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Electronic Principles

Electronic Principles
Who invented the first junction transistor?

Shockley
Smith
Gomes
Fisher
None of these

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Electronic Principles
Which is the most widely used semiconductor?

Copper
Germanium
None of these
All of these
Silicon

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

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

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

Reluctance
There is no valid comparison
Permeability
Retentivity
Permeance

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Electronic Principles
The emitter diode is usually

Nonconducting
None of these
Operating in the breakdwon region
Reverse-biased
Forward-biased

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

208 mA
7.8 mA
200 mA
300 mA
None of these

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