Q. To draw ac equivalent circuit for a CE amplifier we should

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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 noise factor is

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Q. Assertion (A): The gain of an FET amplifier can be changed by changing gm

Reason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading

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Q. The element in the feedback circuit of a logarithmic amplifier using op-amp is

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Q. In a FET, gm varies as

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Q. Assertion (A): Class A and Class B amplifier predominate in audio applications.

Reason (R): Class C amplifier is used at radio frequencies.

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Q. For an ideal noise free transistor amplifier the noise factor is

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Q. In a crystal

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Q. Ultra high frequency oscillators work in the range

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Q. N-channel FETs are superior to p-channel FETs because

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Q. It is desired to reduce distortion in a CE amplifier circuit. We should

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Q. For a push pull circuit the most favoured biasing method is

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Q. In feedback amplifier the closed loop gain is nearly independent of open loop gain and depends only on the feedback factor.

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Q. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased, the transistor will operate in

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Q. Transformer coupling is mostly used in

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Q. Which of the following method cannot be used to increase the bandwidth for cascaded RF amplifier stages?

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Q. The current ICBO flows in

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Q. The h parameter h11 is the same in CE and CC circuit.

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Q. A second-order band-pass active filter can be obtained by cascading a low pass second order section having cut off frequency fOH with a high pass second order section having cut-off frequency fOL provided

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Q. A sine wave is passed through an amplifier which severely limits it symmetrically. If then passes to a second amplifier which is narrow band and tuned to the frequency of the original sine wave. What will be the output wave from this second amplifier?

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