Q. The feedback resistance rd in small signal model of MOSFET is of the order of

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Q. Which amplifier has a voltage gain of less than 1?

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Q. A clamper

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Q. For holding the drain current constant in spite of large changes in JFET parameters

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Q. The main disadvantage of a JFET is

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Q. For Q >> 1, the output frequency of LC oscillator is equal to resonant frequency.

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Q. The transconductance curve of a JFET is

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Q. The input resistance R, of an ideal voltage amplifier is __________ and that of a current amplifier is __________ .

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Q. In CE amplifier circuit, voltage gain is directly proportional to

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Q. The heat sink disposes off heat mainly by

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Q. A major advantage of TWT over a Klystron lies in its

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Q. Pick the odd-one out

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Q. In a CE amplifier the output coupling capacitor is short circuited. The dc collector voltage

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Q. A certain transistor has αdc of 0.98 and a collectors leakage current of 5 μA. If IE = 1 mA, the collector current will be

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Q. If 1.5% of the output of an amplifier is feedback positively to the input, the minimum gain required of the amplifier for oscillations to occur, is

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Q. The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load

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Q. Two 3Ω speakers in series will have a total impedance of

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Q. In a CE amplifier the ac signal is increased. Which of the following will not change?

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Q. The ideal op-amp has the following characteristics

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Q. The input differential stage of op-amp. 741 is baised at about 10 μA current such a low current of the input stage gives

1. high CMRR
2. high differential gain
3. low differential
4. high input impedance

Which of these are correct?

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