Q. An op-amp is fed from a signal source through resistance R1. If it is to work as sign changer, the feedback resistance Rf should be

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Q. A multivibrator can be used as a

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Q. A multivibrator generates

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Q. The derating factor, for ambient temperature higher than specified, for a transistor is about

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Q. Efficiency of a half wave diode rectifier is less than 40%.

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Q. Generally op amp is used in

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Q. The equivalent circuit of an op-amp has

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Q. In a transistor with normal bias

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Q. A transistor has

1. collector
2. emitter
3. base

In a N-P-N transistor the electron flow into the transistor at

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Q. A three terminal monolithic IC regulator can be used as

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Q. Which of the following is not the main characteristic of a FET?

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Q. The basic amplifier in Weinbridge oscillator consists of

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Q. To obtain very high I/P and O/P impedances in a feedback amplifier, the topology used is

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Q. The gate-source voltage that reduces the drain current to approximately zero is called

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Q. In a half wave voltage doubler circuit the input frequency is 50 Hz. The ripple frequency is

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Q. Class A amplifiers are preferred when

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Q. The ac input voltage of an amplifier

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Q. Assertion (A): Negative feedback reduces the gain of an amplifier

Reason (R): Negative feedback is very commonly used in amplifier circuits

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Q. The emitter resistor RE in the emitter of CE amplifier stabilizes the dc operating point against variation in

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Q. A radio frequency choke permits an easy flow of __________ current and at the same time it offers a very impedance to __________ currents.

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