Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Gauge pressure is

  • Atmospheric pressure
  • Absolute pressrue
  • Force of pressure above that of atmosphere
  • Barometric pressure

2: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 240v
  • 120v
  • 208v
  • 277v

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

  • 45
  • 38
  • 66
  • 60

4: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

5: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • At least 30'
  • There is no minimum for relief valve and windows.
  • At least 40'

6: Liquid level gauges must be provided with what?

  • A red line
  • A low level mark
  • A relief valve
  • Automatic shut-offs

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: The proper location for an oil separator is between the

  • evaporator and compressor
  • condenser and receiver
  • compressor and condenser
  • receiver and metering device

9: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .8
  • .1
  • 1.7
  • 1.2

10: Suction valve unloaders afford an effective means of

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

11: Which of the following is an example of an azeotropic refrigerant?

  • R-404A
  • R-134A
  • R-410A
  • R-500

12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 330 lbs.
  • 660 lbs
  • 55 lbs
  • 550 lbs

13: How many refrigerant classifications are there for toxicity?

  • 5
  • 1
  • 2
  • 3

14: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

15: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

16: 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 detect refrigeration leaks in piping joints
  • to release a sticking valve

17: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of high temperature evaporator
  • outlet of the liquid line

18: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall not be used for air condition for human comfort
  • shall be allowed to be used for human comfort.

19: An electronic bridge circuit is basically a

  • high voltage circuit
  • suspension
  • 24 volt control circuit
  • Wheatstone

20: What is the refrigerant chlorodifluoromethane?

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

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

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

22: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with ammonia
  • Flush with R-11
  • Flush with RX-11
  • Flush with R-718

23: Indirect systems using Group II refrigerants

  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall be used for mechanical equipment only
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system less than 1,000 lbs

24: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

25: What refrigerant doesn't have to be classified?

  • R-717
  • R-718
  • R-422A
  • R-134A