Topics: ASHRAE/CMR
1: R-717 is
- water
- ammonia
- carbon dioxide
- trichloromethane
2: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
3: How many gallons of water per pound of ammonia do you need?
- 5
- 1
- 20
- 15
4: Most CFC's are
- toxic
- flammable
- inert but toxic
- inert
5: Who approves containers for refrigerants?
- D.O.T
- E.P.A
- D.O.D
- D.O.E
6: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the high side
- 2.5 times the design pressure
- the low side
- the aggregate of the high side and low side
7: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
8: What would be the classification of a church?
- Place of assembly
- Large mercantile
- Industrial
- Institutional
9: NH3 is
- R-718
- ammonia
- lithium bromide
- R-508A
10: What pipe can not be used for refrigeration?
- M
- K
- N
- L
11: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
12: How many different groups of refrigerants are there?
- 7
- 15
- 3
- 11
13: 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.
- 7.25'
- 9.00'
- 7.00'
- 8'4"
14: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
15: What is an egress?
- A code violation
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- An escape route
16: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
17: 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
- low side of the system
- high side of the system
18: Ammonia (NH3) is a group III refrigerant
- True
- False
19: What is a Category "M" fluid?
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- 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
20: High pressure controls should be set no higher than
- 80% of set point
- 10% of set point
- 25% of set point
- 90% of set point
21: 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.
- 350
- 250
- 400
- 100
22: A declaration test is needed when the system contains more than
- 120 lbs
- 110 lbs
- 55 lbs
- 65 lbs
23: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
24: 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
25: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above