Topics: ASHRAE/CMR
1: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Copper
- Stainless steel
- Aluminum
2: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
3: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
4: A positive displacement compressor is
- 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
- 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 volume of the compression chamber
5: How are refrigerant blends classified?
- Based on the oil used
- Blends don't have to be classified
- Based on best case Fractionation
- Based on worst case fractionation
6: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- installed through a pipe casing
- moisture barrier
- insulated
7: High pressure controls should be set no higher than
- 80% of set point
- 25% of set point
- 90% of set point
- 10% of set point
8: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.00'
- 9.00'
- 7.25'
- 8'4"
9: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the outdoors
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
10: How many gallons of water do you need per pound of ammonia?
- 1
- 50
- 100
- 10
11: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 3 cubic feet or more
- 15 square feet or less
- 15 cubic feet or more
12: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
13: Refrigerants shall be classified by
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- color codes
- maximum permissible quantities of each group
14: What must be done to refrigerant pipes before being buried?
- Coated
- Encased
- Leaked checked
- Certified
15: A class B1 refrigerant is considered
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
16: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
17: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
18: A movie theater would be considered a
- mixed occupancy
- public assembly occupancy
- commercial occupancy
- institutional occupancy
19: How many groups of refrigerants are there?
- 3
- 1
- 5
- 7
20: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 400
- 100
- 350
- 250
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-12
- R-22
- R-11
- R-113
22: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
23: What is an egress?
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- An escape route
- A code violation
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.
- 80
- 90
- 100
- 110
25: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above