Exam (elaborations)
Electrical Questions and Answers 2024
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Exam of 16 pages for the course Enphase at Enphase (Electrical)
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ElectricalTechnician A says that a soldering gun must be energized for several minutes before it
warms up to the melting point of solder. Technician B says that a soldering torch is
heated by burning butane gas. Who is right? - answerB only
Which of the following is used to remove melted solder from an existing joint? - answer
Desoldering bulb
What does the term high impedance mean when applied to multimeters? - answerLow
current flow
Oscilloscopes are being discussed. Technician A says that an oscilloscope measures
changes in voltage. Technician B says that an oscilloscope measures changes in
speed. Who is right? - answerA only.
Timing lights are used to synchronize the operation of the engine ____. -
answercompression and ignition systems
The exhaust gas analyzer is installed in the vehicle tailpipe to measure which of the
following exhaust gas components? - answerChemical content
Computer memory retaining tools are being discussed. Technician A says that a small
battery is sufficient to maintain computer memory. Technician B says that the computer
memory retaining tool should be installed as soon as the battery is removed. Who is
right? - answerA only.
Technician A says that a battery tester can check the operation of the charging system.
Technician B says that a load tester can check the operation of the starting system.
Who is right? - answerB only.
Which of the following electrical sources is least likely to shock the technician? -
answerVehicle battery voltage
Technician A says that a blown fuse can be replaced with one with an amp rating no
more than 5 amps higher. Technician B says that a replacement wire should be the
same gage as the one being replaced. Who is right? - answerB only.
A shop fire approaches drums of flammable liquids, such as gasoline or cleaning fluid.
What should the technician do immediately? - answerLeave the shop.
,Batteries can explode because they give off what gas? - answerHydrogen
Which of the following fire extinguishers could be used to put out a gasoline fire? -
answerCarbon dioxide
Shop safety is being discussed. Technician A says that one way to prevent accidents is
to avoid people who are careless. Technician B says that one way to prevent accidents
is to keep the shop organized. Who is right? - answerBoth A and B.
A respirator is a type of ____ protection. - answerlung
Which of the following is not an electronic device? - answerSolenoid
Electronic devices usually operate using which of the following voltages? - answer6
volts or less
A sensor converts a condition such as pressure or flow into ____. - answerelectricity
Technician A says that modern voltage regulators control charging system voltage to
between 13 and 15 volts. Technician B says that voltage regulators on modern vehicles
are mounted at a cool spot on the engine firewall. Who is right? - answerA only.
The engine crankshaft turns the alternator rotor, usually through ____. - answera belt
and pulleys at the front of the engine
Technician A says that injector pulse width is an indication of how long the injector is
energized. Technician B says that injector pulse width is an indication of injection pump
fuel delivery. Who is right? - answerA only
In addition to seat belts, all of the following are supplemental restraint system
components, except: - answerMaster cylinder.
Technician A says that fuel injection is more efficient than carburetors in controlling air-
fuel ratio. Technician B says that a fuel-injected engine will produce more emissions
than a carbureted engine. Who is right? - answerA only.
Technician A says that all electrical problems are caused by something that decreases
current flow in a circuit. Technician B says that all electrical problems are caused by
something that decreases voltage in a circuit. Who is right? - answerA only.
Which of the following is not a way to systematically approach a problem? -
answerReplace the simplest or cheapest component first, then recheck.
A technician determines that none of the components in a particular circuit are working.
What should the technician do next? - answerBegin testing at the power source for the
circuit
, Technician A says that high circuit resistance could make a motor turn slowly and
overheat. Technician B says that high circuit resistance could make a bulb burn too
brightly and overheat. Who is right? - answerA only.
A circuit is shorted to ground between the circuit loads and the normal ground
connection. What will happen? - answerNothing will happen
A series circuit is shorted to ground between two lightbulbs in the circuit. What will
happen? - answerThe first lightbulb will light, but the second will stay off.
A loose connector could cause all of the following problems, except: - answerBlown
fuses.
Electrons have a(n) ____ charge. - answernegative
The building block for all matter is the ____. - answeratom
Which of the following is not a good insulator? - answerIron
Copper is a good conductor of electricity because two of its ____ are loosely attached to
their atom. - answerelectrons
Magnetism has an effect on materials containing which of the following? - answerIron
Current can be created in a wire by passing it through ____. - answera magnetic field
Which of the following is a measure of electrical pressure? - answerVoltage
Current flow is measured in which of the following units? - answerAmperes
One bulb in a series circuit of six bulbs burns out. What happens to the other bulbs in
the circuit? - answerThey will not light up.
What does a frame-ground circuit use as a return wire? - answerThe vehicle body or
frame
Technician A says in a series circuit, only some of the current flows through parts of the
circuit. Technician B says a series-parallel circuit is a combination of series and parallel
sections. Who is right? - answerB only.
Conventional and electronic current flow are being discussed. Technician A says that
conventional current flow is still used when discussing automotive electricity. Technician
B says conventional current flow is the correct way to describe electron flow. Who is
right? - answerA only.
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