Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: "I" represents ____ in the Ohm's law formula.
voltage.
resistance
amperage
capacitance
2: Pipe identification labels are required when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
3: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“UM” and “UV”
“U” or “UM”
“UV”
“UL”
4: A device used to measure small pressure differences is the
manometer
phsycometirc
anemometer
pyrometer
5: At higher altitudes, the boiling point of refrigerant is
the same
equal to the coefficient of water at 32F
lower
higher
6: 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
7: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
When there is a space 6' or more above it
When there are sprinklers above
When its white
When it's used as part of a supply or return air system
8: The color code of a tank of ammonia is
lavender
silver
white
light green
9: Capacitors are rated in
volt - amperes
megaohms
micro-farads
kelvins
10: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
low side of the system
the liquid side of the system
the vapor side of the system
high side of the system
11: What device measures the specific gravity of a substance?
Hygrometer
Thermometer
Hydrometer
Manometer
12: Heat transferred by conduction from one body to another is done
via radiation
via liquids
via solids
via heat rays
13: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
3/8"
1/2"
3/4"
5/8"
14: Which refrigerant class listed below is the most flammable?
C-3
A-1
B-2
A-3
15: On cooling towers, what causes the condenser water to drop
ambient temperatures
tower fans
sensible heat
evaporation of the water droplets
16: Heat transferred by conduction from one body to another is done via:
gas
liquid
solid
All of the above
17: What is not a requirement of a class T machine room?
fire hose connection to the building fire protection system
self-closing doors
tight fitting doors
automatic ventilation
18: R-410A is classified as a ____ refrigerant on the safety matrix.
A-1
B-1
B-2
A-2
19: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
phosgene gas sening
A group sensing
CO Sensing
refrigerant sensing
20: The 522 CMR 9.00 has adopted for reference ASHRAE ____
10
III
25
15
21: Booster compressors connect to the ____ side of the compressor
low side
oil side
vapor
liquid
22: A class A3 refrigerant is considered
toxic and non-flammable
non-toxic and non-flammable
toxic and somewhat flammable
non-toxic but highly flammable
23: What is R-22?
CCFCM
HFC
Chlorodifluoromethane
Chlorofluoromethane
24: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
shall be inspected by the Boiler of Inspectors bi-annually
shall have a pressure limiting device installed on the high side of the system
does not require a pressure-limiting device
shall have a pressure limiting device and a pressure relief valve installed
25: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to