Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What kind of material can't be used on the outlet of a relief valve?
Copper
Stainless Steel
Aluminum
PVC
2: If a condenser is on a roof and the temperature is 35F and dropping the capacity
increases
run as designed with low ambient controls
doesn't change
decreases
3: 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.
4: Capacity control on a centrifugal compressor is accomplished by the
check valves
post-rotational guide vanes
slide vanes
pre-rotational guide vanes
5: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
20 amps
10 amps
5 amps
15 amps
6: The generator shell contains the
condenser, the evaporator, and the generator
condenser and the absorber
evaporator and the absorber
condenser and the generator
7: A low oil switch is typically
time-delay auto reset
manual reset
non used on semi-hermetic compressors over 10 ton capacity
automatic reset
8: Ammonia vaporization takes place at what temperature?
-28F
-32F
-460F
-110F
9: A run capacitor is wired in series with the _____ windings.
run
start
start capacitor
common
10: Before replacing a seized compressor, the _______ should be determinded.
current draw
type of refrigerant
cause of seizure
designed head pressure
11: What type of copper is not permitted on refrigeration systems?
Type M
Type L
Type N
Type K
12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
color-coded glass to determine type of refrigerant
moisture indicators
automatic closing shut-off valves
All of the above
13: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
there is no Group B1 refrigerants
the same
higher
lower
14: Thermodynamics is the branch of science that deals with
heat energy
molecular therory
energy due to motion
state of energy
15: How many square inches per square foot?
144
98
64
24
16: How many groups of refrigerants are there?
1
3
7
5
17: What is the boiling point of refrigerant governed by?
Evaporator temperature
Compressor RPM's
Condenser sub-cooling
P&T relationship
18: 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
19: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
boiler
evaporator
outside the machinery room
compressor
20: Total heat of a substance is considered
empathetical
enthalpy
sensible heat
specific heat
21: What is the typical air conditioning operating pressures for R-22?
60 psi suction 210 psi discharge
25 psi suction 125 psi discharge
105 psi suction 340 psi discharge
None of the above
22: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
drawing RLA and is running as it should
drawing LRA and is seized and should be replaced.
running hot
none of the above
23: 1 Watt = ______ BTU's?
7.216
3.412
12
4.482
24: How much refrigerant can be stored in a mechanical room outside of the system?
100
330
150
200
25: What is not a requirement of a class T machine room?
fire hose connection to the building fire protection system