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Electronic Principles

Electronic Principles
What causes the depletion layer?

Barrier potential
Recombination
None of these
Doping
Ions

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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
None of these
24 V
12 V
18 V

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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?

250 Ohm
60 Ohm
70.7Ohm
None of these
99.3 Ohm

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Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

P = E2/R
None of these
P = IE
I = P/E
P = I2R

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Electronic Principles
The value of a capacitor can be made larger by:

decreasing the area of the plates
increasing the area of the plates
increasing the voltage applied to the plates
None of these
increasing the frequency of the applied voltage

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Electronic Principles
What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

None of these
444 Ohm
100 Ohm
628 Ohm
Less than 1 Ohm

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