Topics: ASHRAE/CMR
1: A relief valve shall be located at least ___ above grade.
- 10'
- 36'
- 25'
- 15'
2: 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
- 6.6, 6.6
- 2.5, 3.0
3: Most CFC's are
- toxic
- inert but toxic
- inert
- flammable
4: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Stainless steel
- Aluminum
- Copper
5: 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
6: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
7: How far from the ground does a relief valve need to be?
- At least 20' above grade
- At least 25' above grade
- At least 15' above grade
- Not more than 3' above grade
8: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UM or UL
- UL and UM
9: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 15
- III
- 25
10: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- A red line
- Automatic shut-offs
11: Which refrigerant replaced R-12?
- R-22
- R-410A
- R-134A
- R-407A
12: R-22 falls under which safety classification?
- B-2
- A-1
- B-1
- A-2
13: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
14: What refrigerant doesn't have to be classifted?
- R-711
- R-718
- R-134a
- R-717
15: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- phosgene gas sening
- A group sensing
- refrigerant sensing
16: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
17: What is the refrigerant chlorodifluoromethane?
- R-12
- R-134a
- R-22
- R-123
18: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-2
- A-2
- B-1
19: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
20: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- there is no Group B1 refrigerants
- lower
- higher
21: R-717 is
- trichloromethane
- carbon dioxide
- ammonia
- water
22: B3 refrigerants are considered
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but non-flammable
23: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Fire hose connected to the building fire protection system.
- Self-closing doors
24: How many groups of refrigerants are there?
- 7
- 1
- 5
- 3
25: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- critical pressure
- low pressure