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Electronics

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Q.

A semiconductor has an electron concentration of  and a hole concentration of . Calculate its conductivity. Given electron mobility = 0.135 m2V–1s–1; hole mobility = 0.048 m2V–1s–1.

Q.

In a transistor, the base-current is changed by . This result in a change of 0.01 V in base to emitter voltage, and a change of 1.0 mA in the collector-current Find the current gain . 

Q.

Name of logic gate whose repeated use can lead to a digital circuit.

Q.

The given logic symbol represents a gate called :

                                          

Q. Name of logic gate whose repeated use can lead to a digital circuit?

NAND gate

Q. A junction diode can be used for?

Rectification

Q. diode can be used for amplification?

NO,

It can be used for a lot of things, but amplification, generally, no. For amplification you need a thing with either voltage or current gain or both. It also is a big help if it has separate paths for input and output. A diode has just two terminals, three is the minimum to have separate inputs and outputs.

The one exception is the tunnel diode, which has negative resistance and therefore can amplify. Its a heck of a mess to keep it from oscillating as the input and output terminals are the same.

Q. When a forward bias is applied to a p-n junction, What happens?

It Lowers the potential barrier

Q. The current gain in a common emitter transistor is?

Current gain in the common emitter circuit is obtained from the base and the collector circuit currents. Because a very small change in base current produces a large change in collector current, the current gain (β) is always greater than unity for the common-emitter circuit, a typical value is about 50