Topics: ASHRAE/CMR
1: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 75%
- 90%
2: A class B2 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
3: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the low side
- the high side
4: A High-Probablity system
- 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
- 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
5: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Certified
- Leak checked
- Classifed
- Insulated and installed in a pipe duct (Encased)
6: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
7: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
8: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
9: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 15
- 10
- 18
- 24
10: 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
11: Who approves containers for refrigerants?
- D.O.T
- D.O.E
- E.P.A
- D.O.D
12: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- the same
- lower
- there is no Group B1 refrigerants
13: What is not a requirement of a Class T machine room?
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
14: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 15'
- 30'
- 20'
15: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Contractor who last serviced the system.
- Board of Boilers
- Person in charge of the facility
16: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- the vapor side of the system
- low side of the system
- the liquid side of the system
17: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- CFC
- Halon
18: A movie theater would be considered a
- commercial occupancy
- institutional occupancy
- mixed occupancy
- public assembly occupancy
19: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-22
- R-134A
- R-11
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can't change refrigerants
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- place sign, check for leaks, insulate
21: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
22: A restaurant is classified as a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
23: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 40'
- At least 30'
- At least 20'
24: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
25: Ammonia can come in contact with _______ ?
- Copper tubing
- Copper
- Aluminum
- Brass