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Electronic Principles

Electronic Principles
When the collector current increases, what does the current gain do?

decreases
stays the same
increases
None of these
any of the above

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

208 mA
200 mA
300 mA
7.8 mA
None of these

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Electronic Principles
A device that converts thermal energy to electrical energy is called a:

piezoelectric devices
thermocouple
None of these
solar cell
chemical cell

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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?

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

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Electronic Principles
Silicon atoms combine into an orderly pattern called a

Covalent bond
Crystal
Semiconductor
Valence orbit
None of these

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Electronic Principles
What causes the depletion layer?

None of these
Barrier potential
Recombination
Ions
Doping

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