Analog Electronics
The gain of an FET amplifier can be changed by changing
Answer: B
Gain is proportional to gm .
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The ripple factor of a half wave rectifier is more than 2.
Answer: B
Ripple factor of half wave rectifier is 1.21 .
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The coupling capacitor in amplifier circuits
Answer: B
Capacitor is open-circuit for dc.
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Assertion (A): In CE amplifier the emitter is at ground potential for ac signals
Reason (R): A CE amplifier has near unity voltage gain
Answer: C
CE amplifier has good voltage gain.
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A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is
Answer: C
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In a CE amplifier drives a low load resistance directly the result will be
Answer: A
Low load resistance means high current and hence over loading.
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If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
Answer: C
As we know, Gain with feedback
A = - 1000, β = -0.1 .
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For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IB
Answer: A
.
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The value of parameter re used in re transistor model
Answer: A
.
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In a two stage CE amplifier circuit, the ac collector resistance of the first stage depends on
Answer: C
Since the first amplifier is feeding the second stage, the input impedance of second stage is the ac collector resistance of first stage.
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