Topics: ASHRAE/CMR
1: 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
2: 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.
- ammonia
- HCFC-123
- CFC-11
- Lithium bromide
3: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
4: Ammonia can come in contact with _______ ?
- Brass
- Copper tubing
- Aluminum
- Copper
5: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
- Based on best case Fractionation
6: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
7: 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
8: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 80%
- 75%
- 90%
9: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 10
- III
- 25
10: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a pressure relief device
11: Indirect systems using Group II refrigerants
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
12: 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 high side
- 2.5 times the design pressure
- the low side
- the aggregate of the high side and low side
13: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
14: What is a Category "M" fluid?
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
15: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Leak tested
- Pressurized
- Insulated
16: What pipe can not be used for refrigeration?
- M
- K
- N
- L
17: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UV or UR
- UL and UR
- UM or UL
18: Can you use Ammonia in industrial applications?
- Yes, always
- No, never
- Yes, Under certain condidtions
- When mixed with R-718
19: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1
- 1.2
- 1.5
20: 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
21: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
22: How many flammability classifications are refrigerants in?
- 3
- 2
- 5
- 7
23: Most CFC's are
- toxic
- flammable
- inert but toxic
- inert
24: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
25: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- illegal occupancy
- institutional occupancy
- public assembly occupancy
- commercial occupancy