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Analog Electronics

Analog Electronics
Which process is used for adding impurity into a pure semiconductor material ?

 Insulating
 Conducting
 Doping
None of these

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Analog Electronics
Suppose the base resistor is open. The Q point will be

 at the upper end of the load line.
 off the load line.
 in the middle of the load line.
  at the lower end of the load line.

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Analog Electronics
The voltage across the zener resistance is usually

  measured in volts.
  small.
  subtracted from the breakdown voltage.
  large.

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

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Analog Electronics
Voltage controlled oscillators are used commonly in

 Frequency Modulators
 Phase Clocked loops
 Pulse Modulators Frequency Modulators Phase Clocked loops
 All the above

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Analog Electronics
In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the

  base - emitter junction.
 collector - base junction.
 base - collector junction.
 recombination path.

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