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Electronic Principles

Electronic Principles
A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

None of these
707 V
700 V
651 V
208 V

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

None of these
Reluctance
Magnetomotive force
Flux density
Number of lines of force

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Electronic Principles
As the temperature increases, the current gain

can be any of the above
contant
decreases
increases
None of these

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Electronic Principles
How many protons does the nucleus of a silicon atom contain?

4
None of these
14
29
48

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Electronic Principles
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

2
3
43891
None of these
43922

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

armature
None of these
commutator
brush
loop

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