Topics: ASHRAE/CMR
1: Ammonia (NH3) is a group III refrigerant
- True
- False
2: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
3: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- Locked doors
- OSHA approved
- Well-lit exit signs
4: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 50
- 350
- 550
5: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
6: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
7: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
8: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 30'
- 20'
- 15'
9: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Add refrigerant
- Have it inspected
- Insulate the suction line before you take a superheat reading
10: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 90%
- 75%
- 99%
11: 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
12: R-22 falls under which safety classification?
- A-2
- B-1
- B-2
- A-1
13: What is an egress?
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- An escape route
- A code violation
14: 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
15: Ammonia can come in contact with _______ ?
- Brass
- Copper tubing
- Aluminum
- Copper
16: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
17: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the low side
- the high side
18: What section governs pressure vessels?
- OSHA
- Section 8 ASHREA 15 ASME unfired
- Section ASHREA 34
- Section 1 ASHREA 15 ASME fired
19: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- no
- yes, for systems under 10 tons
- yes
20: What is the minimum height refrigeration piping should be placed against walls?
- Ceiling height
- 6'
- 72"
- 7.25'
21: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
22: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
23: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
24: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 3
- 5
- 2
25: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
- pounds of air per minute