ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber

2: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

3: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 5
  • 1
  • 2
  • 3

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

  • 24"
  • 36"
  • 18"
  • 12"

5: R-717 is

  • ammonia
  • trichloromethane
  • water
  • carbon dioxide

6: Ammonia can come in contact with _______ ?

  • Brass
  • Aluminum
  • Copper tubing
  • Copper

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

  • Coated
  • Certified
  • Encased
  • Leaked checked

8: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type N
  • Type L
  • Type K

9: Refrigerant restricted in 2004 but used for transition for decades:

  • R-134A
  • R-22
  • R-123
  • R-11

10: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs

11: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.5
  • 3.0
  • 2.0
  • 5.5

12: High pressure controls should be set no higher than

  • 10% of set point
  • 80% of set point
  • 25% of set point
  • 90% of set point

13: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • gas masks must be worn
  • no flames shall be permitted
  • the owner shall be informed
  • explosion precautions must be taken

14: What is the minimum height refrigeration piping should be placed against walls?

  • Ceiling height
  • 6'
  • 72"
  • 7.25'

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

  • 100%
  • 80%
  • 75%
  • 90%

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

17: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

18: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Person who pulled the permit
  • Board of Boilers
  • Contractor who last serviced the system.

19: How many different groups of refrigerants are there?

  • 7
  • 3
  • 15
  • 11

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

  • 5
  • 20
  • 15
  • 1

21: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

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

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

23: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

24: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or more
  • 15 cubic feet or more
  • 3 cubic feet or less
  • 15 square feet or less

25: A Low-Probability System

  • 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
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection will enter the occupied space