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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Q. If the midband gain of an amplifier is 40 dB, the gain at half power frequency is

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Q. It is desired to reduce distortion in an amplifier from 8% to 2% by using 5% negative feedback. The open and closed loop gains respectively are

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Q. An ideal op-amp requires

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Q. A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What percentage negative feedback should be introduced to the amplifier so that linear oscillations result?

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Q. The advantage of Weinbridge oscillator over the phase shift oscillator is that oscillator the frequency may be varied over a range of

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Q. An inverting amplifier has R1 = 10 kΩ, and Rf = 150 kΩ then the O/P voltage, if input voltage Vi = 1 volt.

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