Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms

  • 24.0 volts
  • 2,400 volts
  • 240 volts
  • 2.40 volts

2: R-22 is considered a(n)

  • CFC
  • HFC
  • HCFC
  • HCFCH

3: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?

  • RPM and CFM increase
  • CFM and HP increase
  • CFM and RPM decrease
  • CFM and HP decrease

4: Transformers are rated in

  • volt-amps
  • volts
  • volts-ohms
  • amps

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

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

6: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • low head pressure
  • oil in evaporator
  • moisture in the system
  • not enough oil in the system

7: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • There isn't enough information to answer.
  • 1250
  • 2

8: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 55 lbs
  • 500 lbs
  • 330 lbs

9: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • animal, vegetable, and castor

10: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

11: A moisture indicator must

  • change color when exposed to moisture
  • be filled with liquid
  • be sight side up
  • be yellow

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

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

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

  • A-1
  • C-3
  • B-2
  • A-3

14: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 1000 watts
  • 600 watts
  • 5KW

15: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • 1.2
  • .8
  • 1.7
  • .1

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

  • C3
  • B2
  • A2
  • A3

17: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

18: By using nitrogen within a pipe during brazing operation,

  • Copper oxide formation is prevented
  • Exterior scale formation is minimized
  • The explosion hazard is confined
  • Discoloration is prevented

19: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference
  • nearly the same

20: What is not a requirement of a class T machine room?

  • self-closing doors
  • fire hose connection to the building fire protection system
  • tight fitting doors
  • automatic ventilation

21: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • 9,776 watts
  • .9776 watts
  • 9.776 watts

22: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Classifed
  • Insulated and installed in a pipe duct (Encased)
  • Certified

23: A water regulating valve opens when

  • when the power is on there is an overcharge of refrigerant
  • the head pressure rises
  • the compressor is on
  • when the power is on

24: Which occupancy can ammonia be used in?

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

25: How many opening forces operate a thermostatic expansion valve?

  • 2
  • 4
  • 3
  • 1