Analog Electronics - ECE Questions and Answers

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The multivibrator circuit that has a typical application of converting sinusoidal input into a square wave output is

emitter coupled binary

Schmitt trigger

monoshot multivibrator

free-running multivibrator

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Symbol shown in figure represents a

P-channel enhancement MOSFET

N-channel DEMOSFET

UJT with P-type base

UJT with N-type base

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The feedback resistance r_d in small signal model of MOSFET is of the order of

1000 MΩ

1 MΩ

1 KΩ

100 Ω

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Which amplifier has a voltage gain of less than 1?

Common emitter

Common collector

Common base

Both CB and CC

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A clamper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

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For holding the drain current constant in spite of large changes in JFET parameters

current source bias is used

voltage divider bias is used

reverse bias is used

no bias is used

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The main disadvantage of a JFET is

low gain-bandwidth product

high noise level

high cost

low gain

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For Q >> 1, the output frequency of LC oscillator is equal to resonant frequency.

True

False

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At the peak of negative half cycle in figure

diode A is forward biased and diode B is reverse biased

both diodes are reverse biased

both diodes are forward biased

diode A is reverse biased and diode B is forward biased