Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

2: The oil separator is always inserted in the system

  • in a cool spot
  • in the discharge line
  • to prevent oil logging
  • where it can be easily serviced

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

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

4: Ammonia is under what safety classification?

  • B2
  • A3
  • B1
  • B3

5: R-22 is considered a(n)

  • HCFC
  • HFC
  • HCFCH
  • CFC

6: Copper and its alloys shall not be used with ammonia

  • True
  • False

7: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • bi-annually
  • quarterly
  • regularly

8: 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

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: Halogen refrigerants are corrosive to which type of metal?

  • stainless steel
  • copper
  • black iron
  • magnesium

11: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 80 ohms
  • 27 ohms
  • 104 ohms
  • 71 ohms

12: What are the three components of a transformer?

  • Primary coil, secondary coil, and copper contacts
  • Primary coil, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.
  • Contacts, secondary coil, and core

13: Sublimation occurs when

  • gas is formed directly from a solid
  • ice melts and turns to water
  • gas is formed from a liquid
  • liquid is formed from a gas

14: The purpose of an accumulator is to

  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant
  • assure no liquid returns to the compressor
  • filter out impurities from the system

15: The two float-type metering devices are the

  • liquid float and the low-side float
  • liquid float and the vapor float
  • vapor float and the low-side float.
  • high-side float and the low-side float

16: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • refrigerant sensing
  • A group sensing
  • phosgene gas sening
  • CO Sensing

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

  • red
  • blue
  • orange
  • green

18: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • load-side of the contactor in
  • first disconnect in
  • breaker panel in

19: The Department that certifies the transportation of refrigerant is the

  • EPA
  • EPO
  • DOT
  • RSES

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

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

21: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Kelvin
  • 1 Therm
  • 1 BTU
  • The rate of conduction

22: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • moisture barrier
  • insulated
  • leak checked

23: Who approves containers for refrigerants?

  • D.O.E
  • D.O.D
  • E.P.A
  • D.O.T

24: The principle used in continuous type absorption systems is

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

25: What must be done to refrigerant pipes before being buried?

  • Encased
  • Coated
  • Leaked checked
  • Certified