Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line

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

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

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

  • 970
  • 180
  • 144
  • 212

4: R-12 is

  • dichlorodifluoromethane
  • dichloromethane
  • dichlorofluoromethane
  • trichlorofluoromethane

5: A class B1 refrigerant is considered

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

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

  • 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.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved

7: A split-phase motor has a ______ winding and a ____ winding

  • duel-run, duel-start
  • run, common
  • start, common
  • run, start

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

  • Enthalpy
  • Sensible heat
  • Latent heat
  • Specific heat

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

  • 66
  • 45
  • 60
  • 38

10: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

11: Clearance volume

  • varies depending on compressor speed
  • affects compressor capacity
  • is the same on all compressors
  • has no effect on compressor capacity

12: 746 watts is equal to

  • 1 hp
  • 10 hp
  • Pi
  • 100 hp

13: Most CFC's are

  • inert
  • flammable
  • inert but toxic
  • toxic

14: A class A3 refrigerant is considered

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

15: The best way to detect ammonia in brine is

  • CO2 gas
  • potassium of line
  • nessler regaent
  • carbonation of soda

16: What type refrigerant is NOT ozone depleting?

  • HCFC
  • CFC
  • HFC
  • Halon

17: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • reset the expansion valve
  • reset the safety valve
  • start the fan and circulating pump

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

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

19: What is used to check very low air pressures in air conditioning duct?

  • Manometer
  • Vacuum gauge
  • Anemomter
  • Barometer

20: What do you need to do when you install a new system?

  • Insulate the suction line before you take a superheat reading
  • Have it inspected
  • Add refrigerant
  • Document the superheat and subcooling reading

21: Name a reason that does not cause reduced condenser air quantity

  • Dirty fan blades
  • High ambient temperature
  • Prevailing winds
  • Dirty Coil

22: Which of the following is not an air velocity meter?

  • Velometer
  • Anemotherm
  • Anemometer
  • Hydrometer

23: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

24: The low pressure oil safety switch

  • never trips
  • must be reset manually
  • resets itself after the time delay has terminated
  • resets itself automatically

25: "I" represents ____ in the Ohm's law formula.

  • voltage.
  • amperage
  • capacitance
  • resistance