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Electronic Devices and Circuits

Electronic Devices and Circuits
The forbidden energy gap between the valence band and conduction band will be least in case of

Metals
Insulators
All of these
Semiconductors

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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

99
1.01
0.99
100

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Electronic Devices and Circuits
The amount of photoelectric emission current depends on

None of these
Intensity of incident radiation
Frequency of incident radiation
Both frequency and intensity of incident radiation

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

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

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Electronic Devices and Circuits
The sensitivity of human eyes is maximum at

Green portion of spectrum
Red portion of spectrum
Violet portion of spectrum
White portion of spectrum

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Electronic Devices and Circuits
Silicon is not suitable for fabrication of light emitting diodes because it is

Wideband gap semiconductor
Direct band gap semiconductor
An indirect band gap semiconductor
Narrowband gap semiconductor

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