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Electronic Principles

Electronic Principles
A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?

10 mW
200 mW
20 mW
None of these
300 mW

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Electronic Principles
At room temperature an intrinsic semiconductor has

a few free electrons and holes
many free electrons
many holes
No holes
None of these

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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?

3
43922
None of these
43891
2

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Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

400 Ohm
410 Ohm
550 Ohm
310 Ohm
None of these

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Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

99.3 Ohm
250 Ohm
None of these
70.7Ohm
60 Ohm

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Electronic Principles
A basic capacitor is composed of:

two coils separated by a dielectric
None of these
two coils separated by a conductor
two dielectrics separated by a conductor
two conductors separated by a dielectric

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