Analog Electronics - ECE Questions and Answers

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Low frequency response of amplifier is mainly limited by

input capacitor

bypass capacitor

output capacitor

biasing capacitor

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With negative feedback the closed loop gain is always less than open loop gain.

True

False

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As compared to a bipolar transistor, a JFET is

highly sensitive to changes in input voltage

more sensitive to changes in input voltage

less sensitive to changes in input voltage

equally sensitive to changes in input voltage

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In a bistable multivibrator, commutating capacitors are used to

increase the base storage charge

provide ac coupling

increase the speed of response

alter the frequency of the output

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Two 3Ω speakers in series will have a total impedance of

1 Ω

3 Ω

6 Ω

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The input resistance R_i of the amplifier shown in the figure

100 kΩ

40 kΩ

∞

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In a CE amplifier the ac signal is increased. Which of the following will not change?

Ac base voltage

Ac collector voltage

Ac emitter voltage

Ac collector voltage and ac emitter voltage

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The ideal op-amp has the following characteristics

R_i = ∞, A = ∞, R₀ = 0

R_i = 0, A = ∞, R₀ = 0

R_i = ∞, A = 0, R₀ = 0

R_i = 0, A = ∞, R₀ = ∞

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The input differential stage of op-amp. 741 is baised at about 10 μA current such a low current of the input stage gives

high CMRR
high differential gain
low differential
high input impedance

Which of these are correct?

1 and 2

1, 2 and 4

3 and 4

1, 2, 3 and 4