Topics: ASHRAE/CMR
1: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
2: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- annually
- quarterly
- bi-annually
3: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 7.25'
- 7.00'
- 9.00'
4: R-717 is
- ammonia
- carbon dioxide
- trichloromethane
- water
5: Refrigerants shall be classified by
- maximum permissible quantities of each group
- color codes
- requirements for commercial, industrial, and residential occupancies
- toxicity and flammability
6: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 700F
- 800F
- 600F
7: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
8: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
9: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 660 lbs
- 55 lbs
- 330 lbs
11: Indirect systems using Group II refrigerants
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used for mechanical equipment only
12: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
13: What refrigerant is an inorganic compound?
- R-22
- Ammonia
- R-132A
- R-410A
14: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- III
- 10
- 15
15: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
16: 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.
- HCFC-123
- CFC-11
- Lithium bromide
- ammonia
17: Which refrigerant class listed below is the most flammable?
- A2
- C3
- A3
- B2
18: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- insulated
- moisture barrier
- leak checked
19: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with R-718
- Flush with RX-11
- Flush with ammonia
20: What refrigerant doesn't have to be classifted?
- R-134a
- R-718
- R-717
- R-711
21: 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
- licensed technician
- licensed welder
- competent welder
22: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
23: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 44 lbs
- 6.6 lbs
- 13.9 lbs
24: A relief valve shall be located at least ___ above grade.
- 10'
- 25'
- 36'
- 15'
25: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-12
- R-113
- R-11