Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A split-phase motor has a ______ winding and a ____ winding
start, common
run, common
duel-run, duel-start
run, start
2: A EPR valve is installed on what type of evaporators?
shell and tube evaporators
high-temperature evaporators
low-temperature evaporators
plate evaporators
3: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
ball valves
king valves
companion or block valves
gate or globe valves
4: Absolute pressure is
Gauge Pressure
Atmospheric Pressure
Gauge + Atmospheric Pressure + Pi
none of the above
5: Stop valves shall not be permitted between the system and the
condenser
relief valve
bleed valve
service valve
6: A 24 volt transformer with a 240 volt primary can handle how many amps?
20 amps
There isn't enough information to answer.
10 amps
24 amps
7: A restaurant is classified as a
public assembly occupancy
commercial occupancy
mixed occupancy
large mercantile occupancy
8: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
100
110
80
90
9: Start to Run windings will have what resistance?
The most resistance value
Somewhere between the actual start winding and run winding resistance value
All will be at equal values
The least resistance value
10: 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
11: 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 R-11
Flush with RX-11
12: The instrument used to measure the specific gravity of absorption chiller solutions is the
Psychrometer
refractometer
hydrometer
anemometer
13: What must be done to refrigerant pipes before being buried ?(8.10.4)
Classifed
Insulated and installed in a pipe duct (Encased)
Leak checked
Certified
14: Ammonia is under what safety classification?
B1
B2
B3
A3
15: What type of oil is used in R-410A systems?
mineral oil
polyalkylene glycol (PAG)
naphthene
polyolester (POE)
16: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
257 psig, 77 psig
226 psig, 68 psig
350 psig, 120 psig
455 psig, 185 psig
17: The normal operating evaporator temperature of R-410A for air conditioning is typically
32F
45F
158F
155F
18: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
330 lbs.
550 lbs
660 lbs
55 lbs
19: Ammonia (NH3) is a group III refrigerant
True
False
20: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
When it's cold out
When there is a malfunction on the high side
When its warm out
All of the above
21: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
22: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
9.00'
8'4"
7.25'
7.00'
23: What happens to copper joints when overheated?
nothing
joint becomes oxidized and ditorted
copper becomes harder
none of the above
24: "P" represents ______ in the Watt's law formula
voltage
amperage
reactance
watts
25: Who is permitted to access a refrigeration machine room?