Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Ammonia can come in contact with _______ ?
Brass
Copper tubing
Aluminum
Copper
2: A High-Probablity system
is a system highly likely to leak from a failed connection or component of such system
is such that any leak will cause injury or death to anyone within a 100 square foot area
is such that a leak of refrigerant from failed connections will enter the unoccupied space
is such that a leak of refrigerant from failed connections will enter the occupied space
3: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
gas masks must be worn
the owner shall be informed
explosion precautions must be taken
no flames shall be permitted
4: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
Rotating vanes
Nesting scrolls
Fan-like action
Suction and discharge valves
5: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, paper method, and frost line.
sight glass, weight, pressure, and frost line
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
6: In designing duct work, pressure and ______ need to be considered
length
CFM
duct sealant used
all of the above
7: 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.
8: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
annually
bi-annually
quarterly
regularly
9: On a large centrifugal system, what meters the flow to the evaporator?
Cap tube.
TXV
High side float
Low side float
10: Which winding have the most turns?
run
depends on the motor phase
they have equal amount of turns
Start
11: What would be the classification of a church?
Industrial
Place of assembly
Large mercantile
Institutional
12: When a refrigeration or air conditioning system is installed
a field inspection shall be made before it is put into service
it shall be approved by the owner for proper operation.
it shall not be operated below prescribed pressures
the form of certificate shall be authorized by the Department of Pubic safety
13: How many opening forces operate a thermostatic expansion valve?
3
1
4
2
14: Which refrigerant is lighter than air?
R-11
R-717
R-134a
R-123
15: Name a reason that does not cause reduced condenser air quantity
Dirty fan blades
High ambient temperature
Prevailing winds
Dirty Coil
16: Which of the following is NOT a positive displacement compressor?
screw
scroll
centrifugal
reciprocating
17: Pi equals approximately
3.14
12,000
3.41
746
18: Halogen refrigerants are corrosive to which type of metal?
stainless steel
copper
black iron
magnesium
19: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
shall be prohibited
of Group B2 refrigerant shall be prohibited
shall not be prohibited
containing R-11, R-123 & R-717 exclusively shall not be prohibited
20: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
88
108
116
38
21: 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
22: When air is ducted through a machine room that services occupied space, What must be done?
Insulated and cross broke
Welded and seamed.
Flanged and gasketed
Ducted and sealed
23: The equivalent length of pipe in a water piping system is
the total length of pipe plus equivalent-length of fittings
the total length of pipe as you would measure it
the total length of pipe plus equivalent of fittings multiplied by 2.31
the total length of pipe as you would measure it plus 25% for fittigns
24: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
Rust can form
The Li-Br solution will become more concentrated
System operating pressure will drop
The Li-Br solution will become more diluted
25: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.