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Electronic Principles

Electronic Principles
Silicon atoms combine into an orderly pattern called a

None of these
Covalent bond
Crystal
Valence orbit
Semiconductor

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

208 mA
7.8 mA
300 mA
None of these
200 mA

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Electronic Principles
Doubling the operating voltage of a purely capacitive circuit:

cuts the capacitive reactance in half
has no effect on the capacitive reactance
doubles the amount of capacitive reactance
multiplies the capacitive reactance by 7
None of these

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Electronic Principles
A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

0.41666666666667
0.1 A
None of these
1000 A
100 A

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Electronic Principles
At room temperature an intrinsic semiconductor has

None of these
many holes
No holes
many free electrons
a few free electrons and holes

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Electronic Principles
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

68.4 mA
34.4 mA
None of these
24.2 mA
28.4 mA

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