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Electronic Principles

Electronic Principles
Which is the most widely used semiconductor?

Copper
Silicon
All of these
None of these
Germanium

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Electronic Principles
The emitter diode is usually

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

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Electronic Principles
A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

60 Ohm
10 Ohm
50 Ohm
None of these
100 Ohm or more

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Electronic Principles
Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?

20 W
100 W
None of these
200 W
1000 W

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

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

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Electronic Principles
The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

14.8 µA
10.3 µA
7.8 µA
None of these
7.75 µA

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