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E B3E037 Pages:3
PART ^
(Answer ANY THREE questions)
8. State and explain Barkhausen criteria for sustained oscillation. (4)
9. Explain the effect of cascading on amplificr's gain and bandwidth. (4)
10. Briefly describe the working of a Hartley oscillator. (4)
11. Explain the effect of negative feedback on amplifier. (4)
PART 0

(Answer ANY TWO questions)
12. (i) With neat diagram,explain the working principle of Wien bridge oscillator using BJT.

(5)

(ii)Derive the expression for the frequency of oscillation of Wien bridge oscillator using
BJT. (4)
13. (1) Sketch and explain the frequency response of an RC coupled amplifier (4)
(ii) With neat diagram,explain the working of astable multivirator using BJT. (5)

14. (i)Explain Potential divider biasi > transistor in Common Emitter configuration with

ತಾಃ
^ (4)
ential divider bias configuration in
Common emitter mode with ‏ک۷‎ 151,۱۸۷۶ ۰ 1.२ 12 ಓಣ, Re= 11೧ ௩

1.2kQ and. Calculate biasing current Ic,Ip,Iz and voltages Vc, Ve,V ce. (5)

necessary equations.

(11) A transistor with [नाण 50 ١

PARTE
(Answer ANY FOUR questions)

15. (1) List out the ideal characteristics of an OP-AMP. What are their typical values for
1741 OP-AMP. (5)
(ii)With neat diagram,explain the working and transfer characteristics of a non-inverting
Schmitt trigger using OP-AMP. (5)

16. (1) With necessary equations explain the working of an integrator circuit using OP-AMP
for a square wave input with period T. (5)
(ii) What do you mean by differential amplifier? With neat sketches, explain the working
of an open loop OP-AMP differential amplifier. (5)

17. (i) Explain the working of Summing amplifier and subtractor circuit using OP-AMP. (3)
(ii)Design a summing amplifier circuit using OP-AMP to yield Vp = —V, + 2४2 - 31.

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