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Electronic Principles

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

loop
brush
None of these
commutator
armature

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Electronic Principles
Which one of the following kinds of materials has the lowest permeability?

A diamagnetic material
A feiTomagnetic material
None of these
A paramagnetic material
All of these

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Electronic Principles
Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

18.8 V
None of these
10.17 V
0.17 V
20 V

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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
0.3 A
0.6 A
0.2 A
None of these

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Electronic Principles
For normal operation of the transistor, the collector diode has to be

None of these
Reverse-biased
Nonconducting
Operating in the breakdown region
Forward-biased

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Electronic Principles
The Thevenin resistance is equal in value to the

None of these
Open-load resistance
Internal resistance of a Morton circuit
Half the load resistance
Load resistance

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