Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Which has more turns in the windings: Start windings or Run windings?
Start windings
Run windings
They both have the exact same turns
Depends on the system and capacitor used
2: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
104 ohms
71 ohms
27 ohms
80 ohms
3: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, pressure, and frost line
sight glass, weight, paper method, and frost line.
sight glass, weight, pressure, and dipstick
Buss-eye, weight, pressure, and frost line
4: A rule of thumb in air conditioning is ____ CFM per ton?
100
600
500
400
5: If a condenser is on a roof and the temperature is 35F and dropping the capacity
run as designed with low ambient controls
increases
doesn't change
decreases
6: Heat transferred by conduction from one body to another is done
via liquids
via solids
via radiation
via heat rays
7: A direct system
is a self-contained complete factory made and tested system
is one which encloses a separate body of evaporative refrigerant
is where the refrigerant comes in contact with the space refrigerated
is on where brine is cooled & circulated to the space refrigerated
8: 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
9: What must be done to all doors and access points in duct work going through a mechanical room?
Must be hindged
Must be screwed shut
Must be sealed and gasketed
All of the above
10: High pressure controls should be set no higher than
25% of set point
90% of set point
80% of set point
10% of set point
11: Whoever owns/uses a refrigeration or air conditioning system covered by this code
must notify the Department of Public Safety prior to starting the system
shall be licensed by the Commonwealth of Massachusetts according to CMR 522
shall make application for inspections to the Chief of Inspectors
None of the above
12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
concentrated solution
absorbed solution
weak solution
strong solution
13: Where are the three places that the discharge from an ammonia relief valve be piped?
To chemical neutralizing tank only
Underground, into drain, into mechanical room
Atmosphere, Tank containing water, where the AHJ indicates.
None of the above.
14: What is the refrigerant chlorodifluoromethane?
R-22
R-134a
R-12
R-123
15: What type of fuses must be used on a HVAC system?
TR Type, Duel Element, Time Delay
Fast blow
10% lower than RLA
none of the above
16: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
far apart or greater difference
nearly the same
2F difference
a ling psychrometer doesn't have two theremometers.
17: What is a Category "D" fluid?
A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
A typical refrigerant used on newer air conditioning and heat pump ssytems
Any fluid that exceeds 150 psig and has design temperature of over 366F
A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
18: Who approves containers for refrigerants?
D.O.T
D.O.D
D.O.E
E.P.A
19: The evaporator is a device to
store liquid refrigerant
remove heat from the refrigeration system
absorb heat into the refrigeration system
Keep the compressor busy
20: While water is evaporated in an evaporative condenser the impurities which were in the water are
washed out of the air by the spray pump
accumulate in the sump water
remain in the air
blown to the atmosphere by the fan
21: 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 high side
2.5 times the design pressure
the aggregate of the high side and low side
the low side
22: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
Flush with ammonia
Flush with R-718
Flush with RX-11
Flush with R-11
23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
A group sensing
refrigerant sensing
CO Sensing
phosgene gas sening
24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
660 lbs
55 lbs
550 lbs
330 lbs.
25: "I" represents _______ in the Watt's law formula.