Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Joints in refrigeration piping must be _____ before being covered?
Leak tested
Insulated
Inspected
Pressurized
2: Ohm's Law indicates Amps X Resistance = ___________.
Current
Ohms
Impedance
Volts
3: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
Stop valve
Muffler
Foot valve
Moisture indicator
4: Which refrigerant(s) is an HFC?
R-22
R-410A
R-502
All of the above
5: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
240 volts
24.0 volts
2.40 volts
2,400 volts
6: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
20
15
25
10
7: What would be the classification of a prison?
Industrial
Institutional
Large mercantile
Place of assembly
8: Halo-carbon refrigerants cannot be used with what material?
Aluminum
Magnesium alloy
Copper
Stainless Steel
9: 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
10: The low pressure oil safety switch
resets itself after the time delay has terminated
resets itself automatically
must be reset manually
never trips
11: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
2.5
5.5
3.0
2.0
12: The Board of Boilers adopts by reference
the MACS Pressure Vessel Code of Massachusetts
the 1997 ANSI/ASHRAE Safety Code
MSCA Code
Montreal Protocol Safety Code
13: If a condenser is on a roof and the temperature is 35F and dropping the capacity
run as designed with low ambient controls
doesn't change
decreases
increases
14: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
240v
277v
120v
208v
15: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
10 amps
20 amps
5 amps
15 amps
16: A low oil switch is typically
time-delay auto reset
non used on semi-hermetic compressors over 10 ton capacity
manual reset
automatic reset
17: Clearance volume
is the same on all compressors
has no effect on compressor capacity
affects compressor capacity
varies depending on compressor speed
18: A single pole-double throw switch used how many wires excluding the ground wire?
four
five
three
two
19: Institutional occupancy is
a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
None of the above
20: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
Specific heat
Latent heat
Enthalpy
Sensible heat
21: Give an example of a secondary coolant?
R-717
R-410A
R-718
R-12
22: Which of the following types of oils are hygroscopic?
polyolester (POE)
polyalkylene glycol (PAG)
naphthene mineral
both a and b
23: A start capacitor is wired in _____ with the start windings.
junction
series-parallel
series
parallel
24: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
shall have a pressure limiting device and a pressure relief valve installed
does not require a pressure-limiting device
shall be inspected by the Boiler of Inspectors bi-annually
shall have a pressure limiting device installed on the high side of the system
25: What is an example of institutional occupancy?