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Analog Electronics

Analog Electronics
For Germanium pn junction, the maximum value of barrier potential is

 0.3V
 0.7V
 1.5V
 1.6V

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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 =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
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

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Analog Electronics
Which of the following cannot actually move?

 Electrons
 Ions
 All the above
 Holes

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Analog Electronics
The silicon transistor are more widely used than germanium transistors because

  they have larger electric current carrying capacity.
  they have smaller leakage current.
  they have smaller depletion layer.
  they have better ability to dissipate heat.

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Analog Electronics
What is an energy gap?

 Energy level at which an electron can exist
 Energy band in which electrons can move freely
None of these
 Space between two orbital shells

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Analog Electronics
Which of the following amplifier circuit using junction transistor has the best gain?

Common emitter
Common base
Common collector
All have the same gain

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