Topics: ASHRAE/CMR
1: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Flammability and toxicity
- Weight and color
- Temperature range and hazardousness
2: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- moisture barrier
- installed through a pipe casing
- leak checked
3: A restaurant is classified as a
- large mercantile occupancy
- public assembly occupancy
- commercial occupancy
- mixed occupancy
4: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- 20 CFM
- .5 CFM
- 5 CFM
5: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class M machinery room
- Class T machinery room
- Class B machinery room
6: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 40'
- At least 30'
- At least 20'
7: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
8: 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
9: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
10: What do you need to do when you install a new system?
- Have it inspected
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
- Add refrigerant
11: Large mercantile occupancy is
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
12: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
13: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
14: Pipe identification labels are required when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs
15: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- Halon
- HCFC
16: The color code of a tank of ammonia is
- light green
- lavender
- silver
- white
17: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- The company who installed the system must notify the fire department in the jurisdiction where installed
- the form or certificate shall be authorized by the Department of Public Safety
- A field inspection shall be made before it is put into service
18: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- service manuals
- safe access
19: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 99%
- 80%
- 75%
20: High pressure controls should be set no higher than
- 25% of set point
- 90% of set point
- 80% of set point
- 10% of set point
21: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
22: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
23: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 25' above grade
- At least 15' above grade
24: NH3 is
- ammonia
- R-718
- R-508A
- lithium bromide
25: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 55
- 15
- 50