Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: Stop valves shall not be permitted between the system and the
relief valve
bleed valve
service valve
condenser
2: R-717 is
trichloromethane
carbon dioxide
water
ammonia
3: When a refrigerating machinery room is used, the emergency procedures shall be posted
on a conspicuous card located near the evaporator
outside the room, immediately adjacent to each door
on a conspicuous card located near the compressor
inside the room, immediately adjacent to each door
4: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
over pressure protection as well as a temperature protection device
over pressure protection
over pressure protection and a rupture disc
5: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 40'
At least 20'
There is no minimum for relief valve and windows.
At least 30'
6: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
6.6
330
1,000
110
7: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
refrigerant sensing
CO Sensing
A group sensing
phosgene gas sening
8: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
breaker panel in
first disconnect in
24 volt secondary side of the Class 2 transformer to the thermostat
load-side of the contactor in
9: An example of direct system is
rooftop unit
chiller
absorber
none of the above
10: A class B1 refrigerant is considered
toxic and somewhat flammable
toxic but non-flammable
non-toxic and non-flammable
non-toxic but highly flammable
11: When an inspection is needed, how often must it be done?
every 18 months
every 36 months
annually
every 24 months
12: What section of ASHRAE-15 governs pressure vessels?
Section 6 ASHRAE-34 ASME VIII unfired
Section 9 ASHRAE-15 ASME VIII unfired
Section 7 ASHRAE-15 ASME VIII fired
OSHA
13: Can ammonia be used on domestic system?
no
yes
no, unless there is proper ventilation system installed
yes, for systems under 10 tons
14: NH3 is
R-508A
R-718
ammonia
lithium bromide
15: 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
16: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
shall have a pressure limiting device installed on the high side of the system
shall be inspected by the Boiler of Inspectors bi-annually
shall have a pressure limiting device and a pressure relief valve installed
does not require a pressure-limiting device
17: 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
18: Refrigerant restricted in 2004 but used for transition for decades:
R-22
R-134A
R-123
R-11
19: Where are the three places that the discharge from an ammonia relief valve be piped?
atmosphere, tank containing water, where the A.H.J. indicates
underground, into drain, into mechanical room
to chemical neutralizing tank only
none of the above
20: 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)
Pressure gauge
Temperature gauge
Sight glass gauge
All of the above
21: 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 low side
the high side
the aggregate of the high side and low side
2.5 times the design pressure
22: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
high pressure
critical pressure
low pressure
design pressure
23: Halogenated refrigerants cannot be used with what material?
Stainless steel
Copper
Magnesium alloy
Aluminum
24: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
you can never change refrigerants
Place sign, check for leaks, and insulate suction line
Make sure its compatible, notify owner, and notify AHJ.
Nothing must be done
25: How many CFMs are required per square foot of commercial office occupied space