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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Q. An increase in ambient temperature means that maximum power rating of transistor

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Q. Two CE stages are coupled through a capacitor. To calculate the quiescent base current of the two transistors, the capacitor is treated as

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Q. If it is desired to have low output impedance in an amplifier circuit then we should use

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Q. Generally the gain of a transistor amplifier falls at high frequencies due to the

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Q. A transistor with a = 0.9 and ICBO = 10 μA is biased so that IBQ = 90 μA. Then ICQ will be

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Q. A CB amplifier has a = 0.98 and RL = 600 Ω. If IE = 3.5 mA, the current gain is

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Q. funity of an op-amp is about 1 kHz.

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Q. Assertion (A): In an RC coupled amplifier the junction capacitances can be neglected at low frequencies but not at high frequencies

Reason (R): Capacitive reactance is inversely proportional to frequency.

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Q. In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is

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