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Electronic Principles

Electronic Principles
Which is the most widely used semiconductor?

Germanium
Copper
Silicon
None of these
All of these

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

0.4 A
0.6 A
0.3 A
0.2 A
None of these

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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?

None of these
18.2 mA
16.3 mA
55 A
55.86 A

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Electronic Principles
The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?

0.041666666666667
0.93 V
9.3 W
None of these
0.93 W

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Electronic Principles
Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

Voltmeter
None of these
Ammeter
Wattmeter
Ohmmeter

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Electronic Principles
The nucleus of the copper atom contains how many protons?

29
None of these
4
1
18

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