Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What would be the classification for Stop & Shop grocery store?
Industrial
Instituional
Place of assembly
Large mercantile
2: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
commercial occupancy
illegal occupancy
public assembly occupancy
institutional occupancy
3: A split-phase motor has a ______ winding and a ____ winding
run, common
duel-run, duel-start
start, common
run, start
4: A low oil switch is typically
automatic reset
manual reset
time-delay auto reset
non used on semi-hermetic compressors over 10 ton capacity
5: Which of the following controllers would you expect to be most sensitive to temperature changes?
low voltage t-stat
aquastat
immersion controller
line voltage t-stat
6: The formula for Pure Power in a resistance circuit is
Kw = volts X amps
Watts X amps.
Watts X power factor
Watts = volts X amps
7: How are refrigerant blends classified?
Blends don't have to be classified
Based on the oil used
Based on worst case fractionation
Based on best case Fractionation
8: On a single phase motor, when does the start winding cut out?
75% of its RLA speed
50% of its RLA speed
100% of its RLA speed
25% of its RLA speed
9: Increasing superheat will do what to your frost line?
Decrease
Increasae
Could either increase or decrease depending on the load conditions
Nothing
10: A professional or office building would be considered what type of occupancy?
public assembly
business
commercial
mercantile
11: What is potential measured in?
Volts
Amps
Ohms
Henrys
12: A start capacitor is wired in _____ with the start windings.
series-parallel
junction
parallel
series
13: Class T machine room
shall include closets used for setting equipment
has no flame producing apparatus permanently installed
shall have remote controls to stop the action of the refrigerant compressor
shall have refrigerant leak detecting systems installed inside and outside the room
14: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
100
24
50
75
15: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
1.2
2.2
1
1.5
16: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
fusible plug
relief valve
rupture disc
all of the above
17: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
bi-annually
regularly
quarterly
annually
18: The best way to detect ammonia in brine is
carbonation of soda
CO2 gas
potassium of line
nessler regaent
19: What will occur if the strong solution in an absorption chiller becomes too strong?
The machine will cool excessively as the solution crystallizes.
The machine will stop cooling and the solution will evaporate.
The machine will stop cooling and solution will crystallize
The machine will cool excessively as the solution evaporates
20: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
20 amps
15 amps
5 amps
10 amps
21: Low pressure chiller systems use what type of compressor?
Screw
Reciprocating
Scroll
Centrifugal
22: The rupture disc on a low-pressure chiller typically releases pressure at
15 psig
5 psig
0 psig
10 psig
23: Adjusting the spring pressure on a TXV
changes superheat
adjusts the bulb charge
changes subcooling
makes no difference
24: A EPR valve is installed on what type of evaporators?
high-temperature evaporators
shell and tube evaporators
low-temperature evaporators
plate evaporators
25: Capacity control on an absorption system is typically accomplished by varying the