AMT: General Oral & Practical Exam Guide Questions and Answers 100% Solved

AMT: General Oral & Practical Exam

Guide Questions and Answers 100%

Solved


What constitutes a capacitor? - ✔✔Two conductors separated by an

insulator.


What is the purpose of a capacitor? - ✔✔It stores electrical energy in

electrostatic fields.

Does a capacitor in an AC circuit cause the current to lead or lag the

voltage? - ✔✔It causes the current to lead the voltage.


What is the basic unit of capacitance? - ✔✔The ferad.


Why should electrolytic capacitors not be used in an AC circuit? - ✔✔They

are polarized. An electrolytic capacitor will pass current of one polarity, but

will block current of the opposite polarity.


What is meant by inductance? - ✔✔The ability to store electrical energy in

electromagnetic fields.
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,What is the basic unit of inductance? - ✔✔The henry.


What is an example of an inductor used in a magneto? - ✔✔The coil.


Does an inductor in an AC circuit cause the current to lead or lag the

voltage? - ✔✔It causes the current to lag behind the voltage.


How can you find the polarity of an electromagnet? - ✔✔Hold the

electromagnet in your left hand with your fingers encircling the coil in the

direction electrons flow (from negative to positive). Your thumb will point to

the north pole of the electromagnet.


What is meant by impedance? - ✔✔The total opposition to the flow of

alternating current. It is the vector sum of resistance capacitive reactance,

and inductive reactance.


In what units is impedance measured? - ✔✔In ohms.


What are five sources of electrical energy? - ✔✔Magnetism, chemical

energy, light, heat, and pressure.


What is the basic unit of power in a DC circuit? - ✔✔The watt.


What is meant by a kilowatt? - ✔✔1,000 watts.



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,What is meant by a megawatt? - ✔✔1,000,000 watts.


What is the formula for power in a DC circuit? - ✔✔Power = Voltage times

current (P = E x I)


What is the relationship between mechanical and electrical power? - ✔✔1

horsepower = 746 watts


What is meant by true power in an AC circuit? - ✔✔The product of the

circuit voltage and the current that is in phase with this voltage.


In what units is true power expressed? - ✔✔In watts.


What is meant by apparent power in an AC circuit? - ✔✔The product of the

circuit voltage and the circuit current.


In what units is apparent power expressed? - ✔✔In volt-amps.


What is meant by the reactive power in an AC circuit? - ✔✔The power

consumed in the inductive and capacitive reactances in an AC circuit.

Reactive power is also called wattless power.


In what units is reactive power expressed? - ✔✔In volt-amps reactive

(VAR), or kilovolt-amps reactive (KVAR).



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, What is meant by power factor in an AC circuit? - ✔✔The ratio of true

power to apparent power. It is also the ratio of circuit resistance to circuit

impedance.

Which law of electricity is the most important for an aircraft mechanic to

know? - ✔✔Ohm's law.


What are the elements of Ohm's law? - ✔✔Voltage E, current I, and

resistance R (volts, amps, and ohms).


What is voltage? - ✔✔Electrical pressure.


What is the basic unit of voltage? - ✔✔The volt.


What instrument is used to measure voltage? - ✔✔A voltmeter.


To measure voltage, is a voltmeter placed in series or in parallel with the

source of voltage? - ✔✔In parallel.


What is electrical current? - ✔✔The flow of electrons in a circuit.


What is the basic unit of current flow? - ✔✔The ampere (amp).


What part of an amp is a milliamp? - ✔✔One thousandth (0.001) of an

amp.


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