Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A direct system

  • is on where brine is cooled & circulated to the space refrigerated
  • is a self-contained complete factory made and tested system
  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated

2: The best way to detect ammonia in brine is

  • nessler regaent
  • potassium of line
  • carbonation of soda
  • CO2 gas

3: Low-side system leaks in a low-pressure chiller will often result in

  • water being pulled into the system
  • system refrigerant leaking from the system
  • nitrogen leaking out of the system.
  • air being pulled into the system

4: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • run as designed with low ambient controls
  • doesn't change
  • increases

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

6: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

7: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • TXV
  • High side float
  • Low side float

8: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick

9: E = I X R is

  • Impedance Law
  • Ohms Law
  • Amps Law
  • Watts Law

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

  • A-1
  • A-3
  • B-2
  • C-3

11: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed

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

  • aluminum
  • zinc
  • magnesium
  • all of the above

13: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

14: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

15: In an electrical circuit, what is potential measured in?

  • Volts
  • Herys
  • Ohms
  • Amps

16: When air is ducted through a machine room that services occupied space, What must be done?

  • Insulated and cross broke
  • Welded and seamed.
  • Flanged and gasketed
  • Ducted and sealed

17: If the spring is adjusted to increase the superheat, this new setting will

  • lengthen the frost line
  • have no effect on the frost line
  • shorten the frost line
  • allow more liquid into the evaporator

18: A low oil switch is typically

  • non used on semi-hermetic compressors over 10 ton capacity
  • manual reset
  • time-delay auto reset
  • automatic reset

19: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

20: What is the amp draw of a 40 VA transformer at 24 volts

  • 1.6 amps
  • 1K amps
  • 106 amps
  • 1,000 amps

21: 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

22: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

23: 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

24: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • commercial occupancy
  • public assembly occupancy.
  • mercantile occupancy
  • business occupancy

25: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space