Massachusetts Refrigeration Tech/Contractors practice quiz
ASHRAE/CMR code Prep Quiz
Topics: ASHRAE/CMR
1: The discharge relief valve is located (9.4.6)
between the compressor and the stop valve
between the compressor and oil separator
between the compressor and reciever
on top of the condensor
2: What type of material can't be used on the outlet of a relief valve?
Magnesium alloy
Stainless steel
PVC
Copper
3: Single compound Refrigerants are classified by what two criteria?
Temperature range and hazardousness
Weight and color
Flammability and toxicity
Flammability and temperature range
4: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
550 lbs
660 lbs
55 lbs
330 lbs.
5: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
2.5, 2.5
3.0, 3.5
2.5, 3.0
6.6, 6.6
6: The main cause of enacting the "no vending rule" of July 1st 1992 was
global warming potential
ozone depletion
both a & b
None of the above
7: 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
8: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
80%
99%
75%
90%
9: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
the aggregate of the high side and low side
the low side
the high side
2.5 times the design pressure
10: A hotel is considered a _______ occupancy.
commercial
institutional
mercantile
residential
11: 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
breaker panel in
24 volt secondary side of the Class 2 transformer to the thermostat
first disconnect in
load-side of the contactor in
12: What does safe access mean?
A clear unobstructed path to the equipment and controls
OSHA approved
Well-lit exit signs
Locked doors
13: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
high side of the system
the vapor side of the system
the liquid side of the system
low side of the system
14: How much clearance do you need around the perimeter of electrical panels?
24"
12"
36"
18"
15: Pressure vessels having an inside diameter of 6” or less shall be protected by
either a fusible plug or a pressure relief device
a fusible plug
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
a pressure relief device
16: Liquid level gauges must be provided with what?
A relief valve
A red line
A low level mark
Automatic shut-offs
17: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
Place sign, check for leaks, and insulate suction line
Make sure its compatible, notify owner, and notify AHJ.
you can never change refrigerants
Nothing must be done
18: Halogenated refrigerants cannot be used with what material?
Aluminum
Copper
Magnesium alloy
Stainless steel
19: When a refrigeration or air conditioning system is installed
the form of certificate shall be authorized by the Department of Pubic safety
a field inspection shall be made before it is put into service
it shall not be operated below prescribed pressures
it shall be approved by the owner for proper operation.
20: Trichlorofluoromethane is the name of what refrigerant?
R-502
R-113
R-11
R-12
21: How many different groups of refrigerants are there?
7
15
3
11
22: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
48
36
24
18
23: Industrial occupancy is
a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
Both a and b are correct
24: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
25: When air is ducted through a machine room that services occupied space, What must be done?