Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Pressure vessels with an internal volume of 3 cubic feet or more
shall use fusible plugs
do not need pressure relief protection
shall use pressure relief devices
shall use pressure relief devices or fusible plugs
2: On a single phase motor, when does the start winding cut out?
25% of its RLA speed
75% of its RLA speed
50% of its RLA speed
100% of its RLA speed
3: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
4: R-123 belongs to Group
A-3
B-1
B-2
B-3
5: A moisture indicator must
be filled with liquid
be yellow
change color when exposed to moisture
be sight side up
6: Sensible heat is the heat added to a substance to
freeze it
change its state
cause evaporation
raise its temperature
7: 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
8: A micron is
one millonths of a micrometer
one thousandths of a millimeter
one millonths of a centimeter
a larger unit of measurement than Hg
9: A class B1 refrigerant is considered
non-toxic but highly flammable
toxic but non-flammable
toxic and somewhat flammable
non-toxic and non-flammable
10: 746 watts is equal to
Pi
10 hp
100 hp
1 hp
11: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
12: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
24
10
18
15
13: How many refrigerant classifications are there for flammability?
2
1
3
7
14: "I" represents ____ in the Ohm's law formula.
capacitance
resistance
voltage.
amperage
15: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
annually
quarterly
bi-annually
regularly
16: Class A refrigerants are considered
non-toxic
non-flammable
flammable
toxic
17: A split-phase motor has a ______ winding and a ____ winding
start, common
run, common
run, start
duel-run, duel-start
18: A mixed occupancy occurs when two or more occupancies are located with the same building
true
false
19: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, pressure, and dipstick
Buss-eye, weight, pressure, and frost line
sight glass, weight, paper method, and frost line.
sight glass, weight, pressure, and frost line
20: What is absolute humidity?
the amount of moisture in the air per one pound of 50% RH air
the amount of moisture in the air in grains of cubic feet of volume
the amount of moisture in the air in grains of square feet of volume
none of the above
21: Direct systems using Group II refrigerants
shall be allowed to be used for human comfort.
shall not be used for air condition for human comfort
shall be installed per instruction of the AHJ
shall be installed in Class T machinery rooms
22: Increasing superheat will do what to your system?
Nothing
Decrease liquid flow
Increase liquid flow
Increase gas flow
23: The freezing point of water at sea level is?
0F
32F
-10C
32C
24: What happens after your initial inspection of a pressure vessel?
There is a temporary shut-down until a final inspection can be performed.
Inspector leaves a metal tag with a certification listed on it
Notify the Fire Marshal that the system has been inspected and approved
Notify the AHJ to let them know that the system been inspected
25: _____ and its alloys are suitable for use with ammonia systems.