Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
2: Halogenated refrigerants cannot be used with what material?
- Copper
- Aluminum
- Stainless steel
- Magnesium alloy
3: What is not a requirement of a class T machine room?
- automatic ventilation
- self-closing doors
- fire hose connection to the building fire protection system
- tight fitting doors
4: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
5: A class A3 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
6: 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)
- institutional occupancy
- illegal occupancy
- public assembly occupancy
- commercial occupancy
7: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
8: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic but non-flammable
- toxic and highly flammable
9: How many flammability classifications are refrigerants in?
- 2
- 7
- 5
- 3
10: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
11: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 13.9 lbs
- 22 lbs
- 44 lbs
12: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 80%
- 100%
- 75%
13: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
14: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
15: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
16: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 75%
- 90%
- 80%
17: Which refrigerant replaced R-12?
- R-407A
- R-134A
- R-410A
- R-22
18: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 15
- III
- 10
19: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
20: What is a Category "M" fluid?
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- 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
21: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Rupture disk
- Gate valve
- Glove valve
22: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
23: R-11 belongs to Group
- B-3
- A-1
- A-2
- B-1
24: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- higher
- the same
- there is no Group B1 refrigerants
25: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room