Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What is the leaving chilled water set point for water chiller systems?
55F
66F
38F
45F
2: Machinery rooms must be vented to ______?
basement
outdoors
unoccupied spaces
neutralizing tank
3: What is not a requirement of a class T machine room?
fire hose connection to the building fire protection system
automatic ventilation
self-closing doors
tight fitting doors
4: A relief valve shall be located at least ___ above grade.
15'
36'
25'
10'
5: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
R-718
trichlorotrifluoromethane
methyl chloride
ammonia
6: Which refrigerant replaced R-12?
R-134A
R-407A
R-410A
R-22
7: The two basic types of evaporators are
prime surface and finned
direct expansion and plate
flooded and direct expansion
finned and plate
8: Give an example of a secondary coolant?
R-717
R-410A
R-718
R-12
9: "R" represents ___ in the Ohm's law formula
voltage
resistance
amperage
capacitance
10: What is the amp draw of a 40 VA transformer at 24 volts
1.6 amps
106 amps
1,000 amps
1K amps
11: 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
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
660 lbs
330 lbs.
550 lbs
55 lbs
13: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
over pressure protection
over pressure protection and a rupture disc
Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
over pressure protection as well as a temperature protection device
14: What type of refrigerants are NOT flammable?
CHC
HFC
HCFC
All of the above
15: In a horizontal shell & tube condenser, the ammonia is liquefied by
passing thru the tubes from top to bottom
removing the latent heat of fusion
water sprayed over condenser
removing the latent heat of vaporization
16: What type of voltage cause a potential relay to open?
24 volt supply from the thermostat
120 volt line voltage
Pick-up voltage
none of the above
17: The outer portion of shell of the compressor used on low-pressure chillers is called the
nozzle
volute
suction
baffle
18: 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.
80
90
100
110
19: When energized, a normally open relay will be
depends on the type and class of the relay
open
closed
noisy
20: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
institutional occupancy
commercial occupancy
mixed occupancy
public assembly occupancy
21: What chemical in the refrigerant set off the leak detection alarm?
Fluorine
Chlorine
Both A and B
none of the above
22: Where would the EPR valve be located on a multiple evaporator system?
outlet of low temperature evaporator
outlet of the liquid line
inlet of the low temperature evaporator.
outlet of high temperature evaporator
23: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
3
2
5
1
24: What is potential measured in?
Henrys
Amps
Ohms
Volts
25: What are the three components of a transformer?
Contacts, secondary coil, and core
Primary core, secondary coil, and high and low voltage connectors.