Q. A buffer amplifier should have

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Q. If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is

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Q. An npn transistor has a Beta cutoff frequency fβ of 1 MHz, and a common emitter short circuit low frequency current gain β0 of 200. It unity gain frequency fT and the alpha cut off frequency fa2 respectively are

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Q. If input frequency is 50 Hz, the frequency of output wave in a full wave diode rectifier circuit is

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Q. A class A transformer coupled power amplifier is to deliver 10 W output. The power rating of transistor should not be less than

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Q. A half wave diode rectifier uses a diode having forward resistance of 50 ohms. The load resistance is also 50 ohms. Then the voltage regulation is

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Q. A Hartley oscillator is used for

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Q. In Class C operation the collector current looks like

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Q. An op-amp integrating circuit uses

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Q. Which of the following can be used as a buffer amplifier?

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Q. A second order active bandpass filter can be obtained by cascading LP second order filter having higher cut off frequency fOH with a second order HP filter having lower cut off frequency fOL provided

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Q. The open loop gain of an amplifier is 50 but likely to decrease by 20% due to various factors. If negative feedback with β = 0.1 is used, the change in gain will be about

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Q. A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are

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Q. The main advantage of CC amplifier is

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Q. If a = 0.995, IE = 10 mA, ICO = 0.5 mA, then ICEO will be

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Q. Assertion (A): In class C amplifier the efficiency is more than that for other classes of amplifiers

Reason (R): In class C amplifier we can get high efficiency over a wideband

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Q. Heat sink results in

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Q. A buffer amplifier should have

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Q. In a CE amplifier, the output voltage is equal to product of

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Q. A diode can have a very high forward resistance.

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