Q. To obtain very high I/P and O/P impedances in a feedback amplifier, the topology used is

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Q. The gate-source voltage that reduces the drain current to approximately zero is called

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Q. In a half wave voltage doubler circuit the input frequency is 50 Hz. The ripple frequency is

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Q. Class A amplifiers are preferred when

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Q. The ac input voltage of an amplifier

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Q. Assertion (A): Negative feedback reduces the gain of an amplifier

Reason (R): Negative feedback is very commonly used in amplifier circuits

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Q. The emitter resistor RE in the emitter of CE amplifier stabilizes the dc operating point against variation in

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Q. A radio frequency choke permits an easy flow of __________ current and at the same time it offers a very impedance to __________ currents.

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Q. Assertion (A): In an op-amp the gain bandwidth product equals infinity

Reason (R): The change in open loop gain of an amplifier has almost no effect on closed loop gain

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Q. Lower chip area requirements of MOS is advantage in

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Q. For high frequency response of a transistor amplifier, suitable model to use is

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Q. A transistor with α = 0.98 then β will be

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Q. Harmonic distortion in CB amplifier may be least when the load resistance is

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Q. If a common emitter amplifier with an emitter resistance RC has an overall transconductance gain of 1 m A/V, a voltage gain of - 4 and desensitivity of 50, then the value of the emitter resistance R would be

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Q. Turn on time of a transistor switch is equal to sum of (where tr is rise time, td is delay time)

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Q. In amplifiers, the parasitic oscillation result due to

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Q. A ripple in collector supply voltage of the output stage of amplifier causes noise.

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Q. In a transistor IE = 10 mA, ICO = 0.5 μA and α = 0.995. Then ICEO =

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Q. As a compared to a CB amplifier, a CE amplifier has

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Q. The stray capacitance between the last stage and the first stage of an oscillator may cause

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