Topics: ASHRAE/CMR
1: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-410A
- R-134A
2: What refrigerant doesn't have to be classifted?
- R-711
- R-717
- R-134a
- R-718
3: Which refrigerant class listed below is the most flammable?
- A-1
- C-3
- A-3
- B-2
4: When a refrigeration or air conditioning system is installed
- it shall not be operated below prescribed pressures
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
5: Ammonia belongs to Group
- A-1
- A-2
- B-1
- B-2
6: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Flammability and temperature range
- Temperature range and hazardousness
- Weight and color
7: 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
8: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- HCFC
- Halon
9: Halo-carbon refrigerants cannot be used with what material?
- Magnesium alloy
- Stainless Steel
- Copper
- Aluminum
10: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- Yes, always
- No, never
11: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
12: 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
13: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
14: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 350
- 50
- 550
15: How many groups of refrigerants are there?
- 3
- 1
- 7
- 5
16: What would be the classification of a prison?
- Institutional
- Industrial
- Place of assembly
- Large mercantile
17: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection as well as a temperature protection device
18: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
19: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
20: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Magnesium
- Zinc
21: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 50
- 25
- 22
22: All electrical work done on refrigeration systems must comply with
- OSHA
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- Department of Energy
23: 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
- licensed technician
- competent welder
- welder qualified
- licensed welder
24: 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
25: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above