Topics: ASHRAE/CMR
1: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
2: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
3: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
4: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- yes
- no
- yes, for systems under 10 tons
5: How many CFMs are required per square foot of commercial office occupied space
- 20 CFM
- 15 CFM
- .5 CFM
- 5 CFM
6: _____ and its alloys are suitable for use with ammonia systems.
- Aluminum
- Magnesium
- Copper
- Zinc
7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
- nothing must be done
8: Ammonia is under what safety classification?
- B3
- B1
- B2
- A3
9: How many gallons of water do you need per pound of ammonia?
- 1
- 100
- 50
- 10
10: 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 RX-11
- Flush with R-11
- Flush with R-718
- Flush with ammonia
11: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in
12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 15
- 50
- 55
13: 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.
- 6.6, 6.6
- 2.5, 2.5
- 2.5, 3.0
- 3.0, 3.5
14: When must refrigeration system covered by the code be inspected?
- Annually
- Annually and when installed
- Upon installation
- Not required
15: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Certified
- Leak checked
- Classifed
16: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- Department of Energy
- OSHA
17: B3 refrigerants are considered
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
- non-toxic but non-flammable
18: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- PVC
- Stainless steel
- Copper
19: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-12
- R-134A
- R-22
20: What refrigerant doesn't have to be classifted?
- R-717
- R-134a
- R-711
- R-718
21: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
22: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
23: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 25
- 10
- 15
24: 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.
- CFC-11
- Lithium bromide
- ammonia
- HCFC-123
25: Stop valves shall not be permitted between the system and the
- relief valve
- service valve
- condenser
- bleed valve