Topics: ASHRAE/CMR
1: 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
2: How many flammability classifications are refrigerants in?
- 2
- 7
- 5
- 3
3: The Board of Boilers adopts by reference
- MSCA Code
- the 1997 ANSI/ASHRAE Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- Montreal Protocol Safety Code
4: 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.
- Lithium bromide
- CFC-11
- HCFC-123
- ammonia
5: A class A3 refrigerant is considered
- non-toxic but highly flammable
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
6: 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.
- 3.0, 3.5
- 2.5, 2.5
- 2.5, 3.0
- 6.6, 6.6
7: How many groups of refrigerants are there?
- 3
- 7
- 1
- 5
8: Which occupancy can ammonia be used in?
- commercial
- industrial
- redifential
- depends on the quantity of freon
9: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
10: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Flammability and temperature range
- Temperature range and hazardousness
- Flammability and toxicity
11: 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
12: Which refrigerant replaced R-12?
- R-134A
- R-410A
- R-22
- R-407A
13: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Copper
- Aluminum
- Magnesium alloy
14: 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
15: 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.
- 50
- 55
- 75
- 15
16: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
17: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Encased
- Certified
18: Each machinery room shall contain
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
19: A professional or office building would be considered what type of occupancy?
- public assembly
- mercantile
- commercial
- business
20: 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
21: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- low limit control
- high limit control
- zone valve
22: Pipe identification labels are required when the system contains more than
- 55 lbs
- 120 lbs
- 65 lbs
- 110 lbs
23: A hotel is considered a _______ occupancy.
- mercantile
- institutional
- commercial
- residential
24: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Aluminum
- Copper
- Magnesium alloy
25: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug