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Electronic Devices and Circuits

Electronic Devices and Circuits
For a NPN bipolar transistor, what is the main stream of current in the base region?

Drift of holes
Diffusion of electrons
Diffusion of holes
Drift of electrons

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Electronic Devices and Circuits
Forbidden energy gap in germanium at 0 K is about

10 eV
0.78 eV
2 eV
5 eV

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Electronic Devices and Circuits
A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

0.99
100
1.01
99

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Electronic Devices and Circuits
Fermi level is the amount of energy in which

Must be given to an electron move to conduction band
A hole can have at room temperature
An electron can have at room temperature
None of these

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Electronic Devices and Circuits
Light dependent resistors are

Either A or B
Lightly doped semiconductor
Intrinsic semiconductor
Highly doped semiconductor

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Electronic Devices and Circuits
In a bipolar transistor, the emitter base junction has

Forward bias
Reverse bias
Zero or reverse bias
Zero bias

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