Paper / Subject Code: 30401 / ELECTROMAGNETIC FIELDS ...
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N.B: 1. Question No.1 is compulsory. 2. Answer any three from the remaining five questions. 3. Figures to the right indicate full marks. Q.1 Solve any four:- (20) a) Find a unit vector in cylindrical coordinates pointing from a point in xy plane to a point Q (0,0,z). b) State and explain Ampere's circuital law. c) Derive dielectric –dielectric boundary condition. d) What is Lorents force equation for a moving charge? e) What do you mean by irrotational and solenoidal fields? Q.2 (20) a) A total charge of (40/3) nC is uniformly distributed around a circular ring of radius 2m, Find the potential at a point on the axis 5m from the plane of the ring. b) Point charges Q1 = 300C located at (1,-1,-3) m experiences a force 1 =8 -8 +4 N due to point charge Q2at (3,-3,-2) m. Determine Q2. Q.3 (20) a) Derive an electric field intensity due to infinite line charge. b) Given that D 5 2 4 in spherical coordinates, evaluate both sides of the divergence theorem for the volume enclosed between r=1 and r=2. Q.4 (20) a) In a cylindrical conductor of redius 2mm, the current density varies with distance from the axis according to J = 10 3 400(/ 2 ). Find the total current. b) V = 0volts for r=0.1m and V = 100volts for r = 2m in spherical co-ordinates assuming free space between the concentric spherical shells. Find ̇ ̇ using Laplace’s equation. Q.5 (20) a) Derive magnetic field intensity due to infinite wire carrying a current I. b) Given = 0 2 − in free space .Determine if there exists a magnetic field such that both Faraday's law and ampere's circuital law are satisfied simultaneously. Q.6 (20) a) Derive the wave equation for electric field and magnetic field in free space. b) Calculate the intrinsic impedance ,propagation constant and the wave velocity for a conducting medium in which = 58 , = 1, at a frequency f=100MHz ********* Paper / Subject Code: 30401 / ELECTROMAGNETIC FIELDS & WAVES 9B3F1078C11C9DB7CE7FD07066644156
Transcript of Paper / Subject Code: 30401 / ELECTROMAGNETIC FIELDS ...
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55594 Page 1 of 1
[Time: 3 Hours] [ Marks:80]
Please check whether you have got the right question paper.
N.B: 1. Question No.1 is compulsory.
2. Answer any three from the remaining five questions.
3. Figures to the right indicate full marks.
Q.1 Solve any four:- (20)
a) Find a unit vector in cylindrical coordinates pointing from a point in xy plane to a point Q
(0,0,z).
b) State and explain Ampere's circuital law.
c) Derive dielectric –dielectric boundary condition.
d) What is Lorents force equation for a moving charge?
e) What do you mean by irrotational and solenoidal fields?
Q.2 (20)
a) A total charge of (40/3) nC is uniformly distributed around a circular ring of radius 2m,
Find the potential at a point on the axis 5m from the plane of the ring.
b) Point charges Q1 = 300𝜇C located at (1,-1,-3) m experiences a force
�̂�1=8�̂�𝑥-8 �̂�𝑥+4�̂�𝑥 N due to point charge Q2at (3,-3,-2) m.
Determine Q2.
Q.3 (20)
a) Derive an electric field intensity due to infinite line charge.
b) Given that D̅ 5𝑟2
4𝑎𝑟̅̅̅̅ in spherical coordinates, evaluate both sides of the divergence theorem
for the volume enclosed between r=1 and r=2.
Q.4 (20)
a) In a cylindrical conductor of redius 2mm, the current density varies with distance from
the axis according to J = 103400𝜌(𝐴/𝑚2). Find the total current.
b) V = 0volts for r=0.1m and V = 100volts for r = 2m in spherical co-ordinates assuming
free space between the concentric spherical shells. Find �̇� 𝑎𝑛𝑑 �̇� using Laplace’s
equation.
Q.5 (20)
a) Derive magnetic field intensity due to infinite wire carrying a current I.
b) Given �̅� = 𝐸0𝑧2𝑒−𝑡�̂�𝑥 in free space .Determine if there exists a magnetic field such that
both Faraday's law and ampere's circuital law are satisfied simultaneously.
Q.6 (20)
a) Derive the wave equation for electric field and magnetic field in free space.
b) Calculate the intrinsic impedance ,propagation constant and the wave velocity for a
conducting medium in which 𝜎 = 58𝑀𝑠
𝑚, 𝜇𝑟 = 1, at a frequency f=100MHz
*********
Paper / Subject Code: 30401 / ELECTROMAGNETIC FIELDS & WAVES
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69339 Page 1 of 1
Time: 3 Hours Total Marks: 80
Note-
a) Question No. 1 is compulsory
b) Attempt any 3 question remaining five
c) Assume Suitable Data If Required
Q1.Attempt any four each question Carry Equal Marks (20)
a) Explain the need of parallel operation of transformer and write the necessary condition for
parallel operation of 3 phase transformer
b) Explain Double revolving field theory.
c) Draw and Explain connection and phasor diagram of Dy 11 and Yy6.
d) Explain Cogging And Crawling Phenomenon In 3 Phase Induction Motor.
e) Explain similarity between three phase transformers and induction Why induction motor is
called generalized transformer
Q2. a) Explain Oscillating neutral phenomenon in three phase transformers. Remedies to overcome
this phenomenon (10)
b) A 500-kVA transformer with 0.012 PU resistance and 0.06PU reactance, is connected in parallel
with a 250-kVA transformer with 0.014 PU resistance and 0.045 PU reactance to share a load of 600
kVA at 0.8 power factor lagging. Find the KVA and power factor shared by each transformer. Do
write the necessary formula utilized to solve the numerical (10)
Q3.a) Draw and explain working of star-delta starter for three phase induction motor also derive
expression for starting current and starting torque. (10)
b) A 3 phase star connected 400V, 50 Hz, 4 pole induction motor has the following per phase constant
referred to stator R1 = 0.15, X1=0.45, R2=0.12 X2=0.45 Xm=28.5Fixed losses (core and friction and
windage losses) =400w. Calculate stator current, rotor speed, output torque and efficiency when
motor is operated at rated voltage and frequency at a slip of 4%.
Q4.a) Discuss V/F speed control method of three phase induction motor (10)
b). Draw and Write all the steps and draw circle diagram. Take suitable example to draw circle
diagram (10)
Q5. a) Draw and explain power stage of 3 phase induction motor and drive the equation for output
power. (10)
b) Draw and explain the working of capacitor start capacitor run induction motor along with
application. (10)
Q6.Short notes(attempt any 2) (20)
a) Induction Generator
b) Switching in transient phenomenon
c) Scott connection
____________________________
Paper / Subject Code: 30402 / ELECTRICAL MACHINE II
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58815
(Time: 3 Hours) [Total marks: 80]
N.B:- (1) Question 1 is compulsory
(2) Solve any three questions from remaining five questions.
(3) Figures to the right indicate full marks.
Q 1. Answer the following questions. 20
A) Draw single line diagram and show all substation devices.
B) Write advantages and disadvantages of static relay.
C) What do you mean by resistance switching
D) What is the use of instrument transformer in power system
Q 2 a) Explain protection provided for Radial, Ring Main, and parallel Feeder of
transmission Line 10
Q 2 b) Write a short note on different types of fuses 10
Q 3 a) What do you understand by single phasing in induction motor. How motor is
protected from single Phasing? 10
Q 3 b) Explain with the help of neat sketch construction and working of SF6 circuit
breaker 10
Q 4 a) Explain the high resistance and low resistance method of arc quenching. 10
Q 4 b) Explain construction, working principle of an induction disc type relay with neat
sketch 10
Q 5 a) Explain REF protection for alternator. How 100% winding is protected in an
alternator 10
Q 5 b) What are the desirable qualities of protective relaying 10
Q 6 a) Differentiate between different types of distance relays. 10
Q 6 b) Explain biased differential protection for transformer protection in detail 10
---------------------------------------------------------------------------------------------------------------------------------
Paper / Subject Code: 30403 / PROTECTION AND SWITCH GEAR ENGINEERING
17E36DB05955128D9E32F0CE5FA5F1F4
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68414 Page 1 of 1
(Time: 3 Hours) [Total Marks: 80]
N.B: (1) Question No.1 is compulsory.
(2) Answer any three from remaining five questions.
(3) Figures to the right indicate full marks.
(4) Assume the data if it is necessary.
1. Attempt any four of the following. [20]
(a) Explain the need of modulation communication system.
(b) Explain Shannon’s Theorem on channel capacity.
(c) Draw ASK, FSK, PSK waveforms for data bit sequence 10101011.
(d) Explain the significance of modulation index in communication system.
(e) Explain the role of AGC in AM reception.
2. (a) Consider a (7,3) code whose Parity check matrix is given below. [10]
H = 0 1 1 1 0 0 0
1 0 1 0 1 0 0
1 1 0 0 0 1 0
1 1 1 0 0 0 1
(i) Construct syndrome table for signal bit error patterns.
(ii) Decode the received code vector R1=0011101, R2= 1101110.
(b) Explain a method of generating SSB-SC AM signal with the help of waveforms. [10]
3.(a) Explain DM transmitter and receiver with the help of neat block diagram. [10]
(b) In a fax transmission of a picture there are 2.25*106
picture elements in a frame.12
brightness levels are required for faithful reception. Assuming all these levels are
equiprobable, calculate channel bandwidth required to transmit 1 picture in every 3
minutes for a signal to noise ratio of 30dB. If signal to ratio is increased to 40 dB.
Calculate new bandwidth. Comment on SNR-BW Trade of for the results obtained in
above cases. [10]
4. (a) Derive AM wave equation, plot frequency spectrum of AM wave. [10]
(b) Explain regarding B PSK (i) Transmission (ii) Reception (iii) waveform for data
bit sequence b(t) = 1011001. Also plot frequency spectrum . [10]
5. (a) The Generator Polynomial of a (7,4) cyclic code is g(x) = 1+x2+x
3. Draw feedback
shift encoder. Use this encoder to find code word for the message
(0011) in systematic form. [08]
(b) What is Direct and Indirect method of FM generation? Also Explain Armstrong
method of FM generation. [12]
6. Write short notes on (any two) [20]
(a) Quantization in pcm system.
(b) OFC Communication.
(c) Convolution codes.
(d) Superhetrodyne reciever
*******************
Paper / Subject Code: 30404 / COMMUNICATION ENGINEERING
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Q.P.Code: 39123 (3 Hours) [Total Marks: 80]
N.B: (1) Question No.1 is compulsory.
(2) Answer any three from remaining five questions.
(3) Figures to the right indicate full marks.
(4) Assume the data if it is necessary. 1. (a) Draw and explain the block diagram of Digital communication system. [20]
(b) Explain with block diagram Power Line Carrier Communication.
(c) Explain Nyquist criteria for sampling theorem
(d) Explain how Power and Bandwidth saving is achieved using SSB system.
2. For a systematic linear block code, the three parity check digits C4,C5 and C6 are given by:
𝐶4=d1⊕d2⊕d3
𝐶5=d1⊕d2
𝐶6=d1⊕d3
(a) Construct generator matrix.
(b) Construct all possible codes generated by this matrix.
(c) Determine the error correcting capability.
(d) Prepare a suitable decoding table and Decode the received words 101100 and 000110. [10]
(b) Derive AM wave equation and also explain a method for SSB generation of AM. [10]
3. (a) What is quantization and quantization noise. [10]
(b)Compute Huffman code and calculate code efficiency for the following. [10]
Symbol S0 S1 S2 S3 S4 S5 S6
Probabilities 0.25 0.25 0.125 0.125 0.125 0.0625 0.0625
4. (a) Explain the functioning of Foster-Seeley Discriminator for FM detection with neat circuit
diagram and phase diagrams. [10]
(b) Explain regarding DPSK (i) Transmission (ii) Reception (iii) waveform for data bit sequence
b(t) = 1011001 [10]
5. (a) The Generator Polynomial of a (7,4) cyclic code is x3+x+1.
(i) Implement the Encoder.
(ii) Using the Encoder determine the codeword for D = 0011 [05]
(b) Explain the need for channel coding and state various types of channel coding. [05]
(c) The Antenna current of an AM Transmitter is 10 Amps when it is modulated to a depth of 30%
by an audio signal. It increases to 11 Amps when another signal modulates the carrier. What is
modulation index due to second wave . [10]
6. Write short notes on (any two) [20]
(a) Fourier Transform and its properties.
(c) Convolution codes.
(d) Delta modulation.
_____________________
Paper / Subject Code: 30404 / COMMUNICATION ENGINEERING
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70824
(Time: 3 Hours) [Total Marks: 80]
N.B.: (1) Question No. 1 is compulsory.
(2) Answer any three from the remaining five questions.
(3) Assume suitable data if necessary and justify the same.
(4) Figures to the right indicate the marks.
1. (a) What is DC-DC converter? List few applications of it. [5]
(b) Briefly explain Latching current and Holding current. [5] (c) Two transmitter analogy of SCR. [5] (d) Once SCR is triggered gate loses its control. Why? [5]
2. (a) Define and explain any two communication circuits of SCR. [10]
(b) Explain the operation of a single phase full wave rectifier with RL load for
continuous and discontinuous load. [10]
3. (a) Draw a neat circuit and explain the working of full wave fully controlled 3phase
bridge circuit with resistive load. Draw the corresponding input and output voltage
waveforms.
[10]
(b) Explain with circuit diagram and waveform of 1- phase dual converter. [10]
4. (a) Draw and Explain 3 phase inverter where 3 switches conduct together also do the
calculation of output voltage. [10]
(b) Define and explain a 1-phase Inverter with RL Load along with output voltage and
output current wave forms and also obtained the expression. [10]
5. (a) Explain the step down chopper with and without CCM Mode. [10]
(b) A BOOST Converter has input voltage 6V. The average output voltage E0=18 V and
the average load current I0=0.4A. The switching frequency is 20 kHz of L=250 H
and C=420F. Determine: (a) the duty cycle , (b) the ripple current of inductor, ΔI,
(c) the peak current of inductor, I2, and (d) the ripple voltage of filter capacitor, ΔVc.
[10]
6. (a) Explain in detail with circuit diagram and waveforms, single phase step down
cycloconverter. [10]
(b) Explain the principle of ON OFF control of AC voltage controller. [10]
******************
Paper / Subject Code: 30405 / POWER ELECTRONICS
F7E649C70D8E689B45C1F2EDB66395C0
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