Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
the ASME Boiler and Pressure Vessel Code
Section 11.3.1.5 ASHRAE 15 Standard
the ANSI Standard 10.7.2
both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
2: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
low head pressure
not enough oil in the system
moisture in the system
oil in evaporator
3: "E" references ____ in the Ohm's law formula
amperage
capacitance
voltage
resistance
4: What's the purpose of a megohmmeter?
To measure low to very low resistance values
To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
To measure very high resistances
None of the above
5: 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
6: Class T machine room
has no flame producing apparatus permanently installed
shall include closets used for setting equipment
shall have refrigerant leak detecting systems installed inside and outside the room
shall have remote controls to stop the action of the refrigerant compressor
7: How many different groups of refrigerants are there?
3
11
15
7
8: Ammonia belongs to Group
A-1
A-2
B-1
B-2
9: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
reset the expansion valve
start the comrpessor
reset the safety valve
start the fan and circulating pump
10: A normal operating evaporator temperature of R-22 for air conditioning is typically
58F
55F
45F
32F
11: What was the main reason for enacting the no venting rule of July 1, 1992?
Ozone depletion
Green house effect
Global warming potential
All of the above
12: The main purpose of the accumulator is to
store liquid refrigerant
prevent liquid slugs at the compressor
provide space for the accumulation of oil and containminants
provide space for vapor to accumulate
13: Where are the three places that the discharge from an ammonia relief valve be piped?
atmosphere, tank containing water, where the A.H.J. indicates
underground, into drain, into mechanical room
to chemical neutralizing tank only
none of the above
14: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
R-113
R-12
R-11
R-22
15: What refrigerant doesn't have to be classifted?
R-134a
R-718
R-717
R-711
16: A mixed occupancy occurs when two or more occupancies are located with the same building
true
false
17: 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
18: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
public assembly occupancy
illegal occupancy
institutional occupancy
commercial occupancy
19: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
True
False
20: Ohm's Law indicates Amps X Resistance = ___________.
Volts
Current
Impedance
Ohms
21: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
trichlorotrifluoromethane
R-718
ammonia
methyl chloride
22: Megaohm meters can detect a ground in the
up to 10,000 ohms
up to 1,000 ohms
up to 1,000,000 ohms
10,000,000 ohms or higher
23: Heat is a form of
work
matter
power
energy
24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed