Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What is the purpose of a surge capacitor on a contactor?
to protect low voltage equipment
to provide smoother start/stops
to balance the sine waves
to keep the contactor pulled in
2: 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
3: Laten heat is associated with a change in state of a refrigerant but not temperature
True
False
4: On a TXV, the purpose of an external equalizer is to?
compensate for a pressure drop across the evaporator coil
balance the evaporator load
allow a greater adjustment spam
Increase the pressure on the top of the power head diaphragm
5: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
800F
700F
1000F
600F
6: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
2.2
1.5
1.2
1
7: A 24 volt transformer with a 240 volt primary can handle how many amps?
20 amps
There isn't enough information to answer.
10 amps
24 amps
8: What is specific heat?
measured heat
heat required to raise the temperature of 1lb of a substance 1 degree
the specific heat required to change the state of one cubic foot of air to steam
none of the above
9: Heat transferred by conduction from one body to another is done
via liquids
via radiation
via heat rays
via solids
10: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
Class M machinery room
Class B machinery room
Class A machinery room
Class T machinery room
11: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
District Engineering Inspectors
Commissioned Inspectors
Master licensed Technician
both a or b
12: one BTU equals
3.41 hp
Pi
12,000 hp
31.4 hp
13: Pressure is equivalent of
Force
Force / Area
Area X Force
Force X Area
14: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
True
False
15: Fusible plugs shall not be used with pressure vessels of
15 square feet or less
3 cubic feet or less
3 cubic feet or more
15 cubic feet or more
16: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
motor starter
printed circuit board (PCB)
centrifugal switch
duel-voltage switch
17: Ammonia belongs to Group
A-1
B-2
B-1
A-2
18: The location of a thermal bulb of a TXV affects
the amount of liquid refrigerant in the evaporator
the amount of liquid returning to the compressor
subcooling
the amount of liquid in the condenser.
19: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
20: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
66
50
25
22
21: The critical temperature of a refrigerant gas occurs when
any increase in pressure will not liquefy the gas
any decrease in pressure will cause condensation
the gas is no longer saturated
the gas returns to a liquid
22: A Category D fluid
is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
is when the design pressure does not exceed 150 psi
a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
Both a and b are correct
23: E = I X R is
Watts Law
Amps Law
Impedance Law
Ohms Law
24: What must be done to refrigerant pipes before being buried?