Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: 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
2: When a refrigeration or air conditioning system is installed
a field inspection shall be made before it is put into service
the form of certificate shall be authorized by the Department of Pubic safety
it shall not be operated below prescribed pressures
it shall be approved by the owner for proper operation.
3: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
rupture plug
relief plug
fusible plug
fusion plug
4: R-123 belongs to Group
B-1
B-3
A-3
B-2
5: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
Nothing must be done
Make sure its compatible, notify owner, and notify AHJ.
you can never change refrigerants
Place sign, check for leaks, and insulate suction line
6: Pressure vessels having an inside diameter of 6” or less shall be protected by
a fusible plug
a pressure relief device
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
either a fusible plug or a pressure relief device
7: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
lower
higher
the same
there is no Group B1 refrigerants
8: When an inspection is needed, how often must it be done?
annually
every 36 months
every 18 months
every 24 months
9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
500 lbs
660 lbs
55 lbs
330 lbs
10: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
330
1,000
110
6.6
11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
public assembly occupancy.
commercial occupancy
business occupancy
mercantile occupancy
12: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
13: 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.
15
20
25
10
14: How many gallons of water per pound of ammonia do you need?
20
1
5
15
15: _____ and its alloys are suitable for use with ammonia systems.
Zinc
Aluminum
Copper
Magnesium
16: Most CFC's are
inert but toxic
inert
flammable
toxic
17: What must be done to refrigerant pipes before being buried ?(8.10.4)
Certified
Insulated and installed in a pipe duct (Encased)
Classifed
Leak checked
18: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
19: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
22
25
50
66
20: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
22 lbs
44 lbs
6.6 lbs
13.9 lbs
21: What type of relief valve is used on a CO2 system?
glove disc
gate valve
rupture disc
fusible plug
22: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
welder qualified
licensed technician
licensed welder
competent welder
23: A declaration test is needed when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
24: _____ alloys shall not be used in contact with an halogenated refrigerants.
Magnesium
Zinc
Nickel
Copper
25: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and