Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • PVC
  • Copper
  • Magnesium alloy

2: A relief valve discharge capacity is rated in

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

3: Which of the following is NOT a positive displacement compressor?

  • scroll
  • reciprocating
  • centrifugal
  • screw

4: Where must a refrigeration contractor's license number be displayed?

  • Trucks, invoices, and advertising
  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms
  • Uniforms, checks, and invoices.

5: 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

6: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 80%
  • 90%
  • 100%
  • 75%

7: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-1
  • A-2
  • B-2

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

  • Velometer
  • Hydrometer
  • Anemometer
  • Anemotherm

9: Which refrigerant class listed below is the most flammable?

  • B2
  • A3
  • A2
  • C3

10: A secondary coolant is defined as

  • a low temperature refrigerant used for cascading systems
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • any refrigerant direcly in contact with the cooling space for process cooling
  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F

11: Sensible heat is the heat added to a substance to

  • cause evaporation
  • raise its temperature
  • freeze it
  • change its state

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

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

13: The principle used in continuous type absorption systems is

  • Charles's Law
  • Boyle's Law
  • Ohm's Law
  • Dalton's Law

14: When must refrigeration system covered by the code be inspected?

  • Annually
  • Upon installation
  • Not required
  • Annually and when installed

15: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

16: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • trichlorotrifluoromethane
  • methyl chloride
  • ammonia
  • R-718

17: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 400
  • 350
  • 250
  • 100

18: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

19: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • depends on the type of refrigerant being used
  • True
  • False

20: Ammonia belongs to Group

  • A-1
  • A-2
  • B-1
  • B-2

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

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

22: The density of a gas refers to

  • pounds per square foot
  • pounds per cubic foot
  • cubic feet per pound
  • pounds per absolute pressure

23: How is bring measured?

  • hydrometer
  • manometer
  • hygrometer
  • anemometer

24: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

25: In a motor, an internal overload might open if

  • there's a direct short
  • there's an excess current draw through the motor
  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.