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Electronic Principles

Electronic Principles
The net charge of a neutral copper atom is

None of these
4
1
-1

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Electronic Principles
The graph of current gain versus collector current indicates that the current gain

None of these
varies enormously
equals the collector current divided by the base current
is contant
varies slightly

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Electronic Principles
Most AC power is obtained from:

oscillators
batteries
generators
None of these
lightning

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Electronic Principles
Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?

None of these
200 k Ohm or more
20 km or less
200 k Ohm or less
20 k Ohm or more

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Electronic Principles
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

4.73
600 V
None of these
24 V
0.4 V

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

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

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