Topics: ASHRAE/CMR
1: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
2: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- 2.5 times the design pressure
- the aggregate of the high side and low side
3: Indirect systems using Group II refrigerants
- shall be used in refrigeration system less than 1,000 lbs
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used for mechanical equipment only
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
4: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
5: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- bi-annually
- regularly
- annually
- quarterly
6: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
7: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
8: 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
9: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
10: A class A3 refrigerant is considered
- toxic and non-flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
11: How many refrigerant classifications are there for flammability?
- 1
- 7
- 3
- 2
12: 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 20'
- At least 30'
- At least 40'
13: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
14: What refrigerant doesn't have to be classifted?
- R-134a
- R-718
- R-711
- R-717
15: The color code of a tank of ammonia is
- light green
- white
- silver
- lavender
16: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
17: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
18: 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
19: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
20: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-1
- B-2
- A-2
21: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 65 lbs
- 110 lbs
22: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the liquid side of the system
- the vapor side of the system
- high side of the system
23: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 600F
- 700F
- 800F
24: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
25: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above