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General oral questions > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the basic unit of current?

A

The amp

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2
Q

What is the basic unit of resistance?

A

The ohm

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3
Q

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

A

Ohm’s law

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4
Q

What are the three elements in Ohm’s law?

A

Voltage, current, and resistance (volts, amps, and ohms).

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5
Q

What are five sources of electrical energy?

A

Magnetism,chemical energy, light, heat and pressure

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6
Q

What four things affect the resistance of an electrical conductor?

A

The material, the cross-sectional area, the length and the temperature.

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7
Q

How can you tell the resistance of a composition resistor?

A

By a series of colored bands around one end of the resistor

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8
Q

What three things must all electrical circuits contain?

A

A source of electrical energy, a load to use the energy, and conductors to join the source and the load.

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9
Q

What is the purpose of a capacitor?

A

To store electrical energy in electrostatic fields.

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10
Q

What is the basic unit of capacitance?

A

The farad

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11
Q

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

A

Tey are polarized. An electrolytic capacitor will pass current of one polarity, but will block current of the opposite polarity

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12
Q

What is meant by inductance?

A

The ability to store electrical energy in electromagnetic fields

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13
Q

What is the basic unit of inductance?

A

The henry

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14
Q

What is meant by impedance?

A

The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance and inductive reactance

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15
Q

How can you find the polarity of an electromagnet?

A

Hold the electromagnet in your left hand with your fingers encircling the coil in the direction the electrons flow. Your thumb will point to the north end of the electromagnet

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16
Q

In what units is impedance measured?

A

In ohms

17
Q

What is the basic unit of electrical power in a DC circuit?

A

The watt

18
Q

What is meant by a kilowatt?

A

1,000 watts

19
Q

What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?

A

The Current increases

20
Q

What are three types of DC circuits, with regard to the placement of the various circuit components?

A

Series, parallel and series-parallel

21
Q

How many cells are there in a 24 - volt lead-acid battery?

A

12

22
Q

What is the specific gravity of the electrolyte in a fully charged lead-acid battery?

A

Between 1.275 and 1.300

23
Q

What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply a correction when measuring its specific gravity?

A

Between 70 degrees and 90 degrees Fahrenheit

24
Q

What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?

A

A hydrometer

25
Q

How is a lead-acid battery compartment treated to protect it from corrosion?

A

Paint it with an asphaltic (tar base) paint or with poly-urethane enamel

26
Q

What is used to neutralize spilled electrolyte from a lead-acid battery?

A

A solution of bicarbonate of soda and water

27
Q

How high should the electrolyte level be in a properly serviced lead-acid battery?

A

Only up to the level of the indicator in the celll

28
Q

What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries are serviced?

A

The two types of batteries should be kept separate, and the tools used on one type should not be used on the other

29
Q

Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?

A

The electrolyte of a nickel-cadmium battery does not enter into the chemical changes that occur when the battery is charged or discharged. Its specific gravity does not change appreciably.

30
Q

What is used to neutralize spilled electrolyte from a nickel-cadmium battery?

A

A solution of boric acid and water

31
Q

What is meant by electromagnetic induction?

A

The transfer of electrical energy from one conductor to another that is not electrically connected

32
Q

How many ohms are in a megohm?

A

One million (1,000,000

33
Q

What part of an amp is a milliamp?

A

One thousandth (0.001)

34
Q

What is the basic unit of voltage?

A

The volt

General oral questions (3 decks)

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