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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Q. Consider the following statements:

A totem pole configuration used in the output stage if an op-amp has the advantage of using

1. Only n-p-n BJTs
2. Complementary symmetrical pair of transistors
3. Only one transistor

Which of these statements is/are correct?

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Q. Assertion (A): An op-amp amplifier can amplify dc signal

Reason (R): An op-amp amplifier is a direct coupled amplifier

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Q. The most common method for biasing a JFET is

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Q. The h parameter equivalent circuit of BJT has one voltage source and one current source.

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Q. In an RC-coupled amplifier for improving the low frequency response

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Q. The minimum gate source voltage that creates the n-type inversion layer is called

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Q. At midband frequencies the coupling capacitor in RC coupled CE amplifier may be considered as

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Q. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?

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Q. If a class C power amplifier has an input signal with frequency of 200 kHz and the width of collector current pulses of 0.1 ms, then the duty cycle of the amplifier will be

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Q. An ideal voltage amplifier should have

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Q. In a class C operation VCC = 40 V, RL = 50 Ω. The maximum load power can be

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Q. IF VCC = 15 V, VCEQ = 5 V and ICQ = 50 mA, the efficiency in class A operation is

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Q. A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is

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Q. Which of the following best represents the bandwidth of an actual op-amp?

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Q. Class C amplifier is suitable for

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Q. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

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Q. A Wien bridge is suitable for

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