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Electronic Principles

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

Wattmeter
Voltmeter
Ammeter
Ohmmeter
None of these

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Electronic Principles
Suppose the peak value of a sinusoidal voltage is 50 V. What is the rms value?

None of these
38.74 V
30.4 V
37.4 V
35.4 V

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Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Valence electrons
Free electrons
Thermal energy
None of these
Doping

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Electronic Principles
What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

628 Ohm
444 Ohm
Less than 1 Ohm
100 Ohm
None of these

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Electronic Principles
What form of energy is used for creating static electricity?

Light energy
Chemical energy
Solar energy
None of these
Mechanical energy

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Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?

Magnetomotive force
Flux density
Number of lines of force
Reluctance
None of these

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