Topics: ASHRAE/CMR
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