BED Imp Questions unit wise ( 4 , 5 , 6 Units)

MID -II Imp Questions unit wise

              1)      a)What is thermal runaway? Explain it

              b) explain how thermal runaway can be avoided in elf bias circuit ?

              2)      a)explain the operation of IGBT with neat diagrams ?

              b) draw and explain the equivalent circuit of SCR

             3)      a) what are the conditions for oscillations ?

              b) explain amplitude and frequency stability of oscillator ?

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4)      a) Analyze the CE Configuration with H-parameters?

b) What is Q point explain?

5)      Explain Enhancement mode and Depletion mode MOSFET with necessary diagrams?

6)      Explain general characteristics of Negative feedback amplifiers?

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7)      Draw the CB, CE, CC configuration input and output characteristics and explain about leakage current?

8)      Explain JFET characteristics and derive the necessary expressions?

9)      Explain classification of feedback amplifiers?

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10)      a)what are the different current gains in a transistor ? derive the relationship between them 

b) Explain how transistor acts as a switch?

11)      a) Explain with neat diagram SCR characteristics?

b) Compare different types of power devices?

12)      a) Draw the equivalent circuit for crystal oscillator and explain it ?

b) Derive the expression for the frequency of oscillations for RC Phase shift oscillator?