Topics: ASHRAE/CMR
1: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
2: The color code of a tank of ammonia is
- white
- silver
- light green
- lavender
3: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
4: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
5: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Have it inspected
- Add refrigerant
- Insulate the suction line before you take a superheat reading
6: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100
- 10,000
- 1,000
- 100,000
7: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-22
- R-11
8: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 10
- 15
- III
9: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
10: Can ammonia be used on domestic system?
- yes
- no
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
11: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 3.0
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
12: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
13: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
14: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
15: 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
16: Which occupancy can ammonia be used in?
- industrial
- commercial
- redifential
- depends on the quantity of freon
17: What type of copper is not permitted on refrigeration systems?
- Type K
- Type M
- Type N
- Type L
18: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
19: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 100
- 330
- 200
20: Class A refrigerants are considered
- toxic
- non-flammable
- non-toxic
- flammable
21: What is Trichlorotrifluoromethane?
- R-11
- R-13
- R-12
- R-113
22: Ammonia belongs to Group
- A-2
- B-2
- B-1
- A-1
23: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-113
- R-11
- R-12
24: A relief valve shall be located at least ___ above grade.
- 25'
- 10'
- 36'
- 15'
25: What pipe can not be used for refrigeration?
- M
- N
- K
- L