Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
13.9 lbs
44 lbs
6.6 lbs
22 lbs
2: What is an example of institutional occupancy?
Football stadium
Hospital
Shopping mall
Dorms
3: Which refrigerant(s) is an HFC?
R-22
R-410A
R-502
All of the above
4: A EPR valve is installed on what type of evaporators?
high-temperature evaporators
low-temperature evaporators
plate evaporators
shell and tube evaporators
5: 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
6: Which of the following is NOT a positive displacement compressor?
scroll
centrifugal
reciprocating
screw
7: Start to Run windings will have what resistance?
The most resistance value
The least resistance value
All will be at equal values
Somewhere between the actual start winding and run winding resistance value
8: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
3/4"
3/8"
5/8"
1/2"
9: High pressure controls should be set no higher than
80% of set point
25% of set point
90% of set point
10% of set point
10: Laten heat is associated with a change in state of a refrigerant but not temperature
True
False
11: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
10
15
25
20
12: A 24 volt transformer with a 240 volt primary can handle how many amps?
20 amps
24 amps
There isn't enough information to answer.
10 amps
13: A start capacitor in series with a start winding will
decrease the amp draw of the motor
increase starting torque
increase running efficiency
increase the amp draw of the motor
14: At higher altitudes, boiling temperatures
decrease
depends on the refrigerant
increase
are unaffected
15: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
16: What is the leaving chilled water set point for water chiller systems?
38F
45F
55F
66F
17: A start capacitor is wired in _____ with the start windings.
parallel
junction
series-parallel
series
18: Viscosity is
measure of weight
a measure of heat content
the coefficient of external friction
the ability of oil to flow
19: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
330
1,000
110
6.6
20: Can ammonia be used on domestic system?
no, unless there is proper ventilation system installed
no
yes, for systems under 10 tons
yes
21: The two basic types of evaporators are
finned and plate
prime surface and finned
flooded and direct expansion
direct expansion and plate
22: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
lost heat
specific heat
sensible heat
latent heat
23: Clearance volume
has no effect on compressor capacity
affects compressor capacity
varies depending on compressor speed
is the same on all compressors
24: A class B2 refrigerant is considered
toxic and somewhat flammable
non-toxic and non-flammable
non-toxic and highly flammable
toxic and non-flammable
25: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.