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Electronic Devices and Circuits

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

Reverse bias
Zero bias
Zero or forward bias
Forward bias

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Electronic Devices and Circuits
Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.

False
True

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Electronic Devices and Circuits
Permalloy is

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

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Electronic Devices and Circuits
Free electrons exist in

Second band
Third band
First band
Conduction band

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Electronic Devices and Circuits
Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

Normal to both current and magnetic field
In the direction of current
In arbitrary direction
Antiparallel to magnetic field

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

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

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