ELECTRONIC DEVICES AND CIRCUITS QUIZ

At room temperature the current in an intrinsic semiconductor is due to

Holes

Holes and electrons

Ions

Electrons

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

Drift of holes

Diffusion of electrons

Diffusion of holes

Drift of electrons

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Which variety of copper has the best conductivity?

Hard drawn copper

Pure annealed copper

Induction hardened copper

Copper containing traces of silicon

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The most commonly used semiconductor material is

Mixture of silicon and germanium

None of these

Silicon

Germanium

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In a bipolar transistor, the base collector junction has

Zero bias

Reverse bias

Zero or forward bias

Forward bias

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Silicon is not suitable for fabrication of light emitting diodes because it is

Narrowband gap semiconductor

Direct band gap semiconductor

An indirect band gap semiconductor

Wideband gap semiconductor

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As compared to bipolar junction transistor, a FET

Is less noisy

Has better thermal stability

All of these

Has higher input resistance

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In a semiconductor diode, the barrier offers opposition to

Free electrons in N-region only

Holes in P-region only

Majority as well as minority carriers in both regions

Majority carriers in both regions

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Permalloy is

A variety of stainless steel

A nickel an iron alloy having high permeability

A conon-ferrous alloy used in aircraft industry

A polymer

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The depletion layer width of Junction

Increases with heavy doping

Is increased under reverse bias

Is independent of applied voltage

Decreases with light doping

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