Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
22 lbs
44 lbs
6.6 lbs
13.9 lbs
2: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
550
100
350
50
3: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
A group sensing
CO Sensing
refrigerant sensing
phosgene gas sening
4: Halo-carbon refrigerants cannot be used with what material?
Aluminum
Copper
Magnesium alloy
Stainless Steel
5: 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
6: Class A refrigerants are considered
non-toxic
flammable
toxic
non-flammable
7: A Low-Probability System
is a system highly likely to leak form a failed connection or component of such system
is such that a leak of refrigerant from a failed connection can not enter the occupied space
is such that a leak of refrigerant from a failed connection will enter the occupied space
is such that any leak will cause injury or death to anyone within a 100 square foot area
8: 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
9: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
50
75
55
15
10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
Lithium bromide
ammonia
HCFC-123
CFC-11
11: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
12: Where must a refrigeration contractor's license number be displayed?
Trucks, invoices, and advertising
Uniforms, checks, and invoices.
Trucks, license plates, and uniforms
Truck, office, every job, and on all equipment
13: How many gallons of water per pound of ammonia do you need?
1
5
15
20
14: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
True
False
15: What is not a requirement of a Class T machine room?
Self-closing doors
Fire hose connected to the building fire protection system.
Tight fitting doors
Automatic ventilation
16: What must be done to all doors and access points in duct work going through a mechanical room?
Must be hindged
Must be screwed shut
Must be sealed and gasketed
All of the above
17: _____ and its alloys are suitable for use with ammonia systems.
Copper
Aluminum
Magnesium
Zinc
18: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
Moisture indicator
Muffler
Stop valve
Foot valve
19: Ammonia can come in contact with _______ ?
Aluminum
Brass
Copper tubing
Copper
20: Fusible plugs shall not be used with pressure vessels of
3 cubic feet or more
15 square feet or less
3 cubic feet or less
15 cubic feet or more
21: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
700F
600F
800F
1000F
22: 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
outside the machinery room
compressor
evaporator
boiler
23: A class B1 refrigerant is considered
non-toxic but highly flammable
non-toxic and non-flammable
toxic and somewhat flammable
toxic but non-flammable
24: How many gallons of water do you need per pound of ammonia?
50
10
100
1
25: 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
load-side of the contactor in
first disconnect in
breaker panel in
24 volt secondary side of the Class 2 transformer to the thermostat