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Analog Electronics

Analog Electronics
In an NPN transistor, the majority carriers in the emitter are

 holes.
 both.
  free electrons.
 neither.

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Analog Electronics
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250, are cascaded. The open circuit voltage gain of combined amplifier is

49dB
102dB
51dB
98dB

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Analog Electronics
A LED produces light when

  reverse biased.
None of these
  unbiased.
  forward biased.

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Analog Electronics
A JFET can operate in

  depletion and enhancement mode only.
  none of these.
  depletion mode only.
  enhancement mode only.

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Analog Electronics
The room temperature resistivity of pure silicon is

 300
 50
 3000
 6

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Analog Electronics
In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

  source.
  zener diode.
  zener resistance.
  series resistor.

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