Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Suction valve unloaders afford an effective means of

  • evaporator control
  • refrigerant control
  • capacity control
  • superheat control

2: What type refrigerant is NOT ozone depleting?

  • HFC
  • CFC
  • Halon
  • HCFC

3: A relief valve shall be located at least ___ above grade.

  • 25'
  • 36'
  • 10'
  • 15'

4: "R" represents ___ in the Ohm's law formula

  • voltage
  • resistance
  • amperage
  • capacitance

5: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

6: Pressure is the equivalent of

  • force per unit area
  • force times area
  • area times force
  • force

7: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

8: Which is considered the more efficient condenser?

  • water cooled
  • air cooled
  • spray cooled
  • fan cooled

9: Bubbles in the liquid line sight glass could be caused by

  • overcharge of oil
  • bad low pressure switch
  • leaking discharge valves in the compressor
  • plugged drier

10: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 80%
  • 75%
  • 100%
  • 90%

11: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection and a rupture disc

13: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

14: Ammonia systems use ____ pressure to adjust oil pressure

  • air
  • discharge
  • liquid
  • stream

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

  • booster
  • cascade
  • single stage
  • indirect

16: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

17: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 1,000
  • 330
  • 6.6
  • 110

18: What is used to check very low pressure?

  • Hydrometer
  • Hygrometer
  • Velometer
  • Manometer

19: Transformers are rated in

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

20: 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

21: Before replacing a seized compressor, the _______ should be determinded.

  • type of refrigerant
  • current draw
  • cause of seizure
  • designed head pressure

22: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

23: How many forces operate a thermostatic expansion valve?

  • 3
  • 4
  • 2
  • 1

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

  • voltage.
  • resistance
  • capacitance
  • amperage

25: How many gallons of water do you need per pound of ammonia?

  • 100
  • 50
  • 1
  • 10