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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 electrons
Diffusion of holes
Diffusion of electrons
Drift of holes

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

5 eV
10 eV
0.78 eV
2 eV

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Electronic Devices and Circuits
The most commonly used semiconductor material is

None of these
Germanium
Silicon
Mixture of silicon and germanium

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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

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

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

Zero bias
Forward bias
Reverse bias
Zero or reverse bias

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Electronic Devices and Circuits
Piezoelectric quartz crystal resonators find application where

Rectification of the signal is required
Modulation of signal is required
Signal frequency control is required
Signal amplification is required

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