Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

2: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

3: When must refrigeration system covered by the code be inspected?

  • Annually and when installed
  • Not required
  • Annually
  • Upon installation

4: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Nesting scrolls
  • Suction and discharge valves
  • Rotating vanes
  • Fan-like action

5: Thermodynamics is the branch of science that deals with

  • heat energy
  • energy due to motion
  • molecular therory
  • state of energy

6: A tachometer is an instrument used to measure

  • RPM
  • static pressure
  • air velocity
  • speed

7: An accumulator can be located between the

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

8: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

9: Where must a refrigeration contractor's license number be displayed?

  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.

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

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

11: What pipe can not be used for refrigeration?

  • M
  • K
  • N
  • L

12: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 45
  • 38
  • 66

13: It takes how many BTU/hr to melt one pound of ice at 32F

  • 144
  • 212
  • 180
  • 970

14: 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 plus equivalent-length of fittings
  • the total length of pipe as you would measure it

15: Floc point is

  • the lowest temperature at which dissolved waxes and solids begin to separate in a system
  • the highest temperature at which dissolved waxes and solids begin to separate in a system
  • the lowest temperature at which dissolved waxes and solids begin to solidify in a system
  • the highest temperature at which dissolved waxes and solids begin to solidify in a system

16: Define occupied space?

  • Residential Occupancy
  • The portion of the premises accessible to or occupied by people excluding machinery rooms
  • The portion of the premises accessible to or occupied by people including machinery rooms
  • Both a & b

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

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

18: A run capacitor is wired in series with the _____ windings.

  • common
  • start
  • run
  • start capacitor

19: What is the intention of the word “shall” as used in the code?

  • A mandatory requirement
  • A recommendation or advisory guideline
  • A technician’s choice of how it should be done
  • None of the above

20: Booster compressors connect to the ____ side of the compressor

  • oil side
  • liquid
  • low side
  • vapor

21: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

22: An example of direct system is

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

23: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 70F
  • 77F
  • 58F
  • 32F

24: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • High head pressure and low suction pressure
  • Low head pressure and high suction pressure
  • Low suction pressure and low discharge pressure
  • High suction pressure and high discharge pressure.

25: 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

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