
  • indirect

10: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

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

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

12: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • release the charge when the pressure exceeds 310 psig or higher
  • hold up to 110% of the pumpdown charge
  • receive the pumpdown charge

13: Most CFC's are

  • inert but toxic
  • toxic
  • flammable
  • inert

14: Pi equals approximately

  • 3.41
  • 3.14
  • 12,000
  • 746

15: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • load-side of the contactor in
  • breaker panel in
  • first disconnect in

16: Dew point is

  • the temperature below which water vapor in the air will start to evaporate
  • the temperature above which water vapor in the air will start to condense
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to condense

17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

18: Humidity can be sensed with

  • human hair
  • bimetal
  • pressure bellows
  • thermometer

19: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

20: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Authorized persons only
  • Any employee
  • Anyone, it's a completely safe area

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

  • Enthalpy
  • Latent heat
  • Sensible heat
  • Specific heat

22: Cooling tower lowers condenser water temp by

  • condensation
  • evaporative cooling
  • running water thru a secondary heat exchanger
  • running fans at 100%

23: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 4
  • 2
  • 3
  • 5

24: The most common type of motor starter is

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

25: On cooling towers, what causes the condenser water to drop

  • sensible heat
  • evaporation of the water droplets
  • tower fans
  • ambient temperatures