ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: 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

2: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • 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 volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

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

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

4: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 90%
  • 100%

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

  • Aluminum
  • Magnesium
  • Zinc
  • Copper

6: How many refrigerant classifications are there for flammability?

  • 1
  • 2
  • 3
  • 7

7: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Pressurized
  • Inspected
  • Insulated

8: A restaurant is classified as a

  • public assembly occupancy
  • mixed occupancy
  • commercial occupancy
  • large mercantile occupancy

9: All electrical work done on refrigeration systems must comply with

  • OSHA
  • ASHREA-15 Section 9.2.1
  • NEC and Massachusetts Modifications
  • Department of Energy

10: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

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

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

12: Each machinery room shall contain

  • high and low pressure controls
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate

13: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 2.5, 3.0
  • 3.0, 3.5
  • 6.6, 6.6
  • 2.5, 2.5

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

  • PVC
  • Magnesium alloy
  • Stainless steel
  • Copper

15: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 30'
  • 20'
  • 15'

16: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection and a rupture disc
  • over pressure protection as well as a temperature protection device
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection

17: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

18: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When it's used as part of a supply or return air system
  • When there are sprinklers above
  • When there is a space 6' or more above it

19: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 2.2
  • 1.2
  • 1.5
  • 1

20: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 110
  • 100
  • 90
  • 80

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

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

22: A class B2 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic and highly flammable
  • toxic and non-flammable
  • toxic and somewhat flammable

23: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • there is no Group B1 refrigerants
  • higher
  • the same
  • lower

24: A class A3 refrigerant is considered

  • toxic and non-flammable
  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable

25: R-22 falls under which safety classification?

  • A-1
  • B-1
  • A-2
  • B-2