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Analog Electronics

Analog Electronics
What is the range of energy band gap of semiconductors ?

 10-15 ev
 0 ev
 14-15 ev
 1-3 ev

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Analog Electronics
An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is

5KΩ
1/5KΩ
1/11KΩ
11KΩ

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Analog Electronics
The softness factor for soft recovery and fast recovery diodes are respectively

 1, 1.
  1,
 1, >1.

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Analog Electronics
Three difference Q points are shown on a load line. The upper Q point represents the

 cutoff point.
  maximum current gain.
 intermediate current gain.
 minimum current gain.

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Analog Electronics
The per unit impedance of a synchorous machine is 0.242. If base voltage is increased by 1.1 times, then per unit value will be

 0.266.
  0.200.
 0.242.
 0.220.

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Analog Electronics
A zener diode voltage regulator has load requirement of 12 V and 2 Amp. The zener diode's minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is maximum efficiency of circuit?

 45.5 %.
 34.3 %.
 66.3 %.
 52.8 %.

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