Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: 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 RX-11
Flush with R-718
Flush with ammonia
Flush with R-11
2: When a refrigeration or air conditioning system is installed
it shall be approved by the owner for proper operation.
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
3: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
fusible plug
relief plug
fusion plug
rupture plug
4: A relief valve discharge capacity is rated in
temperature minus pounds of air per second divided by release rate squared
PSIA
Pounds of air per minute.
PSIG
5: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
6.6
110
330
1,000
6: What refrigerant is an inorganic compound?
Ammonia
R-132A
R-22
R-410A
7: Single compound Refrigerants are classified by what two criteria?
Weight and color
Flammability and toxicity
Temperature range and hazardousness
Flammability and temperature range
8: A relief valve shall be located at least ___ above grade.
15'
36'
25'
10'
9: A class B1 refrigerant is considered
non-toxic and non-flammable
toxic and somewhat flammable
toxic but non-flammable
non-toxic but highly flammable
10: When a refrigerating machinery room is used, the emergency procedures shall be posted
on a conspicuous card located near the evaporator
inside the room, immediately adjacent to each door
outside the room, immediately adjacent to each door
on a conspicuous card located near the compressor
11: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
12: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
refrigerant sensing
A group sensing
phosgene gas sening
CO Sensing
13: _____ alloys shall not be used in contact with an halogenated refrigerants.
Copper
Magnesium
Nickel
Zinc
14: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
15: What is an egress?
An escape route
A code violation
A valve put on the low side of the system to prevent frosting
An entrance or exit
16: 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
boiler
evaporator
compressor
outside the machinery room
17: 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
licensed technician
licensed welder
competent welder
welder qualified
18: How many different groups of refrigerants are there?
7
11
3
15
19: Refrigerants shall be classified by
toxicity and flammability
maximum permissible quantities of each group
requirements for commercial, industrial, and residential occupancies
color codes
20: 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)
institutional occupancy
commercial occupancy
public assembly occupancy
illegal occupancy
21: What refrigerant doesn't have to be classifted?
R-718
R-717
R-134a
R-711
22: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
True
False
23: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
gas masks must be worn
no flames shall be permitted
explosion precautions must be taken
the owner shall be informed
24: The gauge thickness required on a CO2 tank construction is
1/8"
5/16"
3/32"
1/16"
25: Refrigerant restricted in 2004 but used for transition for decades: