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Electronic Principles

Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

9
6
85
81
None of these

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Electronic Principles
What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

628 Ohm
444 Ohm
Less than 1 Ohm
None of these
100 Ohm

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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?

200 mA
208 mA
7.8 mA
None of these
300 mA

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Electronic Principles
If the base supply voltage increases, the Q point moves

down
nowhere
off the load line
up
None of these

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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
Flux density
Number of lines of force
Reluctance
Magnetomotive force

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Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Doping
Free electrons
None of these
Valence electrons
Thermal energy

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