Topics: ASHRAE/CMR
1: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
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: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
4: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 50
- 33
5: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
6: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
7: How many gallons of water do you need per pound of ammonia?
- 100
- 1
- 10
- 50
8: The color code of a tank of ammonia is
- silver
- white
- light green
- lavender
9: What is the refrigerant dichlorodifluoromethane?
- R-12
- R-22
- R-134A
- R-123
10: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on worst case fractionation
- Based on best case Fractionation
- Based on the oil used
11: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
- PSIG
- PSIA
12: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
13: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
14: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Aluminum
- Copper
- Magnesium alloy
15: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 3 cubic feet or more
- 15 square feet or less
16: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-113
- R-11
- R-12
17: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
18: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Magnesium alloy
- Copper
- Aluminum
19: 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
- ammonia
- HCFC-123
- Lithium bromide
20: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
21: Class 3 refrigerants are
- non-flammable
- toxic
- non-toxic
- highly 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: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
24: A relief valve shall be located at least ___ above grade.
- 25'
- 10'
- 36'
- 15'
25: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above