Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
5KW
746 watts
1000 watts
600 watts
2: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
350
100
250
400
3: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
4: Ammonia (NH3) is a group III refrigerant
True
False
5: A VRF system is a direct system
true
false
6: Start to Run windings will have what resistance?
All will be at equal values
The least resistance value
The most resistance value
Somewhere between the actual start winding and run winding resistance value
7: The proper location for an oil separator is between the
receiver and metering device
condenser and receiver
evaporator and compressor
compressor and condenser
8: Fractionation occurs when
when a fraction of refrigerant is added as the full charge
some of the blended refrigerant evaporates or condenses before the rest of the blend
the pressures decreases as the heat load decreases
the pressures increase as the heat load increases
9: R-11 belongs to Group
B-1
A-1
B-3
A-2
10: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
24
36
48
18
11: Relief valves are rated in
gallons of water per hour
gallons of water per minute
pounds of air per hour
pounds of air per minute
12: The main cause of enacting the "no vending rule" of July 1st 1992 was
global warming potential
ozone depletion
both a & b
None of the above
13: If the power element on an expansion valve should lose its charge, the valve would
Stay open
Close
Over feed
Under feed
14: To determine the pump size needed for an open cooling tower system, the following must be known,
GPM and balanced head and friction head
GPM and friction head
GPM and unbalanced head and friction head
GPM, pipe size, and equivalent head.
15: A rule of thumb in air conditioning is ____ CFM per ton?
100
600
500
400
16: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
116
108
88
38
17: Ammonia belongs to Group
A-2
B-2
B-1
A-1
18: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
365 psig, 120 psig
257 psig, 77 psig
455 psig, 185 psig.
226 psig, 68 psig
19: If your suction line is warmer than the room temperature, this may indicate
below normal superheat
an over charge
a low charge
plugged air filter
20: The equivalent length of pipe in a water piping system is
the total length of pipe plus equivalent of fittings multiplied by 2.31
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 as you would measure it plus 25% for fittigns
21: When air is ducted through a machine room that services occupied space, What must be done?
Ducted and sealed
Flanged and gasketed
Welded and seamed.
Insulated and cross broke
22: 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.
23: How much clearance do you need around the perimeter of electrical panels?
24"
36"
18"
12"
24: Three-phase motors have what type of windings?
three run windings and 3 start windings
three run windings
one start winding and one run winding.
three start windings
25: High pressure controls should be set no higher than