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Analog Electronics

Analog Electronics
The base-emitter voltage of the second approximation is

  0.7 V.
 1 V.
 0 V.
 0.3 V.

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

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Analog Electronics
If the series resistance increases in an unloaded zener regulator, the zener current

  stays the same.
  increases.
  equals the voltage divided by the resistance.
  decreases.

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Analog Electronics
Assume that diode D1, D2 in figure are ideal diodes. The value of current is mcq-diagram

 0 mA.
 1 mA.
 2 mA.
 0.5 mA.

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Analog Electronics
The reverse saturation electric current of a pn junction varies with temperature (T) as

  1 / T.
  independent of T.
  T.
  T2.

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Analog Electronics
The room temperature resistivity of pure silicon is

 6
 300
 3000
 50

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