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Important Questions for "Oscillations":

[1]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. Convert octal number (24) to binary equivalent.
  3. What are Power Amplifiers? Write down the difference between Voltage and Power Amplifiers. Explain the working of class A power amplifier with suitable circuit diagram and output characteristic curve.

[2]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. Draw the circuit of R-C coupled CE amplifier and explain its frequency response curve at different frequency ranges. Why does the gain decrease in low and high frequency ranges?
  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. Explain the Kronig-Penny model. Derive the equation for the energy of an electron in one-dimensional periodic potential.
  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. The unit of h-parameter is mho.
  3. A certain D-MOSFET biased at V_GS=0V has a specified I_DSS=20mA and V_P=-5V. What is the value of drain current?

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