Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: 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
2: 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
3: How many refrigerant classifications are there for flammability?
2
7
1
3
4: How much clearance do you need around the perimeter of electrical panels?
36"
24"
18"
12"
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: 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.
“U” or “UM”
“UM” and “UV”
“UL”
“UV”
7: A professional or office building would be considered what type of occupancy?
business
public assembly
mercantile
commercial
8: 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 R-11
Flush with RX-11
Flush with R-718
Flush with ammonia
9: 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
breaker panel in
24 volt secondary side of the Class 2 transformer to the thermostat
load-side of the contactor in
10: R-11 belongs to Group
B-1
A-1
A-2
B-3
11: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
the owner shall be informed
gas masks must be worn
explosion precautions must be taken
no flames shall be permitted
12: 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.
50
350
550
100
13: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
color-coded glass to determine type of refrigerant
moisture indicators
automatic closing shut-off valves
All of the above
14: Direct systems using Group II refrigerants
shall be allowed to be used for human comfort.
shall be installed in Class T machinery rooms
shall not be used for air condition for human comfort
shall be installed per instruction of the AHJ
15: What type of relief valve is used on low pressure centrifugal compressor systems?
Spring-loaded relief valve
Rupture disc
Purge relief
None of the above
16: The Board of Boilers adopts by reference
MSCA Code
the MACS Pressure Vessel Code of Massachusetts
Montreal Protocol Safety Code
the 1997 ANSI/ASHRAE Safety Code
17: Refrigerants shall be classified by
color codes
requirements for commercial, industrial, and residential occupancies
maximum permissible quantities of each group
toxicity and flammability
18: How many CFMs are required per square foot of commercial office occupied space
15 CFM
.5 CFM
20 CFM
5 CFM
19: How many groups of refrigerants are there?
5
3
7
1
20: When must refrigeration system covered by the code be inspected?
Annually and when installed
Not required
Annually
Upon installation
21: R-22 is classified as a ____ refrigerant on the safety matrix.
A-1
A-2
B-2
B-1
22: Pipe identification labels are required when the system contains more than
55 lbs
65 lbs
110 lbs
120 lbs
23: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
99%
90%
80%
75%
24: A relief valve discharge capacity is rated in
Pounds of air per minute.
temperature minus pounds of air per second divided by release rate squared