Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
the return air ducted system
Machinery rooms need not be vented
the mechanical room housing the refrigeration system
the outdoors
2: How much refrigerant can be stored in a mechanical room outside of the system?
200
150
100
330
3: A class B2 refrigerant is considered
non-toxic and highly flammable
toxic and non-flammable
toxic and somewhat flammable
non-toxic and non-flammable
4: _____ and its alloys are suitable for use with ammonia systems.
Magnesium
Zinc
Copper
Aluminum
5: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“UV”
“UL”
“UM” and “UV”
“U” or “UM”
6: Ammonia belongs to Group
A-2
B-2
B-1
A-1
7: Name an HCFC refrigerant(s):
R-22
R-123
R-11
both a & b
8: Where are the three places that the discharge from an ammonia relief valve be piped?
To chemical neutralizing tank only
Underground, into drain, into mechanical room
Atmosphere, Tank containing water, where the AHJ indicates.
None of the above.
9: How many gallons of water per pound of ammonia do you need?
15
5
1
20
10: 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 ammonia
Flush with R-718
Flush with R-11
Flush with RX-11
11: 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
boiler
outside the machinery room
evaporator
12: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
1
1.2
1.5
2.2
13: R-22 is considered a(n)
HCFCH
CFC
HFC
HCFC
14: 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
first disconnect in
load-side of the contactor in
24 volt secondary side of the Class 2 transformer to the thermostat
breaker panel in
15: What is R-22?
Chlorodifluoromethane
CCFCM
Chlorofluoromethane
HFC
16: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
20
10
15
25
17: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
fusible plug
relief valve
rupture disc
all of the above
18: How many groups of refrigerants are there?
7
1
5
3
19: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
18
50
22
33
20: What refrigerant doesn't have to be classifted?
R-717
R-134a
R-711
R-718
21: What type of material can't be used on the outlet of a relief valve?
Copper
Magnesium alloy
PVC
Stainless steel
22: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
23: 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
24: Refrigerants shall be classified by
color codes
toxicity and flammability
maximum permissible quantities of each group
requirements for commercial, industrial, and residential occupancies
25: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
of Group B2 refrigerant shall be prohibited
shall not be prohibited
containing R-11, R-123 & R-717 exclusively shall not be prohibited