Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid
  • the gas is no longer saturated

2: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • the vapor side of the system
  • high side of the system
  • the liquid side of the system
  • low side of the system

3: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

4: The first step in mechanical refrigeration is

  • condensation
  • compression
  • evaporation
  • expansion

5: A professional or office building would be considered what type of occupancy?

  • mercantile
  • commercial
  • public assembly
  • business

6: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

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

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

8: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 33
  • 18

9: Atmospheric pressure is equal to

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

10: What section governs pressure vessels?

  • Section ASHREA 34
  • Section 1 ASHREA 15 ASME fired
  • Section 8 ASHREA 15 ASME unfired
  • OSHA

11: What would be the classification for Stop & Shop grocery store?

  • Large mercantile
  • Place of assembly
  • Industrial
  • Instituional

12: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • increased capacity
  • high head pressure
  • low suction pressure
  • low pressure chillers do not have purge units

13: Relief valves are rated in

  • pounds of air per hour
  • pounds of air per minute
  • gallons of water per minute
  • gallons of water per hour

14: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • Solenoid valve
  • EEV
  • EPR valve
  • CPR valve

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

  • Anemomter
  • Barometer
  • Vacuum gauge
  • Manometer

16: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 80 ohms
  • 27 ohms
  • 104 ohms
  • 71 ohms

17: 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

18: What is the boiling point of refrigerant governed by?

  • P&T relationship
  • Condenser sub-cooling
  • Compressor RPM's
  • Evaporator temperature

19: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

20: What is considered a cooling agent?

  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat without vaporization

21: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 100,000
  • 10,000
  • 100
  • 1,000

22: In an A/C unit, dirty filters will cause

  • low oil pressure
  • high discharge pressure
  • high suction pressur
  • low suction pressure

23: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

24: A water regulating valve opens when

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

25: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When its white
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system