Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

3: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • institutional occupancy
  • mixed occupancy
  • public assembly occupancy
  • commercial occupancy

4: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

5: 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

6: How many square inches per square foot?

  • 24
  • 98
  • 144
  • 64

7: Pi equals approximately

  • 3.14
  • 3.41
  • 12,000
  • 746

8: What is the minimum size wire you can use on a 30 amp circuit?

  • 14 AWG
  • 12 AWG
  • 10 AWG
  • 16 AWG

9: Which occupancy can ammonia be used in?

  • depends on the quantity of freon
  • industrial
  • redifential
  • commercial

10: What is not a requirement of a Class T machine room?

  • Tight fitting doors
  • Self-closing doors
  • Fire hose connected to the building fire protection system.
  • Automatic ventilation

11: Which of the following is an example of an azeotropic refrigerant?

  • R-500
  • R-404A
  • R-410A
  • R-134A

12: 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

13: 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

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

14: When an electronic bridge is in balance the bridge output will be

  • 0 volts
  • 1 volt
  • 15 volts
  • .01 volts

15: R-22 is considered a(n)

  • HCFCH
  • HCFC
  • HFC
  • CFC

16: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UL and UM
  • UM or UL
  • UV or UR

17: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be allowed to be used for human comfort.
  • shall not be used for air condition for human comfort
  • shall be installed in Class T machinery rooms

18: Electricity involves the movement of electrons in atoms

  • True
  • False

19: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

20: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 550
  • 50
  • 100
  • 350

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

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

22: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

23: How is bring measured?

  • hydrometer
  • hygrometer
  • anemometer
  • manometer

24: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

25: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above