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Electronic Principles

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

None of these
brush
commutator
loop
armature

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Electronic Principles
A real voltage source has

A small internal resistance
A large internal resistance
Zero internal resistance
None of these
Infinite internal resistance

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Electronic Principles
A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

16 V
15 V
7.5 V
8 V
None of these

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

Stays the same
Increases
0oC
Decreases
None 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?

None of these
0.2 A
0.6 A
0.4 A
0.3 A

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Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?

There is no valid comparison
Retentivity
Permeance
Permeability
Reluctance

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