Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: All machine rooms must be outfitted with a detector that _______?
activates an audible alarm
activates a visual alarm
starts the ventilation system
All of the above
2: No open flames are allowed in the machinery room unless?
Never can be allowed
Approved by the installing contractor
Only when combustion air is provided from outside of the machinery room
Approved by the authorized person
3: R-410A is classified as a ____ refrigerant on the safety matrix.
B-2
B-1
A-2
A-1
4: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
no flames shall be permitted
gas masks must be worn
the owner shall be informed
explosion precautions must be taken
5: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
When there is a space 6' or more above it
When it's used as part of a supply or return air system
When its white
When there are sprinklers above
6: What is R-22?
CCFCM
HFC
Chlorofluoromethane
Chlorodifluoromethane
7: Can ammonia be used on domestic system?
no
no, unless there is proper ventilation system installed
yes, for systems under 10 tons
yes
8: Class A refrigerants are considered
non-toxic
non-flammable
toxic
flammable
9: What would be the classification of a prison?
Large mercantile
Place of assembly
Industrial
Institutional
10: Pressure vessels nameplate markings must be compliant with the
ASHRAE 34 Standards
CMR-588 & CMR-528
ASME Boiler and Pressure Vessel Code
All of the Above
11: Fusible plugs shall not be used with pressure vessels of
3 cubic feet or less
15 square feet or less
3 cubic feet or more
15 cubic feet or more
12: 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
13: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
quarterly
regularly
bi-annually
annually
14: 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
15: What type refrigerant is NOT ozone depleting?
HCFC
CFC
Halon
HFC
16: What pipe can not be used for refrigeration?
K
L
N
M
17: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
110
90
100
80
18: 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
a fusible plug
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
19: When a refrigeration or air conditioning system is installed
it shall be approved by the owner for proper operation.
it shall not be operated below prescribed pressures
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
20: B3 refrigerants are considered
non-toxic but non-flammable
toxic but non-flammable
toxic and highly flammable
non-toxic but flammable
21: Doors communicating with outside from a mechanical room must be?
Self-closing, approved, fire door
Steel, approved, weather-stripped
Self-closing, wooden, fire door
Self-closing, aligned, fire door
22: A class B1 refrigerant is considered
non-toxic and non-flammable
non-toxic but highly flammable
toxic and somewhat flammable
toxic but non-flammable
23: Trichlorofluoromethane is the name of what refrigerant?
R-113
R-11
R-502
R-12
24: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
2.5 times the design pressure
the aggregate of the high side and low side
the high side
the low side
25: What do you need to do when you install a new system?
Document the superheat and subcooling reading
Have it inspected
Insulate the suction line before you take a superheat reading