Topics: ASHRAE/CMR
1: Class A refrigerants are considered
- toxic
- flammable
- non-toxic
- non-flammable
2: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- toxic and non-flammable
3: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
4: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
5: Ammonia (NH3) is a group III refrigerant
- True
- False
6: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
7: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- rupture plug
- fusion plug
- relief plug
8: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
9: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
10: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 20
- 10
- 15
11: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and reciever
- on top of the condensor
- between the compressor and the stop valve
12: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's a non-flammable refrigerant
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
13: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
14: Which occupancy can ammonia be used in?
- commercial
- depends on the quantity of freon
- redifential
- industrial
15: Which refrigerant replaced R-12?
- R-407A
- R-134A
- R-22
- R-410A
16: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
17: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- insulated
- installed through a pipe casing
- moisture barrier
18: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- 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 from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the occupied space
19: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
20: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 75%
- 80%
- 90%
21: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- At least 20'
- At least 40'
- There is no minimum for relief valve and windows.
22: What type of copper is not permitted on refrigeration systems?
- Type M
- Type K
- Type L
- Type N
23: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
24: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 100
- 110
- 80
25: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Zinc
- Magnesium
- Aluminum