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Electronic Principles

Electronic Principles
The net charge of a neutral copper atom is

4
-1
1
None of these

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Electronic Principles
The number of free electrons and holes in intrinsic semiconductor increases when the temperature

None of these
Decreases
Stays the same
0oC
Increases

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Electronic Principles
Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

None of these
18.8 V
0.17 V
10.17 V
20 V

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Electronic Principles
What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm

180 degree
75 degree
None of these
30 degree
45 degree

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Electronic Principles
A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?

55.86 A
18.2 mA
None of these
16.3 mA
55 A

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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?

30 V
12 V
18 V
None of these
24 V

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