Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A device used to measure small pressure differences is the
anemometer
phsycometirc
pyrometer
manometer
2: Doors communicating with outside from a mechanical room must be?
Steel, approved, weather-stripped
Self-closing, approved, fire door
Self-closing, aligned, fire door
Self-closing, wooden, fire door
3: One atmosphere equals
0 psig
14.7
29.4
0 psia
4: Class 3 refrigerants are
non-flammable
highly flammable
toxic
non-toxic
5: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
75
50
15
55
6: What measures gas pressure?
Manometer
Barometer
Hygrometer
Hydrometer
7: Where must a refrigeration contractor's license number be displayed?
Trucks, invoices, and advertising
Uniforms, checks, and invoices.
Trucks, license plates, and uniforms
Truck, office, every job, and on all equipment
8: How many different groups of refrigerants are there?
3
11
7
15
9: Three-phase motors have what type of windings?
three run windings
one start winding and one run winding.
three start windings
three run windings and 3 start windings
10: 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
10 amps
5 amps
11: R-410A can segregate in the system or chemically change its composition due to a leak.
True
False
12: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
Pressure gauge
Temperature gauge
Sight glass gauge
All of the above
13: The leaving chilled water set point for comfort cooling is typically?
60
38
45
66
14: By using nitrogen within a pipe during brazing operation,
The explosion hazard is confined
Discoloration is prevented
Exterior scale formation is minimized
Copper oxide formation is prevented
15: How many forces operate a thermostatic expansion valve?
2
3
1
4
16: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
checking the level of refrigerant in the system
testing for oil in the system
testing for moisture in the system
none of the above
17: No open flames are allowed in the machinery room unless?
Approved by the installing contractor
Approved by the authorized person
Never can be allowed
Only when combustion air is provided from outside of the machinery room
18: 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
19: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
80%
99%
90%
75%
20: Which refrigerant class listed below is the most flammable?
B2
A3
A2
C3
21: "I" represents ____ in the Ohm's law formula.
amperage
voltage.
resistance
capacitance
22: Refrigerants shall be classified by
toxicity and flammability
maximum permissible quantities of each group
color codes
requirements for commercial, industrial, and residential occupancies
23: Which oil is hydoscopic?
SW30
animal
mineral
polyolester
24: The high side float assembly meters refrigerant into the evaporator through the
lower chamber of the low side
upper chamber of the low side
lower chamber of the high side
upper chamber of the high side
25: Capacity control on a centrifugal compressor is accomplished by the