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Analog Electronics

Analog Electronics
The properties of JFET resemble those of

  UJT.
  NPN transistors.
  thermionic valves.
  PNP transistors.

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Analog Electronics
A voltage regulator is a circuit which

  smoothed the AC variation in DC output voltage.
  converts the AC voltage to DC voltage.
  maintains constant DC output voltage inspite of the fluctu
None of these

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Analog Electronics
The amount of time between the creation and disappearance of a free electrons is called

 recombination
 drift velocity
 life time of the carriers
 bound electrons

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Analog Electronics
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

fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz
fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

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Analog Electronics
In CB configuration, the output V-I characteristics of a transistor are drawn by taking

  VCB versus IB for constant IE.
  VCB versus IB for constant IE.
  VCE versus IC for constant IE.
  VCB versus IC for constant IE.

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Analog Electronics
The Q-point in a voltage amplifier is selected in the middle of the active region because

  it gives better stability.
  the circuit needs a small.
  it gives distortions less output.
  the biasing circuit then need less number of resistors.

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