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Analog Electronics

Analog Electronics
The most commonly used semiconductor is

 Carbon
 Silicon
 Germanium
 Sulphur

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

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Analog Electronics
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is

0.25
0.5
1
0.75

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Analog Electronics
The voltage gain of a loaded differential amp is

  large than the unloaded voltage gain.
  equal to RC / re.
  smaller than the unloaded voltage gain.
  impossible to determine.

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Analog Electronics
What is the majority carriers of P type material ?

 Holes
 Protons
None of these
 Electrons

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Analog Electronics
A voltage regulator is a circuit which

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

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