Topics: ASHRAE/CMR
1: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- explosion precautions must be taken
- no flames shall be permitted
- gas masks must be worn
- the owner shall be informed
2: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 550
- 350
- 50
3: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
- the return air ducted system
4: Pipe identification labels are required when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
5: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
6: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.2
- 1.5
- 2.2
7: How many refrigerant classifications are there for flammability?
- 2
- 3
- 1
- 7
8: Ammonia can come in contact with _______ ?
- Copper tubing
- Brass
- Aluminum
- Copper
9: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
10: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
11: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
12: Ammonia is under what safety classification?
- B1
- B3
- B2
- A3
13: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
14: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 5 CFM
- 15 CFM
- 20 CFM
15: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
16: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
17: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
18: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- zone valve
- low limit control
- high limit control
19: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
20: A class A3 refrigerant is considered
- non-toxic but highly flammable
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
21: Most CFC's are
- flammable
- inert but toxic
- toxic
- inert
22: What do you need to do when you install a new system?
- Have it inspected
- Add refrigerant
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
23: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
24: What pipe can not be used for refrigeration?
- K
- L
- N
- M
25: A relief valve shall be located at least ___ above grade.
- 10'
- 25'
- 15'
- 36'