Analog Electronics
An ideal op-amp has zero slew rate.
Answer: B
An ideal op-amp has infinitely fast slew rate.
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Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum
Answer: C
For non-inverting terminal input, output is in phase with input. For inverting terminal input, output is 180° out of phase with input. If inputs have 180° phase difference, outputs will be in phase and additive.
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Two CE stages, 1 and 2 are coupled through a capacitor. VCC is the same for both. Base resistances RB1 and RB2 are such that RB1 > RB2. Then
Answer: C
Since RB2 < RB1> IB1.
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The open loop gain of an ideal op-amp is
Answer: A
An ideal op-amp has infinite open loop gain.
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An amplifier with loop gain Aβ will be more stable for value of Aβ as
Answer: B
A feedback amplifier is stable if loop gain is less than unity. More less, more stable, hence β will be more stable.
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A difference amplifier using op-amp has closed loop gain = 50. If input is 2 V to each of inverting and non-inverting terminals, output is 5 mA. Then CMRR =
Answer: A
.
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A differential amplifier consists of two CB amplifiers.
Answer: B
It consists of two CE amplifiers.
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Which of the following is not a necessary advantage of negative feedback system?
Answer: B
Feedback may or may not improve stability. Moreover feedback may also cause instability.
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The units of transistor h parameters h11 and h22 are the same.
Answer: B
The units of h11 are ohms and units of h22 siemens.
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A transistor with a = 0.9 and ICBO = 10 μA is biased so that IBQ = 90 μA. Then IEQ will be
Answer: D
IEQ = ICQ + IBQ = 910 μA + 90 μA 
990 μA.
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