Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Transformers are rated in
volts-ohms
volt-amps
amps
volts
2: A micron is
one millonths of a micrometer
one millonths of a centimeter
one thousandths of a millimeter
a larger unit of measurement than Hg
3: What must be done to refrigerant pipes before being buried ?(8.10.4)
Classifed
Leak checked
Certified
Insulated and installed in a pipe duct (Encased)
4: Trichlorofluoromethane is the name of what refrigerant?
R-11
R-113
R-12
R-502
5: Booster compressors, pump refrigerant into the
receiver
high side of the secondary compressor
low side of the primary compressor
heat & plate heat exchanges
6: What pipe can not be used for refrigeration?
L
M
K
N
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: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
orange
red
blue
green
9: What must be done if refrigeration lines pass through a concrete floor?
insulated
installed through a pipe casing
leak checked
moisture barrier
10: A motor starter is a device that includes an overload and a _______?
contactor
2-pole contacts
duel-coil
all of the above
11: R-22 is classified as a ____ refrigerant on the safety matrix.
A-2
B-1
B-2
A-1
12: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 20'
At least 40'
There is no minimum for relief valve and windows.
At least 30'
13: What is the refrigerant dichlorodifluoromethane?
R-134A
R-123
R-22
R-12
14: A class B2 refrigerant is considered
non-toxic and highly flammable
toxic and somewhat flammable
toxic and non-flammable
non-toxic and non-flammable
15: "I" represents _______ in the Watt's law formula.
watts
reactance
amperage
voltage
16: 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
24 volt secondary side of the Class 2 transformer to the thermostat
first disconnect in
breaker panel in
17: When air is ducted through a machine room that services occupied space, What must be done?
Insulated and cross broke
Welded and seamed.
Flanged and gasketed
Ducted and sealed
18: The best way to determine the voltage requirement for an electrical component is to
determine the capacity of the service panel
read the voltage with a mulitmeter
check with the utility company
read the nameplate data
19: The reversing valve is commonly used
when the code requires a check valve
on commercial system that involve two different temperatures
on multiple compressor systems
on all heat pumps
20: A restaurant is classified as a
large mercantile occupancy
mixed occupancy
commercial occupancy
public assembly occupancy
21: If a purge unit fails on a low pressure chiller, what are the symptoms?
low suction pressure
low pressure chillers do not have purge units
increased capacity
high head pressure
22: Clearance volume
is the same on all compressors
has no effect on compressor capacity
varies depending on compressor speed
affects compressor capacity
23: A EPR valve is installed on what type of evaporators?
high-temperature evaporators
low-temperature evaporators
shell and tube evaporators
plate evaporators
24: Refrigerant restricted in 2004 but used for transition for decades: