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Electronic Principles

Electronic Principles
The rotating coil of wire in an electric motor is called the:

None of these
commutator
brush
armature
loop

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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?

28.4 mA
24.2 mA
None of these
68.4 mA
34.4 mA

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Electronic Principles
Which is the most widely used semiconductor?

Copper
Germanium
All of these
Silicon
None of these

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Electronic Principles
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

4.73
600 V
0.4 V
24 V
None of these

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Electronic Principles
At room temperature an intrinsic semiconductor has

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

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Electronic Principles
When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:

parallel RC circuit
parallel RLC circuit operated above its resonant frequency
None of these
parallel RL circuit
purely resistive circuit

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