Q. Which of the following values represents the open loop gain of typical op-amp?

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Q. Which of the following configuration has low thermal stability?

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Q. Efficiency of class A power amplifier is very poor.

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Q. An ideal op-amp can amplify dc signals

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Q. Consider the following statements :The lower cut off frequencies of an RC coupled amplifier depend on

1. input and output coupling capacitor
2. emitter by pass capacitors
3. junction capacitances

Which of the above are correct?

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Q. Assertion (A): In a circuit using FET, gate is approximately at dc ground

Reason (R): Self bias stabilizes the quiescent operating point against changes in JFET parameters

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Q. The Darlington pair consists of the following two stages

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Q. A Clapp's oscillator is

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Q. A quiescent state of a transistor implies

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Q. A transistor may fail due to

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Q. In a P-N-P transistor, with normal bias, the emitter junction

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Q. The pinch-off voltage is the drain voltage on the shorted gate drain curve above which the drain current becomes

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Q. Which of the following plot can be used to show the input volt-ampere characteristics of a common-emitter configuration?

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Q. A transconductance amplifier has

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Q. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The output signal-to-noise ratio is

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Q. In order to protect a MOSFET against damage from any stray voltage at the gate

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Q. A dc amplifier can operate

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Q. Assertion (A): In a common source amplifier with source terminal at ac ground the voltage gain is about gm rd

Reason (R): A common source amplifier is a source follower circuit

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Q. Thermal runaway will take place if the quiescent point is such that

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Q. In applications where __________ input resistance is needed, the JFET is preferred to the bipolar transistor.

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