Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: Which refrigerant(s) is an HFC?
R-22
R-410A
R-502
All of the above
2: A relief valve shall be located at least ___ above grade.
10'
25'
15'
36'
3: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
1
1.5
1.2
2.2
4: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
44 lbs
22 lbs
6.6 lbs
13.9 lbs
5: Pressure vessels having an inside diameter of 6” or less shall be protected by
either a fusible plug or a pressure relief device
a pressure relief device
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
a fusible plug
6: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
True
False
7: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
UL and UR
UL and UM
UM or UL
UV or UR
8: 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
9: NH3 is
R-718
lithium bromide
R-508A
ammonia
10: 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
high side of the system
the liquid side of the system
low side of the system
11: What is the refrigerant chlorodifluoromethane?
R-12
R-22
R-123
R-134a
12: R-22 falls under which safety classification?
B-1
A-1
B-2
A-2
13: The Department that certifies the transportation of refrigerant is the
DOT
RSES
EPO
EPA
14: A declaration test is needed when the system contains more than
120 lbs
55 lbs
110 lbs
65 lbs
15: 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
16: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
high pressure
low pressure
design pressure
critical pressure
17: Direct systems using Group II refrigerants
shall be installed per instruction of the AHJ
shall not be used for air condition for human comfort
shall be allowed to be used for human comfort.
shall be installed in Class T machinery rooms
18: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
shall be prohibited
shall not be prohibited
containing R-11, R-123 & R-717 exclusively shall not be prohibited
of Group B2 refrigerant shall be prohibited
19: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
compressor
evaporator
boiler
outside the machinery room
20: Which refrigerant class listed below is the most flammable?
A2
A3
B2
C3
21: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
public assembly occupancy
illegal occupancy
commercial occupancy
institutional occupancy
22: What is R-22?
Chlorodifluoromethane
HFC
Chlorofluoromethane
CCFCM
23: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
True
False
24: All serviceable components of a refrigeration system shall be provided with
name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
manufactures instructions on start-up procedures
safe access
service manuals
25: All electrical work done on refrigeration systems must comply with