Electronic Devices and Circuits - ECE Questions and Answers

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The inductance of a single layer solenoid of 10 turns is 5 μH. Which one of the following is the correct value of inductance when the number of turns is 20 and the length is doubled.

10 μH

20 μH

40 μH

5 μH

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The depletion layer width of Junction

decreases with light doping

is independent of applied voltage

is increased under reverse bias

increases with heavy doping

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Forbidden energy gap in germanium at 0 K is about

10 eV

5 eV

2 eV

0.78 eV

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Light dependent resistors are

highly doped semiconductor

intrinsic semiconductor

lightly doped semiconductor

either (a) or (c)

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Fermi level is the amount of energy in which

a hole can have at room temperature

an electron can have at room temperature

must be given to an electron move to conduction band

none of the above

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When avalanche breakdown occurs covalent bonds are not affected.

True

False

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In p channel JFET, V_GS is positive.

True

False

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Human body cannot sustain electric current beyond

1 μA

10 μA

5 μA

35 μA

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To produce p type semiconductor we add

acceptor atoms

donor atoms

pentavalent impurity

trivalent impurity