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Electronic Principles

Electronic Principles
Which is the most widely used semiconductor?

None of these
Silicon
Germanium
All of these
Copper

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

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

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Electronic Principles
Doubling the number of turns of wire in an inductor:

None of these
multiplies the value of inductance by four
reduces the value of inductance by one-half
reduces the value of inductance by one-fourth
multiplies the value of inductance by two

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Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current?

I = P/E
P = IE
P = E2/R
P = I2R
None of these

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Electronic Principles
The emitter diode is usually

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

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

0.3 A
None of these
0.4 A
0.6 A
0.2 A

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