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Electronic Principles

Electronic Principles
A device that converts mechanical into electrical energy is?

generator
None of these
chemical cell
thermocouple
solar cell

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Electronic Principles
When the collector current increases, what does the current gain do?

stays the same
increases
decreases
None of these
any of the above

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Electronic Principles
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

43922
3
2
43891
None of these

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Electronic Principles
A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

20 k Ohm
2 k Ohm
None of these
10 k Ohm
1 k Ohm

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Electronic Principles
In an intrinsic semiconductor, the number of free electrons

Is greater than the number of holes
Impossible to say
Is less than the number of holes
None of these
Equals the number of holes

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Electronic Principles
A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

0.41666666666667
None of these
0.1 A
100 A
1000 A

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