Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What type of refrigerants are NOT flammable?
CHC
HFC
HCFC
All of the above
2: How many gallons of water do you need per pound of ammonia?
50
10
1
100
3: The 522 CMR 9.00 has adopted for reference ASHRAE ____
III
15
10
25
4: Refrigerants shall be classified by
color codes
maximum permissible quantities of each group
requirements for commercial, industrial, and residential occupancies
toxicity and flammability
5: RPM's of a centrifugal compressor are at approximately?
500
10,000
15,000
30,000
6: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
50
22
33
18
7: Which of the following is a drop-in for R-22
R-410A
R-134A
R407C
None of the above
8: What must be done if refrigeration lines pass through a concrete floor?
installed through a pipe casing
leak checked
insulated
moisture barrier
9: "I" represents _______ in the Watt's law formula.
watts
voltage
amperage
reactance
10: What type of relief valve is used on a CO2 system?
fusible plug
rupture disc
glove disc
gate valve
11: E = I X R is
Watts Law
Amps Law
Impedance Law
Ohms Law
12: Megaohm meters can detect a ground in the
up to 1,000 ohms
up to 10,000 ohms
10,000,000 ohms or higher
up to 1,000,000 ohms
13: How many refrigerant classifications are there for flammability?
1
3
7
2
14: What is the purpose of suction/discharge traps?
to ensure proper oil return to the compressor
to keep oil inside the evaporator for proper oil return to the compressor
to keep oil inside of the accumulator for proper return to the compressor
all of the above
15: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
the low side
the aggregate of the high side and low side
2.5 times the design pressure
the high side
16: The leaving chilled water set point for comfort cooling is typically?
60
66
45
38
17: Most CFC's are
toxic
inert but toxic
flammable
inert
18: Which of the following is not an air velocity meter?
Anemometer
Hydrometer
Anemotherm
Velometer
19: _____ alloys shall not be used in contact with an halogenated refrigerants.
Nickel
Copper
Zinc
Magnesium
20: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
2.5, 2.5
2.5, 3.0
6.6, 6.6
3.0, 3.5
21: Setting a pressure relief device shall not exceed ___ of the design pressure
100%
75%
80%
90%
22: Fusible plugs shall not be used with pressure vessels of
3 cubic feet or less
15 cubic feet or more
15 square feet or less
3 cubic feet or more
23: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
it would cause the condenser to sweat
it would make the condenser less efficient
it would make the condenser more efficient
it would have no effect on the condenser
24: The oil separator is always inserted in the system
in the discharge line
in a cool spot
where it can be easily serviced
to prevent oil logging
25: 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)