Topics: ASHRAE/CMR
1: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Self-closing doors
2: A positive displacement compressor is
- 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
- 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
3: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
- When its white
- When there are sprinklers above
4: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
5: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
6: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
7: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Circuit Breaker
- Relief valve
- T&P device
8: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on the oil used
- Based on worst case fractionation
- Based on best case Fractionation
9: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-12
- R-113
- R-22
- R-11
10: A Low-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 can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
11: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
12: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
13: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 3/32"
- 1/16"
- 1/8"
14: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 1000F
- 600F
- 800F
15: Ammonia can come in contact with _______ ?
- Aluminum
- Copper tubing
- Copper
- Brass
16: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 7.25'
- Ceiling height
- 72"
17: Liquid level gauges must be provided with what?
- A red line
- A low level mark
- A relief valve
- Automatic shut-offs
18: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- zone valve
- pressure relief device
- low limit control
19: 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
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 660 lbs
- 500 lbs
21: 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
22: Which refrigerant class listed below is the most flammable?
- C3
- B2
- A2
- A3
23: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
24: What section governs pressure vessels?
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- OSHA
- Section ASHREA 34
25: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct