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Electronic Principles

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

thermocouple
solar cell
photo transistor
None of these
photodiode

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

Thermal energy
None of these
Free electrons
Doping
Valence electrons

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

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

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Electronic Principles
Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

0.17 V
20 V
10.17 V
18.8 V
None of these

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Electronic Principles
The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

250 µA
0.25 µA
300 µA
350 µA
None of these

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Electronic Principles
A device that converts mechanical into electrical energy is?

chemical cell
None of these
solar cell
thermocouple
generator

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