Topics: ASHRAE/CMR
1: A relief valve shall be located at least ___ above grade.
- 25'
- 10'
- 15'
- 36'
2: 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
3: 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 rupture discs or duel pressure relief valves
- shall use fusible plugs
4: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
5: 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
6: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
7: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
8: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-12
- R-11
9: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
- PSIA
- PSIG
10: What is an egress?
- An escape route
- A code violation
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
11: Relief valves are rated in
- gallons of water per minute
- gallons of water per hour
- pounds of air per hour
- pounds of air per minute
12: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- commercial occupancy
- institutional occupancy
- public assembly occupancy
13: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- installed through a pipe casing
- moisture barrier
- leak checked
14: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Nothing must be done
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
15: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 75%
- 80%
- 90%
16: When an inspection is needed, how often must it be done?
- every 18 months
- every 24 months
- annually
- every 36 months
17: A Low-Probability System
- is a system highly likely to leak form 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 a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
18: 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
19: What is the minimum height refrigeration piping should be placed against walls?
- 7.25'
- 72"
- 6'
- Ceiling height
20: 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 water
- Because it's cheap
21: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
22: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 25
- 22
- 66
- 50
23: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 80%
- 90%
- 100%
24: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
25: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-12
- R-502
- R-113