paper / subject code: 49601 / analog electronics - i ... old se extc.pdf · d write down current...

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Page 1: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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69711 Page 1 of 2

Duration: 3hrs Max. Marks: 80

N.B. : (1) Question No. 1 is compulsory.

(2) Solve any three questions from the remaining five

(3) Figures to the right indicate full marks

(4) Assume suitable data if necessary and mention the same in answer sheet.

Q

No.1

Attempt any 5 questions

a Compare Depletion and Enhancement MOSFET. 5

b Why LC oscillators are preferred for high frequency applications. 5

c Draw small signal model of JFET & explain each parameter. 5

d Write down current equation of diode and explain significance of each

parameters. 5

e State and explain Barkhausen’s criteria for oscillations. 5

f Find Q point for the following circuit shown in fig.1. Assume β=100 and

VBE=0.6V

Fig.1 Fig.2

5

Q

No.2

a Explain the working of wein bridge oscillator and derive the expression for

frequency of oscillation. 10

b Derive the expression for voltage gain, Current gain, Input impedance and

output impedance for bypassed voltage divider CE BJT amplifier. 10

Q

No.3

a Explain Construction and operation of varactor diode. 10

b For JFET amplifier shown in fig.2, find Av, Ri, Ro. Assume FET

parameters: IDSS=8mA, VP= -3V, rd =100kΩ

10

Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I

52D665BA610210D6637CEC2F49DDD1EF

Page 2: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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69711 Page 2 of 2

Q

No.4

a Determine Av, Ai, Ri, Ro for unbypassed BJT amplifier shownin fig.3.

Assume β=120 and VBE=0.6V.

Fig.3 Fig.4

10

b For the circuit shown in fig.4 Determine voltage gain, Input and output

impedance. Assume β=120 and VBE=0.7V. 10

Q

No.5

a For MOSFET amplifier shown fig 5 . Determine Av, Zi, Zo . Assume

MOSFET DATA: KN = 1 MA/v2 , VTN = 0.7 v

(10 M)

Fig.5

b Define stability factor. Derive the expression for stability factor of voltage

divider bias. Explain which biasing technique is more stable.

Q

No.6

Write short notes on (any Two)

a D.C. load line & significance of Q pt. 10

b Clipping Circuit 10

e Comparison of BJT CE & JFET CS Amplifier 10

*****************

Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I

52D665BA610210D6637CEC2F49DDD1EF

Page 3: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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Page 1 of 2

( 3 Hours) [ Total marks : 80

Note : - 1) Question number 1 is compulsory.

2) Attempt any three questions from the remaining five questions.

3) Figures to the right indicate full marks.

Q.1 a) Find the Laplace transform of 𝑠𝑖𝑛ℎ5𝑡.

05

b) Find an analytic function whose imaginary part is

𝑒−𝑥(𝑦 cos 𝑦 − 𝑥𝑠𝑖𝑛 𝑦).

05

c) Find the Fourier series for 𝑓(𝑥) = 1 − 𝑥2 in (−1, 1).

05

d) Evaluate ∫ ∙ 𝑑

𝐶 where = 2𝑥 𝑖 + (𝑥𝑧 − 𝑦) 𝑗 + 2𝑧 𝑘 from

𝑂(0, 0, 0) to 𝑃(3, 1, 2) along the line 𝑂𝑃.

05

Q.2 a) Find a cosine series of period 2𝜋 to represent sin 𝑥 in 0 ≤ 𝑥 ≤ 𝜋.

06

b) Find 𝑎, 𝑏, 𝑐 if = (𝑎𝑥𝑦 + 𝑏𝑧3) 𝑖 + (3𝑥2 − 𝑐𝑧) 𝑗 + (3𝑥𝑧2 − 𝑦) 𝑘 is irrotational.

06

c) Find the image of the circle |𝑧| = 𝑘 where 𝑘 is real under the bilinear

transformation 𝑤 =5−4𝑧

4𝑧−3.

08

Q. 3 a) Prove that 𝐽1

2

(𝑥) = tan 𝑥 ∙ 𝐽−

1

2

(𝑥).

06

b) Find the inverse Laplace transform of the following function by

convolution theorem (𝑠+2)2

(𝑠2+4𝑠+8)2.

06

c) Obtain the complex form of Fourier series for 𝑓(𝑥) = 𝑒𝑎𝑥 in (−𝑙, 𝑙)

where 𝑎 is not an integer.

08

Q. 4 a) Find the angle between the normals to the surface 𝑥𝑦 = 𝑧2 at the points

(1, 4, 2) and (−3, −3, 3).

06

b) Prove that

𝑥2 𝐽𝑛′′(𝑥) = (𝑛2 − 𝑛 − 𝑥2) 𝐽𝑛(𝑥) + 𝑥 𝐽𝑛+1(𝑥);

𝑛 = 0, 1, 2, ……

06

Paper / Subject Code: 49402 / APPLIED Â MATHEMATICS III

5E3DE25E6A27B8E7164E07E6059DCC05

Page 4: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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Page 2 of 2

c)

(i)

Find the Laplace transform of 𝑠𝑖𝑛ℎ𝑎𝑡 sin 𝑎𝑡.

04

(ii) Find the Laplace transform of 𝑡𝑒−4𝑡 sin 3𝑡.

04

Q. 5 a) Prove that 𝐽2(𝑥) = 𝐽′′

0(𝑥) −

𝐽0′(𝑥)

𝑥.

06

b) If 𝑣 = 𝑒𝑥 sin 𝑦 , show that 𝑣 is harmonic and find the corresponding

analytic function.

06

c) Find the Fourier series for 𝑓(𝑥) in (0, 2𝜋),

𝑓(𝑥) = 𝑥, 0 < 𝑥 ≤ 𝜋

2𝜋 − 𝑥, 𝜋 ≤ 𝑥 < 2𝜋

Hence, deduce that 𝜋4

96=

1

14+

1

34+

1

54+……..

08

Q. 6 a) Show that the set of functions cos 𝑛𝑥, 𝑛 = 1, 2, 3, ….. is orthogonal

on (0, 2𝜋).

06

b) Using Green’s theorem evaluate ∫ ∙ 𝑑

𝐶 where 𝐶 is the curve

enclosing the region bounded by 𝑦2 = 4𝑎𝑥, 𝑥 = 𝑎 in the plane 𝑧 = 0

and

= (2𝑥2𝑦 + 3𝑧2) 𝑖 + (𝑥2 + 4𝑦𝑧) 𝑗 + (2𝑦2 + 6𝑥𝑧) 𝑘.

06

c) Use Laplace transform to solve

𝑑2𝑦

𝑑𝑡2+ 4

𝑑𝑦

𝑑𝑡+ 8𝑦 = 1 with 𝑦(0) = 0, 𝑦′(0) = 1.

08

*********

Paper / Subject Code: 49402 / APPLIED Â MATHEMATICS III

5E3DE25E6A27B8E7164E07E6059DCC05

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758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

AC31

A4B

895B

758F

BB7500

71CA

0652

DCA

69993

Time: 3 Hours Marks: 80

N.B:

(1) Attempt four questions, question no:1 is Compulsory.

(2) Assume suitable data wherever required.

(3) Answers to the questions should be grouped together.

(4) Figure to the right of question indicates full marks.

1) Attempt any four: 20

(a) List names of bridges for RLC measurement with proper classification

(b) Write a note on piezoelectric transducer.

(c) Compare Analog instrument with digital instrument.

(d) Define accuracy, precision and sensitivity with suitable example

(e) What is cold junction compensation in thermocouples

(f) Describe the various types of sweeps used in CRO

2 (a) Explain the components of analog data acquisition system. 10

(b) Explain Kelvin’s double bridge and its application in very low resistance measurement. 10

3. (a) Draw and explain R-2R ladder network DAC for 3 bits input taking suitable example. 10

(b) Draw neat block diagram of Dual Beam oscilloscope. Give the comparison between Dual

Trace and Dual Beam Oscilloscope. 10

4. (a) Explain SAR or Flash type ADC with the help of block diagram and comment on its speed.

10

(b) Define Q factor and explain working of a Q meter for Q factor measurement 10

5. (a) Explain electrodynamometer type wattmeter. 10

.

(b) Draw and discuss Maxwell bridge and its applications for measurement of Inductance 10

6. (a) Draw and discuss Hey Bridge and its application for measurement of inductance. 10

(b) Explain Heterodyne type wave analyser and its applications 10

...............................................................................

Paper / Subject Code: 49604 / ELECTRONIC INSTRUMENTS & MESUREMENTS

AC31A4B895B758FBB750071CA0652DCA

Page 6: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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71738 Page 1 of 4

Time: 3 Hours Total Marks: 80

N.B.

1) Question No. 1 is Compulsory

2) Out of remaining questions, attempt any three

3) Assume suitable data if required

4) Figures to the right indicate full marks

1 (A) Draw equivalent circuit for given magnetically coupled circuit.

I

j5

1 2I

+

K = 0 .8 j10

53

50 0

–j4

o pV

05

(B) In the network shown in Fig., at t = 0, switch is opened. Calculate v,

dv

dt at t =

0+.

1001 A 1 H

v (t)

05

(C) The Z parameters of a 2 port network are, Z11 = 20 , Z22 = 30 , Z12 = Z21 =

10 . Find Y parameters.

05

(D) Two two port networks are connected in parallel. Prove that the sum of the

corresponding individual parameters is equal to the overall y parameters.

05

Paper / Subject Code: 49605 / CIRCUITS AND TRANSMISSION LINES

85A55AA012BBCD63B826DE55CD875E89

Page 7: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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71738 Page 2 of 4

2 (A) The network of Fig. is under steady state with switch at position 1. At t = 0,

switch is moved to position 2. Find i (t).

i (t)

50 V

1

2

10 V

40

20 mH

10

(B) The Z-parameters of a two port are : Z11 = 20 , Z12 = Z21 = 10 , Z22 = 30 .

Find equivalent T-network.

VV

+

21

21I I

+Z1 Z 3

2Z

10

3 (A) Determine Thevenin’s equivalent network for the Fig. shown.

+ –10 I

x5 10

x 10 V

1 A I

10

(B) The parameters of a transmission lines are R = 65Ω/km, L=1.6mH/km, G = 2.25

mmho/km, C=0.1µF/km. Find

i) Characteristic Impedance

10

Paper / Subject Code: 49605 / CIRCUITS AND TRANSMISSION LINES

85A55AA012BBCD63B826DE55CD875E89

Page 8: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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71738 Page 3 of 4

ii) Propagation Constant

iii) Attenuation Constant

iv) Phase Constant at 1 kHz

4 (A) Determine whether following functions are positive real

i) s4 + 2s3 + 3s2 + 1

s4 + s3 + 3s2 + 2s + 1

ii) s2 + 2ss2 + 1

10

(B) In the network of Fig. find V0.

0 V po10

2

j2 V0j2 j2

2 2

+

+

10

5 (A) Find Y-parameters for the network shown in Fig

1

+

V

+

V2

I1 2I

1

0.5

2

0.5

2

0.5

10

(B) Realize the following functions in Foster I and Foster II form

F (s) = 4 (s + 1) (s + 3)(s + 2) (s + 6)

10

Paper / Subject Code: 49605 / CIRCUITS AND TRANSMISSION LINES

85A55AA012BBCD63B826DE55CD875E89

Page 9: Paper / Subject Code: 49601 / ANALOG ELECTRONICS - I ... OLD SE EXTC.pdf · d Write down current equation of diode and explain significance of each parameters. 5 e State and explain

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71738 Page 4 of 4

6 (A) A transmission line has a characteristics impedance of 50 ohm and terminate

in a load ZL= 25 + j50 ohm. Use smith chart and Find VSWR and Reflection

coefficient at the load.

10

(B)

The switch in Fig. is open for a long time and closes at t = 0. Determine i (t)

for t > 0.

30 2 H24 0 V

6 3

i (t)

10

******************

Paper / Subject Code: 49605 / CIRCUITS AND TRANSMISSION LINES

85A55AA012BBCD63B826DE55CD875E89