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Electronic Devices and Circuits

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

0.78 eV
5 eV
10 eV
2 eV

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Electronic Devices and Circuits
Piezoelectric quartz crystal resonators find application where

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

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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 semiconductor diode, the barrier offers opposition to

Majority carriers in both regions
Free electrons in N-region only
Majority as well as minority carriers in both regions
Holes in P-region only

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

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

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Electronic Devices and Circuits
How many free electrons does a p type semiconductor has?

Only those produced by thermal energy
Those produced by doping as well as thermal energy
Any of the above
Only those produced by doping

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