Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
500 lbs
330 lbs
660 lbs
55 lbs
2: When should a relief valve start to function?
10 psi before it's set pressure
At it's set pressure
Before the purge station discharges
Two times it's working pressure
3: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
350
250
400
100
4: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
99%
80%
75%
90%
5: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
fusion plug
relief plug
rupture plug
fusible plug
6: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
Because it's water
Because it's a non-flammable refrigerant
R-718 is not rated unlimited because it's a dangerous refrigerant
Because it's cheap
7: What kind of material can't be used on the outlet of a relief valve?
Copper
PVC
Stainless Steel
Aluminum
8: A hotel is considered a _______ occupancy.
institutional
commercial
mercantile
residential
9: 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
10: Setting a pressure relief device shall not exceed ___ of the design pressure
75%
80%
100%
90%
11: _____ and its alloys are suitable for use with ammonia systems.
Aluminum
Copper
Magnesium
Zinc
12: How many gallons of water do you need per pound of ammonia?
50
10
100
1
13: When air is ducted through a machine room that services occupied space, What must be done?
Flanged and gasketed
Insulated and cross broke
Welded and seamed.
Ducted and sealed
14: How much clearance do you need around the perimeter of electrical panels?
12"
36"
24"
18"
15: What refrigerant doesn't have to be classified?
R-422A
R-718
R-717
R-134A
16: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
over pressure protection as well as a temperature protection device
Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
over pressure protection
over pressure protection and a rupture disc
17: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
the atmosphere
a de-pressurized recovery tank with a silver top and yellow bottom
a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
All of the above
18: What was the main reason for enacting the no venting rule of July 1, 1992?
Ozone depletion
Green house effect
Global warming potential
All of the above
19: Evaporators within 18" of a heating coil must be equipped with a
high limit control
low limit control
zone valve
pressure relief device
20: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
21: 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
breaker panel in
first disconnect in
24 volt secondary side of the Class 2 transformer to the thermostat
22: What must be done to refrigerant pipes before being buried?
Coated
Leaked checked
Certified
Encased
23: 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
24: What is the refrigerant dichlorodifluoromethane?
R-123
R-134A
R-22
R-12
25: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.