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Electronic Principles

Electronic Principles
A device that converts light energy to electrical energy is called a:

None of these
solar cell
photo transistor
photodiode
thermocouple

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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?

None of these
600 V
4.73
0.4 V
24 V

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Electronic Principles
Thevenin theorem replaces a complicated circuit facing a load by an

Ideal voltage source and parallel resistor
Ideal current source and series resistor
Ideal current source and parallel resistor
None of these
Ideal voltage source and series resistor

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Electronic Principles
The barrier potential accross each depletion layer is

20 V
None of these
0.7 V
0.8 V

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Electronic Principles
Reducing the amount of current through an inductor:

has no effect on the inductance
None of these
multiplies the value of inductance by two
reduces the value of inductance by one-half
multiplies the value of inductance by four

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Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

9
81
None of these
6
85

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