Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Two systems using separate refrigerants that are superimposed upon one another is called
cascade
booster
indirect
single stage
2: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
boost voltage
run voltage
lift voltage
pick up voltage
3: The principle used in continuous type absorption systems is
Ohm's Law
Charles's Law
Dalton's Law
Boyle's Law
4: What is the purpose of a surge capacitor on a contactor?
to balance the sine waves
to keep the contactor pulled in
to provide smoother start/stops
to protect low voltage equipment
5: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
True
False
6: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
Electricity
Oil
Heat
Air
7: Which oil is hydoscopic?
animal
SW30
polyolester
mineral
8: The low pressure oil safety switch
must be reset manually
never trips
resets itself automatically
resets itself after the time delay has terminated
9: What is the minimum size wire you can use on a 30 amp circuit?
12 AWG
16 AWG
14 AWG
10 AWG
10: R-123 belongs to Group
B-3
A-3
B-2
B-1
11: What instrument is used to measure very high resistance?
meg ohmmeter
voltmeter
ammeter
tape measure
12: Ammonia belongs to Group
A-1
B-1
B-2
A-2
13: "I" represents ____ in the Ohm's law formula.
capacitance
resistance
amperage
voltage.
14: The most common type of motor starter is
delts-wye starter
across the line starter
duel-winding starter
part winding starter
15: Copper and its alloys shall not be used with ammonia
True
False
16: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, pressure, and dipstick
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and frost line
sight glass, weight, paper method, and frost line.
17: A Low-Probability System
is such that a leak of refrigerant from a failed connection will enter the occupied space
is such that a leak of refrigerant from a failed connection can not enter the occupied space
is a system highly likely to leak form 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
18: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
liquid line that is too small
shortage of refrigerant
liquid line that had too high vertical lift
All of the above
19: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
30 days
2 months
14 days
1 week
20: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
mercantile occupancy
business occupancy
commercial occupancy
public assembly occupancy.
21: Transformers are rated in
volts-ohms
amps
volts
volt-amps
22: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
a ling psychrometer doesn't have two theremometers.
2F difference
nearly the same
far apart or greater difference
23: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
255 psig
365 psig
125 psig
327 psig
24: 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
25: Direct systems using Group II refrigerants
shall be installed per instruction of the AHJ
shall be allowed to be used for human comfort.
shall be installed in Class T machinery rooms
shall not be used for air condition for human comfort