Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: 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
2: A relief valve shall be located at least ___ above grade.
10'
15'
36'
25'
3: Who authorizes changes to the safety codes?
Person in charge of the facility
Person who pulled the permit
Board of Boilers
Contractor who last serviced the system.
4: 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
outside the machinery room
boiler
5: Pressure relief valves shall be marked with the data from
Section IV Division of the ASME Boiler & Pressure Code
Section I Division VIII of ASME Boiler & Pressure Code
Section XIII Division of the ASME Boiler & Pressure Code
Section VIII Division of the ASME Boiler & Pressure Code
6: How many groups of refrigerants are there?
5
3
7
1
7: Where must a refrigeration contractor's license number be displayed?
Trucks, license plates, and uniforms
Trucks, invoices, and advertising
Truck, office, every job, and on all equipment
Uniforms, checks, and invoices.
8: What is the refrigerant chlorodifluoromethane?
R-134a
R-22
R-123
R-12
9: What type of relief valve is used on low pressure centrifugal compressor systems?
Spring-loaded relief valve
Rupture disc
Purge relief
None of the above
10: 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)
commercial occupancy
institutional occupancy
illegal occupancy
public assembly occupancy
11: Who approves containers for refrigerants?
D.O.T
D.O.E
D.O.D
E.P.A
12: Which refrigerant class listed below is the most flammable?
A-3
B-2
A-1
C-3
13: What refrigerant doesn't have to be classifted?
R-711
R-717
R-134a
R-718
14: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
90%
75%
100%
80%
15: A movie theater would be considered a
commercial occupancy
mixed occupancy
public assembly occupancy
institutional occupancy
16: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
Because it's a non-flammable refrigerant
Because it's cheap
R-718 is not rated unlimited because it's a dangerous refrigerant
Because it's water
17: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
660 lbs
500 lbs
55 lbs
330 lbs
18: What was the main reason for enacting the no venting rule of July 1, 1992?
Ozone depletion
Green house effect
Global warming potential
All of the above
19: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
Flush with R-11
Flush with RX-11
Flush with R-718
Flush with ammonia
20: Which refrigerant class listed below is the most flammable?
B2
A3
C3
A2
21: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
you can't change refrigerants
place sign, check for leaks, insulate
make sure it's compatible, notify owner, notify A.H.J
nothing must be done
22: The color code of a tank of ammonia is
white
light green
silver
lavender
23: What must be done if refrigeration lines pass through a concrete floor?
installed through a pipe casing
moisture barrier
insulated
leak checked
24: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
50
25
22
66
25: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.