Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
king valves
companion or block valves
gate or globe valves
ball valves
2: A start capacitor is wired in _____ with the start windings.
series-parallel
parallel
junction
series
3: The outer portion of shell of the compressor used on low-pressure chillers is called the
baffle
nozzle
suction
volute
4: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
9.00'
8'4"
7.25'
7.00'
5: Doors communicating with outside from a mechanical room must be?
Self-closing, wooden, fire door
Steel, approved, weather-stripped
Self-closing, aligned, fire door
Self-closing, approved, fire door
6: "I" represents ____ in the Ohm's law formula.
voltage.
resistance
capacitance
amperage
7: The measurement of heat in a particular substance is
enthalpy
sensible heat
specific heat
latent heat
8: The high side float assembly meters refrigerant into the evaporator through the
upper chamber of the high side
lower chamber of the low side
upper chamber of the low side
lower chamber of the high side
9: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
10: What type refrigerant is NOT ozone depleting?
HFC
CFC
Halon
HCFC
11: The rupture disc on a low-pressure chiller typically releases pressure at
0 psig
15 psig
10 psig
5 psig
12: In designing duct work, pressure and ______ need to be considered
length
CFM
duct sealant used
all of the above
13: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
commercial occupancy
business occupancy
public assembly occupancy.
mercantile occupancy
14: What happens after your initial inspection of a pressure vessel?
Inspector leaves a metal tag with a certification listed on it
There is a temporary shut-down until a final inspection can be performed.
Notify the AHJ to let them know that the system been inspected
Notify the Fire Marshal that the system has been inspected and approved
15: How can you test mechanical strength of an electrical connection?
measure ohms with an electrical meter
measure voltage across the connection
attempt to pull the wire from the connector by hand
none of the above.
16: _____ and its alloys are suitable for use with ammonia systems.
Zinc
Aluminum
Magnesium
Copper
17: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
When there are sprinklers above
When there is a space 6' or more above it
When it's used as part of a supply or return air system
When its white
18: In an A/C unit, dirty filters will cause
high discharge pressure
low oil pressure
low suction pressure
high suction pressur
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 frost line
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
sight glass, weight, paper method, and frost line.
20: The amount of heat required to raise the temperature of 1 lb of water 1F is?
The rate of conduction
1 Kelvin
1 Therm
1 BTU
21: The normal operating evaporator temperature of R-410A for air conditioning is typically
158F
32F
45F
155F
22: Three-phase motors have what type of windings?
three start windings
three run windings and 3 start windings
one start winding and one run winding.
three run windings
23: A hissing noise at the expansion valve is a good indication that
expansion valve is oversized
gas is passing thru it
liquid is passing thru it
nothing is passing thru
24: What refrigerant doesn't have to be classifted?