Topics: ASHRAE/CMR
1: 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.
- 6.6, 6.6
- 2.5, 3.0
- 2.5, 2.5
- 3.0, 3.5
2: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 13.9 lbs
- 6.6 lbs
- 22 lbs
- 44 lbs
3: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
4: Ammonia is under what safety classification?
- A3
- B1
- B3
- B2
5: 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
6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
7: Evaporators within 18" of a heating coil must be equipped with a
- zone valve
- low limit control
- pressure relief device
- high limit control
8: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
9: Most CFC's are
- inert but toxic
- toxic
- flammable
- inert
10: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 250
- 350
- 400
11: 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
12: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
13: Which occupancy can ammonia be used in?
- depends on the quantity of freon
- commercial
- redifential
- industrial
14: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's water
15: 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.
- 90
- 110
- 80
- 100
16: What is the refrigerant dichlorodifluoromethane?
- R-12
- R-22
- R-123
- R-134A
17: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- low pressure
- high pressure
- design pressure
18: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
19: A pressure relief should be located at least _______ from windows and doors.
- 20'
- 30'
- 15'
- 25'
20: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
21: A declaration test is needed when the system contains more than
- 120 lbs
- 55 lbs
- 65 lbs
- 110 lbs
22: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- CFC-11
- HCFC-123
- Lithium bromide
- ammonia
23: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 48
- 36
- 18
24: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 33
- 18
- 22
25: R-123 belongs to Group
- B-1
- B-2
- A-3
- B-3