Q. Consider 49 cascaded amplifiers having individual rise time as 2 n sec. 3 n sec. ... 50 n sec. The input waveform rise time is 1 n sec. Then the output signal rise time is given time by (Assume output signal rise time is measured within 10 percent range of the final output signal.)

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Q. In a capacitor filter, the time constant RLC should be small.

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Q. A 741 type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a -3dB bandwidth of

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Q. In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is

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Q. In the graphical analysis of an amplifier circuit, the slope of dc load line depends on

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Q. In a self bias circuit for CE amplifier, an increase in emitter resistance RE results in

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Q. For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IE

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Q. When the circuit is switched on, the loop gain of a Wien bridge oscillator is

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Q. The input to integrating op-amp is a rectangular wave. The output will be

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Q. The most widely used diode rectifier circuit is

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Q. The main advantage of a crystal oscillator

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Q. Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C

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Q. A voltage tripler circuit and voltage quadrupler circuit use identical components. Then

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Q. A Ge diode operated at a junction temperature of 27°C. For a forward current of 10 mA, VD is found to be 0.3 V. If VD = 0.4 V then forward current will be

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Q. In a power amplifier the collector current flows for 270° of the input cycle. The operations is

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Q. An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are

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Q. In a negative feedback amplifier A = 100, β = 0.04 and Vs = 50 mV, then feedback will be

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Q. A voltage doubler circuit is fed by a voltage Vm sin ωt. The output voltage will be nearly 2 Vm only if

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Q. The purpose of connecting a coupling capacitor in the output circuit of an amplifier is

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Q. A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is

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