Topics: ASHRAE/CMR
1: Class A refrigerants are considered
- non-flammable
- flammable
- toxic
- non-toxic
2: R-123 belongs to Group
- B-3
- B-2
- A-3
- B-1
3: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Fire hose connected to the building fire protection system.
- Self-closing doors
4: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- competent welder
- licensed welder
- licensed technician
5: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- Stainless steel
- PVC
- Copper
6: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's a non-flammable refrigerant
- Because it's water
7: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
8: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UM or UL
- UL and UM
9: Class T machine room
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
10: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
11: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
12: How many refrigerant classifications are there for flammability?
- 1
- 3
- 7
- 2
13: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
14: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
15: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 6.6
- 330
- 110
- 1,000
16: A movie theater would be considered a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- institutional occupancy
17: 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
18: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- annually
- every 18 months
19: 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
20: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class A machinery room
- Class T machinery room
- Class M machinery room
21: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 80%
- 90%
- 100%
22: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- toxic but non-flammable
23: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-134A
- R-718
24: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- condenser
- service valve
25: 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.