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Important Questions for "Oscillations":

[1]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. Discuss the Fermi level in intrinsic and extrinsic semiconductors.
  3. Calculate the barrier capacitance of p-n junction diode made of Germanium having area 1 um and thickness 100 nm. The dielectric constant of Germanium is 16.

[2]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. Explain the depletion layer in p-n junction diode with suitable diagram.
  3. What is MOSFET? Explain the construction and working of depletion type and enhancement type of MOSFET with their respective characteristic curves.

[3]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. Write a short note on emitter follower circuit.
  3. What is MOSFET? Explain the construction and working of depletion type and enhancement type of MOSFET with their respective characteristic curves.

[4]

  1. Barkhausen criterion for sustained oscillations states that A=1.
  2. Ripple factor of a half-wave rectifier is 1.21.
  3. A Wien bridge oscillator uses both positive and negative feedback.

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