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Electronic Devices and Circuits

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

1.01
99
100
0.99

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Electronic Devices and Circuits
If too large current passes through the diode

All holes will freeze
Excessive heat may damage the diode
Diode will emit light
All electrons will leave

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

2 eV
10 eV
0.78 eV
5 eV

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Electronic Devices and Circuits
Permalloy is

A nickel an iron alloy having high permeability
A variety of stainless steel
A polymer
A conon-ferrous alloy used in aircraft industry

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Electronic Devices and Circuits
At room temperature the current in an intrinsic semiconductor is due to

Holes
Ions
Holes and electrons
Electrons

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Electronic Devices and Circuits
Free electrons exist in

Conduction band
Third band
First band
Second band

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