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Electronic Principles

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?

None of these
2
3
43891
43922

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

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

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Electronic Principles
Current and voltage are said to be in phase when:

they have the same amplitude and frequency
All of these
None of these
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time

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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?

Permeability
Permeance
Reluctance
Retentivity
There is no valid comparison

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Electronic Principles
A loadstone is:

an artificial magnet
a paramagnetic alloy
None of these
a natural magnet
a temporary magnet

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Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

At least 10 Ohm
More than 100 k Ohm
Less than 10 Ohm
None of these
Less than 100 k Ohm

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