Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use fusible plugs

2: A halide torch is most useful with a freon compression system

  • to remove from from TXV's and evaporator coils
  • to sweat flanges on the refrigeration piping
  • to release a sticking valve
  • to detect refrigeration leaks in piping joints

3: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more

4: 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

5: 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

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

6: When an electronic bridge is in balance the bridge output will be

  • 15 volts
  • 1 volt
  • .01 volts
  • 0 volts

7: Brazed joints melt at temperatures above

  • 800F
  • 1,200F
  • 500F
  • 1,000F

8: While the system is operating, the discharge line should be

  • room temperature
  • 10-15F warmer than ambient
  • too hot to hold by hand
  • at the same temperature as the crankcase

9: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

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

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

11: Oils, classified as to source, are

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

12: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Contractor who last serviced the system.
  • Person who pulled the permit
  • Board of Boilers

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

  • mercantile
  • public assembly
  • commercial
  • business

14: What is the refrigerant chlorodifluoromethane?

  • R-123
  • R-12
  • R-134a
  • R-22

15: A tachometer is an instrument used to measure

  • static pressure
  • air velocity
  • RPM
  • speed

16: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

17: RPM's of a centrifugal compressor are at approximately?

  • 500
  • 30,000
  • 10,000
  • 15,000

18: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • rupture plug
  • relief plug
  • fusible plug
  • fusion plug

19: When energized, a normally open relay will be

  • depends on the type and class of the relay
  • open
  • closed
  • noisy

20: 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

21: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • competent welder
  • licensed technician
  • welder qualified
  • licensed welder

22: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 1/2"
  • 5/8"
  • 3/8"
  • 3/4"

23: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and unbalanced head and friction head
  • GPM and friction head
  • GPM, pipe size, and equivalent head.

24: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

25: What would be the classification of a church?

  • Institutional
  • Industrial
  • Large mercantile
  • Place of assembly