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Electronic Principles

Electronic Principles
How may valence electrons does a silicon atom have?

None of these
1
4
2

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Electronic Principles
1 Microfarad is the same as:

1000 millifarads
1 million picofarads
1 million farads
None of these
1 millionth of a picofarad

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Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

None of these
60 Ohm
250 Ohm
70.7Ohm
99.3 Ohm

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

24 V
12 V
30 V
None of these
18 V

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Electronic Principles
If the current gain is 200 and the collector current is 100 mA, the base current is

0.083333333333333
200 A
2 mA
0.5 mA
None of these

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

generator
solar cell
chemical cell
None of these
thermocouple

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