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Analog Electronics MCQs | Page - 3
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Q. 21) An amplifier without feedback has a voltage gain of 50, input resistance of 1 KΩ & Output resistance of 2.5KΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is
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Q. 22) Generally, the gain of a transistor amplifier falls at high frequencies due to the
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Q. 23) In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is
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Q. 24) An amplifier using an opamp with slew rate SR=1v/μsec has a gain of 40dB. if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed
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Q. 25) A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of
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Q. 26) An npn BJT has gm=38mA/v, cμ =10¯14 F, cπ =10¯13F and DC current gain β0=90. For this transistor fT & fβ are
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Q. 27) The ideal OP-AMP has the following characteristics.
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Q. 28) The current gain of a bipolar transistor drops at high frequencies because of
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Q. 29) A dc power supply has no-load voltage of 30v, and a full-load voltage of 25v at full-load current of 1A. Its output resistance & load regulation ,respectively are
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Q. 30) Negative feedback in an amplifier
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