Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of fusion
  • removing the latent heat of vaporization
  • passing thru the tubes from top to bottom
  • water sprayed over condenser

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

  • 330 lbs
  • 55 lbs
  • 660 lbs
  • 500 lbs

3: How many gallons of water do you need per pound of ammonia?

  • 1
  • 50
  • 10
  • 100

4: 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

5: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

6: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested

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

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

8: _____ and its alloys are suitable for use with ammonia systems.

  • Magnesium
  • Copper
  • Aluminum
  • Zinc

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

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

10: No open flames are allowed in the machinery room unless?

  • Approved by the installing contractor
  • Never can be allowed
  • Approved by the authorized person
  • Only when combustion air is provided from outside of the machinery room

11: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

12: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • institutional occupancy
  • illegal occupancy
  • commercial occupancy
  • public assembly occupancy

13: Heat transferred by conduction from one body to another is done

  • via solids
  • via liquids
  • via radiation
  • via heat rays

14: Ammonia vaporization takes place at what temperature?

  • -28F
  • -110F
  • -460F
  • -32F

15: When energized, a normally open relay will be

  • open
  • noisy
  • closed
  • depends on the type and class of the relay

16: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 50.2 psig
  • 66.1 psig
  • 70.8 psig
  • 43.3 psig

17: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • welder qualified
  • competent welder
  • licensed technician
  • licensed welder

18: Mercury was used in thermometers primarily because it

  • never freezes
  • vaporizes at very high temperatures
  • was inexpensive
  • expands uniformly

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

  • A-1
  • A-2
  • B-2
  • B-1

20: What is a Category "D" fluid?

  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F

21: Secondary refrigerants are usually

  • water or brine
  • alcohol
  • Prestone anti-freeze
  • expensive

22: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Latent heat
  • Specific heat
  • Enthalpy
  • Sensible heat

23: What device should be used on low-temperature freezers?

  • high capacity TXV
  • discharge muffler
  • hot-gas by-pass
  • oil separator

24: Control systems can be classified by

  • safety
  • source of power
  • economy of operation
  • tonnage of system

25: The Board of Boilers adopts by reference

  • the MACS Pressure Vessel Code of Massachusetts
  • the 1997 ANSI/ASHRAE Safety Code
  • Montreal Protocol Safety Code
  • MSCA Code