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Electronic Principles

Electronic Principles
A device that converts mechanical into electrical energy is?

None of these
solar cell
generator
thermocouple
chemical cell

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Electronic Principles
At room temperature a conductor has low many holes?

many
Only those produced by thermal energy
less than the free electrons
None of these
Same number as free electrons

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Electronic Principles
Current and voltage are said to be in phase when:

All of these
they have the same amplitude and frequency
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time
None of these

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Electronic Principles
Holes are the minority carriers in which type of semiconductor?

Extrinsic
n-type
Intrinsic
None of these
p-type

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Electronic Principles
What is the inductive reactance of a 2-H coil operating at 60 Hz?

30 Ohm
60 Ohm
754 Ohm
120 Ohm
None of these

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Electronic Principles
Which one of the following devices is most often used for measuring electrical potential difference?

Wattmeter
Ohmmeter
Ammeter
Voltmeter
None of these

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