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Time: 3 hrs.
Max. Marks: Note: Answer FIVEfull questions, selecting at least TWO questions from each part.
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PART-A 1
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a. ExPl.~inthe criteria for selecting a suitable operating point and factors affe6tjng the stability.
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(08 Marks)
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the operating point for a fixed bias circuit shown in Fig.QJ~~:itiven p = 100 and
raw the loadline.
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(07 Marks) (05 Marks)
c. Explain transistor as a switch.
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a. Explain the classi on of optoelectronic devices. b. Define the fol g terms: i) Respo . ii) NEP c. iii) Res ime iv) Quantum efficiency Expla' working of cathode ray tube with a neat diagram. Wha di tages of CRT?
(06 Marks)
(04 Marks) tpe advantages and / (10 Marks) J
,
J0What is the need for cascading amplifier? Explain two stage cascaded amplifier)-V\tha block , ?"
diagram.
ii) Input impedance
iii) Voltage gain
5
-
'-'.(Q~Marks)
Derive the expressions for: i) Current gain
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(06 Marks) (04 Marks) 'on of an n-channel JFET.(10 Marks)
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4
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a. What are the differences betwee't¥13JTsand b. Explain the working of a C0"S inverter. c. Explain the constructiOl,,~brking and principle o('bp
iv) Output admittance
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(12 iV~rks)
PART-B a. Briefly explain the classification of amplifier based on input and output parameter of interest [Vi, Va, Ii and 10], (12 Marks) b. With a neat block diagram, explain amplifier with negative feed back. (04 Marks) c. Calculate the values of harmonic distortion components for an output signal having an amplitude of 5V at fundamental frequency, second harmonic component of 0.5V, third harmonic component of O.2V and fourth harmonic component of 0.05V and find total harmonic distortion. (04 Marks)
10f2
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a. What are necessary conditions for loop gain and phase shift for sustained oscillations according to Barkhausen criterion? (04Marks) b. Explain the working of an Astable multivibrator using IC 555 timer with circuit diagram and relevant waveforms. (08Ma,.!
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Explain the steps involved in custom design of mains transformer. b. ())lliat are SMPS? Compare linear power supplies with SMPS. c.BlEYr'~tinthe working of three terminal voltage regulators. 8
(06 Marks) (07 Marks) (07 Marks)
a. ~at s~ e the sle.wrat~ cho~sen ~oran.OPAM.Pas an inve{ti~)wamplifierconfigu:ation wIth gaIn 0 ,AvhenInput ISa sInusoIdal sIgnal wIth peak tO~~l{ value of 2V and hIghest frequencyexpe is 50 Hz? (04 Marks) b. Explain the worki § an OPAMP window comparator w}t,)circuit diagram. (08Marks)
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c.
Explain the lead an~g,type
of phase shifter. * * *
{tc'kg 'W'
(08 Marks)
