Analog Electronics - ECE Questions and Answers

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Two identical FETs each having parameters g_m and r_d are connected is parallel. The composite FET has parameters

0.5 g_m and 2 r_d

0.5 g_m and 0.5 r_d

2 g_m and 2 r_d

2 g_m and 0.5 r_d

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If f is more than f_unity the gain of op-amp becomes less than 1.

True

False

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For an amplifier the input output signals are shown in figure. The class of amplifier is

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In a N-P-N transistor the function of the emitter is

to emit or inject holes into the collector

to emit or inject electrons into the collector

to emit or inject electrons into the base

to emit or inject holes into the base

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The noise figure is

3 dB

6 dB

6.6 dB

12 dB

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A Darlington pair is used for

low distortion

high frequency range

high power gain

high current gain

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In a shunt-shunt negative feedback amplifier, as compared to the basic amplifier

both input and output impedances, decrease

input impedance decreases but output impedance increase

I/P impedance increases but O/P impedance decreases

both input and O/P impedance increases

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In rectifiers the use of RC filters is recommended when

load current is high

load current is small

load current is neither high nor small

either (a) or (c)

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The coupling capacitor mainly affects

bandwidth

lower cut-off frequency

higher cut-off frequency

both lower as well as higher cut-off frequency