Topics: ASHRAE/CMR
1: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
2: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 12"
- 18"
- 36"
3: How many gallons of water do you need per pound of ammonia?
- 1
- 100
- 50
- 10
4: R-11 belongs to Group
- B-1
- B-3
- A-1
- A-2
5: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Flanged and gasketed
- Insulated and cross broke
- Welded and seamed.
6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
7: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 55 lbs
- 330 lbs.
8: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- rupture plug
- fusion plug
- fusible plug
9: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system less than 1,000 lbs
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
10: Can you use Ammonia in industrial applications?
- When mixed with R-718
- No, never
- Yes, always
- Yes, Under certain condidtions
11: Machinery rooms must be vented to ______?
- unoccupied spaces
- neutralizing tank
- basement
- outdoors
12: What is an egress?
- An escape route
- A valve put on the low side of the system to prevent frosting
- A code violation
- An entrance or exit
13: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
14: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 18
- 33
- 22
15: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- 7.25'
- Ceiling height
16: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 80%
- 75%
- 90%
17: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
18: Large mercantile occupancy is
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
19: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 15 CFM
- 20 CFM
- 5 CFM
20: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
21: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
22: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
23: When an inspection is needed, how often must it be done?
- every 18 months
- annually
- every 24 months
- every 36 months
24: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 50
- 20
- 15
- 75
25: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000