Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
2.5
3.0
2.0
5.5
2: What is not a requirement of a class T machine room?
self-closing doors
automatic ventilation
fire hose connection to the building fire protection system
tight fitting doors
3: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
you can never change refrigerants
Nothing must be done
Make sure its compatible, notify owner, and notify AHJ.
Place sign, check for leaks, and insulate suction line
4: Trichlorofluoromethane is the name of what refrigerant?
R-113
R-502
R-12
R-11
5: Pressure vessels with an internal volume of 3 cubic feet or more
do not need pressure relief protection
shall use fusible plugs
shall use pressure relief devices
shall use pressure relief devices or fusible plugs
6: A class A3 refrigerant is considered
toxic and non-flammable
non-toxic but highly flammable
toxic and somewhat flammable
non-toxic and non-flammable
7: The gauge thickness required on a CO2 tank construction is
1/16"
5/16"
3/32"
1/8"
8: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 20'
At least 30'
At least 40'
There is no minimum for relief valve and windows.
9: How many different groups of refrigerants are there?
7
3
15
11
10: 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
11: 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
12: A High-Probablity system
is such that a leak of refrigerant from failed connections will enter the unoccupied space
is such that any leak will cause injury or death to anyone within a 100 square foot area
is such that a leak of refrigerant from failed connections will enter the occupied space
is a system highly likely to leak from a failed connection or component of such system
13: Ammonia is under what safety classification?
B3
A3
B2
B1
14: Who is permitted to access a refrigeration machine room?
Authorized persons only
Contractors only
Anyone, it's a completely safe area
Any employee
15: A class B1 refrigerant is considered
toxic but non-flammable
non-toxic and non-flammable
non-toxic but highly flammable
toxic and somewhat flammable
16: Which of the following is an inorganic refrigerant?
R-22
Ammonia
Chlorofluorocarbons
All of the above
17: 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
18: _____ alloys shall not be used in contact with an halogenated refrigerants.
Copper
Zinc
Nickel
Magnesium
19: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
20: What is R-22?
Chlorodifluoromethane
HFC
Chlorofluoromethane
CCFCM
21: Setting a pressure relief device shall not exceed ___ of the design pressure
90%
75%
80%
100%
22: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
20
15
25
10
23: What is an egress?
An escape route
A valve put on the low side of the system to prevent frosting
A code violation
An entrance or exit
24: R-11 belongs to Group
A-2
B-1
B-3
A-1
25: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)