Topics: ASHRAE/CMR
1: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- 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
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
2: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
3: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use fusible plugs
4: Class A refrigerants are considered
- flammable
- toxic
- non-toxic
- non-flammable
5: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 18
- 36
- 48
6: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Pressurized
- Leak tested
- Insulated
7: NH3 is
- ammonia
- lithium bromide
- R-508A
- R-718
8: What type of copper is not permitted on refrigeration systems?
- Type M
- Type L
- Type N
- Type K
9: How many gallons of water per pound of ammonia do you need?
- 20
- 15
- 5
- 1
10: What is a Category "M" fluid?
- 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
- A typical refrigerant used on newer air conditioning and heat pump systems
11: When should a relief valve start to function?
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
12: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Approved by the installing contractor
13: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but flammable
14: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 100%
- 80%
15: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
16: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- the liquid side of the system
- high side of the system
- low side of the system
17: A restaurant is classified as a
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
- mixed occupancy
18: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
19: The Department that certifies the transportation of refrigerant is the
- DOT
- EPA
- EPO
- RSES
20: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 1000F
- 600F
21: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- low limit control
- pressure relief device
- zone valve
22: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- leak checked
- moisture barrier
- insulated
23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- A group sensing
- phosgene gas sening
- refrigerant sensing
- CO Sensing
24: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
25: What kind of material can't be used on the outlet of a relief valve?
- Copper
- Stainless Steel
- PVC
- Aluminum