Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 15 amps
  • 10 amps
  • 5 amps
  • 20 amps

2: The absorber shell contains the

  • condenser and the generator
  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • evaporator and the absorber

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

  • Inspector leaves a metal tag with a certification listed on it
  • There is a temporary shut-down until a final inspection can be performed.
  • Notify the AHJ to let them know that the system been inspected
  • Notify the Fire Marshal that the system has been inspected and approved

4: The location of a thermal bulb of a TXV affects

  • the amount of liquid returning to the compressor
  • the amount of liquid in the condenser.
  • subcooling
  • the amount of liquid refrigerant in the evaporator

5: A relief valve discharge capacity is rated in

  • PSIA
  • Pounds of air per minute.
  • temperature minus pounds of air per second divided by release rate squared
  • PSIG

6: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

7: Where is the high-side float located on a chiller system?

  • inside the chiller barrel
  • liquid line
  • flash line
  • discharge line

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

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

9: What type of relief valve is used on a CO2 system?

  • glove disc
  • gate valve
  • rupture disc
  • fusible plug

10: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

11: Refrigerants shall be classified by

  • toxicity and flammability
  • maximum permissible quantities of each group
  • color codes
  • requirements for commercial, industrial, and residential occupancies

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

  • Velometer
  • Anemometer
  • Anemotherm
  • Hydrometer

13: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

14: What is not a requirement of a Class T machine room?

  • Self-closing doors
  • Fire hose connected to the building fire protection system.
  • Tight fitting doors
  • Automatic ventilation

15: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 88
  • 108
  • 38

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

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

17: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • adjustment of the spring tension of the TXV
  • cooling temperature set-point
  • opening at the pump outlet
  • opening at the pump inlet

18: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Insulated
  • Inspected
  • Pressurized

19: In a system designed for sub-zero ambient temperatures, what must be added?

  • Infrared dye for leak identification
  • Low-ambient kit
  • Booster compressor
  • Nitrogen

20: Humidity can be sensed with

  • bimetal
  • human hair
  • pressure bellows
  • thermometer

21: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

22: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • higher
  • the same
  • lower
  • there is no Group B1 refrigerants

23: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

24: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

25: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • orange
  • green
  • red
  • blue