Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Screw
  • Centrifugal
  • Scroll

2: "P" represents ______ in the Watt's law formula

  • reactance
  • voltage
  • amperage
  • watts

3: Heat is a form of

  • matter
  • energy
  • work
  • power

4: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • outside the machinery room
  • compressor
  • evaporator

5: On cooling towers, what causes the condenser water to drop

  • tower fans
  • sensible heat
  • evaporation of the water droplets
  • ambient temperatures

6: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

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

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

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

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

9: The rupture disc on a low-pressure chiller typically releases pressure at

  • 5 psig
  • 0 psig
  • 10 psig
  • 15 psig

10: How much clearance do you need around the perimeter of electrical panels?

  • 18"
  • 12"
  • 36"
  • 24"

11: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • non-volumetric displacement compressor
  • negative displacement compressor
  • neutral chamber-type compressor

12: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • hold up to 110% of the pumpdown charge
  • receive the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher

13: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • splurge
  • purge
  • surge
  • merge

14: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 15
  • 18
  • 10
  • 24

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

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

16: A pressure relief should be located at least _______ from windows and doors.

  • 30'
  • 20'
  • 15'
  • 25'

17: 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

18: Refrigerants shall be classified by

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

19: What does an anemometer measure?

  • velocity
  • temperature
  • amperage
  • voltage

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

  • 1.2
  • .8
  • .1
  • 1.7

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

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

22: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • Machinery rooms need not be vented
  • the return air ducted system
  • the mechanical room housing the refrigeration system

23: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • safe access
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • manufactures instructions on start-up procedures

24: A EPR valve is installed on what type of evaporators?

  • high-temperature evaporators
  • low-temperature evaporators
  • shell and tube evaporators
  • plate evaporators

25: R-123 belongs to Group

  • B-1
  • A-3
  • B-2
  • B-3