Power System Analysis 6th AM11 EE2351

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B.E. / B.Tech. Degree Examination, April / May 2011
Sixth Semester
Electrical and Electronics Engineering
EE 2351 – Power System Analysis
(Regulation 2008)

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Part A – (10 × 2 = 20 marks)

1. Draw a simple per-phase model for a cylindrical rotor synchronous machine?
2. What are the advantages of per unit system?
3. What is Jacobian matrix?
4. What is a slack bus?
5. Mention the objectives of short circuit analysis.
6. Write down the balanced and unbalanced faults occurring in a power system.
7. What is sequence network?
8. Write the symmetrical components of a three phase system?
9. Define critical clearing angle.
10. Write swing equation.

Part B – (5 × 16 = 80 marks)

11. (a) (i) With the help of single line diagram, explain the basic components of a power system. (8)
(ii) Write detailed notes about the per-phase model of a three phase transformer. (8)
(OR)
(b) Draw the impedance diagram for the electric power system shown in given figure showing all impedance in per unit on a 100 MVA base.
Choose 20 KV as the voltage base for generator. The tree-phase power and line-lie ratings are given below. (16)
Generator G1: 90 MVA 20 KV X = 9 %
Transformer T1: 80 MVA 20 / 200 KV X = 16 %
Transformer T2: 80 MVA 200 / 20 KV X = 20 %
Generator G2: 90 MVA 18 KV X = 9 %
Line: 200 KV X = 120
Load: 200 KV, S = 48 MW + j64 MVAr

12 (a) With neat flow chart explain the computational procedure for load flow solution using fast decoupled method when the system contains all types of buses.
(OR)
(b) Explain the step by step computational procedure for Gauss-Seidel method of load flow studies.

13 (a) Explain symmetrical fault analysis using Zbus matrix with eat flow chart.
(OR)
(b) A 11 KV, 100 MVA alternator having a sub-transient reactance of 0.25 p.u is supplying a 50 MVA motor having a sub-transient reactance of 0.2 p.u through a transmission line. The line reactance is 0.05 p.u on a base of 100 MVA. The motor is drawing 40 MW at 0.8 p.f leading with a terminal voltage of 10.95 KV when a 3-phase fault occurs at the generator terminals. Calculate the total current in generator and motor under fault condition.

14. (a) What are the assumptions to be made in short circuit studies? Deduces and thaw the sequence network for a line fault at the terminal of an unloaded generator.
(OR)
(b) Two 11 KV, 20 MVA, three phase, star connected generator operate in parallel as shown in given figure the positive, negative and zero sequence reactances of each being, respectively, j0.18, j0.15, j0.10 p.u. The star point of one of the generators is isolated and that of the other is earthed through a 2.0 O resistor. A single line to ground fault occurs at the terminals of one of the generators.
Estimate (i) The fault current
(ii) Current in grounding resistor, and
(iii) The voltage across grounding resistor.

15. (a) Describe the Runge-Kutta method of solution of swing equation for multi-machine systems.
(OR)
(b) Derive an expression for the critical clearing angle and clearing time.

Computer Networks 6th MJ13

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B.E/B.Tech. DEGREE EXAMINATION, MAY/JUNE 2013
Sixth Semester
Electrical and Electronics Engineering
CS 2363/CS 65/10144 CS 503- COMPUTER NETWORKS
(Regulation 2008/2010)

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PART A (10*2=20Marks)

1.Show with an examples how encoding can be done using NRZI technique.
2.What is meant by 1 –persistent CSMA?
3.What are the uses of internetwork routing?
4.What is the purpose of subnetting?
5.List any four QoS parameters.
6.Differentiate flow control from congestion control.
7.Define cryptography.
8.What is meant by PGP?
9.State the advantages of DNS.
10.What are overlay networks?

PART B—(5*16=80MARKS)

11.(a) Discuss in detail on cyclic redundancy check with suitable examples. (16)
Or
(b) Explain in detail the following:
(i) Transparent bridging. (8)
(ii) Source routing bridges. (8)

12. (a) Compare Address Resolution Protocol and RARP. (16)
Or
(b) Write short notes on the following routing:
(i) Shortest path routine. (4)
(ii) Flooding. (4)
(iii) Distance vector routing. (4)
(iv) Flow based routing. (4)

13. (a) Discuss in detail the TCP segment header. Discuss about connection management in TCP. (16)
Or
(b) Explain in detail about various congestion control techniques. (16)

14.(a) Discuss RSA algorithm in detail. (16)
Or
(b) Explain the following :
(i) Authentication based on shared secret key. (8)
(ii) Authentication using a key distribution center. (8)

15. (a) Explain in detail the SNMP model with relevant diagrams. (16)
Or
(b) Discuss the applications of multimedia in audio and video (16)

Principle Of Communication 3rd AM11 IT2202

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B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011
Third Semester
Information Technology
IT 2202 - PRINCIPLES OF COMMUNICATION
(Regulation 2008)

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PART A — (10 × 2 = 20 marks)

1. Define angle modulation.
2. What is percent modulation?
3. Define Quadrature amplitude modulation.
4. State sampling theorem.
5. Compare PCM and DM.
6. Mention two applications of FSK.
7. Define processing gain.
8. What is the difference of multiplexing and multiple accessing?
9. State Keplers law.
10. What are the different types of losses in optical fiber?

PART B — (5 × 16 = 80 marks)

11. (a) (i) Compare AM, FM and PM. (12)
(ii) Write short notes on AM power distribution. (4)
Or
(b) (i) When the modulating frequency in a FM system is 400 Hz and the modulating voltage is 2.4 V. The modulating index is 60. Calculate the maximum frequency deviation. What is the modulation index when modulation frequency is reduced to 250 Hz and modulating voltage is raised to 3.2 V (6)
(ii) (1) Define modulation index of AM, FM and PM. (6)
(2) Define frequency deviation and phase deviation. (4)

12. (a) (i) Explain about the Shannon limit for information capacity. (8)
(ii) Define bit rate, baud rate and bandwidth consideration of FSK. (6)
(iii) Define digital amplitude modulation. (2)
Or
(b) (i) Explain ASK system and discuss its advantages. (8)
(ii) Describe FSK modulator with a neat diagram. (8)

13. (a) Write short notes on :
(i) Adaptive delta modulation. (6)
(ii) Differential pulse code modulation. (6)
(iii) Inter-symbol interference. (4)
Or
(b) (i) Explain the quantization process in PCM. (6)
(ii) Describe the delta modulation system with necessary diagram. (10)

14. (a) (i) Write short notes on direct sequence spread spectrum with coherent BPSK (10)
(ii) Explain about the Pseudorandom sequence. (6)
(b) Explain in detail about the source coding of speech for wireless communications. (16)

15. (a) With a neat diagram, explain briefly about the basic satellite communication systems. Also discuss its applications. (16)
Or
(b) (i) What are the types of optical fiber? Explain. (8)
(ii) Explain briefly about the sources of optical fiber. (8)

HYDROLOGY 6th AM11 CE2021

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Question Paper Code : 11197 421
B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011
Sixth Semester
Civil Engineering
CE 2021 - HYDROLOGY
(Regulation 2008)

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PART A — (10 × 2 = 20 marks)

1. What are the various forms of precipitation?
2. Define Probable Maximum Precipitation.
3. How do you control reservoir evaporation?
4. How do you measure infiltration?
6. What are the limitations of unit hydrograph theory?
5. Define time of concentration.
7. Define Recurrence interval of flood.
8. A flood has a return period of 23 years. What is the Probability exceedance of the flood?
9. Define aquifer.
10. State the limitations of Darcys law.

PART B — (5 × 16 = 80 marks)

11. (a) (i) Explain Hydrologic Cycle with neat sketch. (10)
(ii) What are the various types of precipitation? (6)
Or
(b) (i) How do you measure rainfall? (10)
(ii) Analysis of data on maximum one-day rainfall depth at Chennai indicated that a depth of 280 mm had a return period of 50 years Determine the probability of a one-day rainfall depth equal to or greater than 280 mm at Chennai occurring (1) once in 20 successive years (2) twice in 15 successive Years (6)

12. (a) (i) What are the factors affecting evaporation losses? (6)
(ii) A 6 hr storm produced rainfall intensities of 7, 18, 25, 12, 10 and 3 mm/hr in successive one hour intervals a basin of 800 sq.km. The resulting runoff is observed to be 2640 ha.m. Determine Ø - index for the basin. (10)
Or
(b) How do you measure evaporation Using Pan and Water Budget (16)

13. (a) (i) What are the factors affecting flood hydrograph? Explain. (8)
(ii) In a 4 hr. storm with 50 mm of excess rainfall from a basin, the flows in the stream were as follows :
Time (hrs) : 0 2 4 6 8 12 16 20 Flow (m^3/s) : 0 1.22 4.05 6.75 5.67 3.375 1.35 0
(1) Determine the ordinates of unit hydrograph least once in 20 successive years. (6)
(2) Estimate the peak flow and the time of its occurrence in a flood created by a 8 hr storm, which results in 2.5 cm of effective rainfall during the first 4 hours and 3.75 cm of effective rainfall during the second 4 hours. Assume the base flow as negligible. (2)
Or
(b) (i) State the assumptions in unit hydrograph theory. (6)
(ii) The ordinates of a 4 hr unit hydrograph of a basin of area 300 sq.km. measured at 1 hr intervals are 6, 36. 66.91, 106, 93.79, 68, 58.49, 41, 34, 27, 23, 17, 13, 9,6,3 and 1.5 m^3/s respectively. Determine the ordinates of a 3 hr Unit hydrograph for the basin. (10)

14. (a) (i) How do you determine the magnitude of flood of specific return period using Gumbels method? (6)
(ii) The 50 year and 100 year flood have been estimated to be 660 m^3/s and 740 m^3/s from the available data of annual flood peaks of a small stream for a period of 35 years using Gumbels method. Estimate the 200 year flood in the stream. (10)
Or
(b) (i) Explain briefly about various Flood control measures. (6)
(ii)Reach and derive the outflow hydrographic. The values of K and X for the reach may be taken as 12 hr and 0.278 respectively, time is in hours and flow is in cumecs. (10)
Time 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56
Flow 42 68 116 164 194 200 192 170 150 128 106 88 74 62 54

15. (a) (i) What are the various types of aquifers? Explain. (8)
(ii) How do you determine the Specific Yield using Recuperation Test? (8)
Or
(b) (i) State the assumptions and limitations of Dupuits Theory. (6)
(ii) Route the flood hydrograph given below through a channel well is 40 m before the pumping is started. When pumping is being done at the rate of 3.33 × 10^–2 cumecs, the drawdown in a well 10 m away is 4 m and in another well 20 m away is 2 m. Determine :
(1) Drawdown in the well
(2) Co-efficient of permeability
(3) Drawdown in the well
(4) The maximum rate at which water can be pumped from the well. (10)

Advanced IC Engines 8th MJ2013 ME2041

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Question Paper Code : 21555
B.E./B.Tech. DEGREE EXAMINATION , MAY/JUNE 2013
Eighth Semester
Mechanical Engineering
ME 2041/ME 807 – ADVANCED I.C. ENGINES
(Regulation 2008)

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PART A – (10 X 2 = 20 marks)

1. What is a heterogeneous air-fuel mixture? In which engine is it used?
2. Sketch T-Head type combustion chamber used in S.I engines.
3. Mention any two advantages of induction swirl.
4. What is an indirect-injection type combustion chamber.
5. Why smoke is formed in a CI engine?
6. State the significance of stoichiometric air-fuel mixture.
7. State the methods by which ethanol is produced.
8. Comment on the water tolerance of alcohol blends.
9. What is the working principle of prechamber stratified charge engine?
10. Mention the advantages of plasma ignition system.

PART B – (5 X 16 = 80 marks)

11. (a) (i) Explain the stages of combustion in SI engines elaborating the flame front propagation. (10)
(ii) Explain briefly the various factors that influence the flame speed in S.I. engines. (6)
Or
(b) Describe the requirements of an S.I engine combustion chamber and explain the various types of combustion chamber.

12. (a) With the aid of a schematic diagram , explain the combustion process in a C.I engine.
Or
(b) Explain the factors affecting the delay period in C.I engines and summarize them.

13. (a) (i) Specify the main emissions from a multi-cylinder passenger car C.I engine. How is the air-fuel ratio controlled so as to reduce emissions? (10)
(ii) What is a driving cycle? Discuss its significance with regard to emissions. (6)
Or
(b) (i) Explain the functioning of three way catalytic converter , with a sketch. Mention the limitations of a catalytic converter. (12)
(ii) What are the methods to reduce particulate matter emissions?

14. (a) Compare the properties of gasoline , methanol and ethanol as engine fuels and explain how they influence combustion and emissions?
Or
(b) Discuss the change in properties of alcohol-petrol blends and their effect on the performance of the engine.

15. (a) (i) Describe with a sketches how a CI engine can be controlled electronically. (12)
(ii) What is stratified charge? Give its significance. (4)
Or
(b) (i) Describe the features of homogenous charge compression ignition engine and common rail direct injection engine with neat sketches. (6 + 6)
(ii) Briefly discuss about the necessity of pressure pick , charge amplifier in an IC engine. (4)

Basic Electrical and Electronics Engineering 2nd MJ13

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Reg.No. :
Question Paper Code : 21467
B.E./B.Tech. DEGREE EXAMINATION , MAY/JUNE 2013.
Second Semester
Civil Engineering
GE 2151/EE 26/EE 1153/10133 EE 206/080280011 – BASIC ELECTRICAL AND ELECTRONICS ENGINEERING
(Regulation 2008/2010)

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Manufacturing Engineering , Material Science and Engineering , Mechanical and Automation Engineering , Mechatronics Engineering , Petrochemical Engineering ,
Chemical and Electrochemical Engineering , Petrochemical Technology , Pharmaceutical Technology and Textile Chemistry)

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PART A – (10 X 2 = 20 marks)

1. A 120 resistor has a specified maximum power dissipation of 1 W. Calculate the maximum current level.
2. Three inductive coils each with resistance of 15 and an inductance of 0.03 H are connected in star to a 3Ö 400 V, 50 Hz supply. Calculate the phase voltages.
3. A dc shunt generator supplies a load of 10 kW at 220 V through feeders of resistance 0.1. The resistance of armature and shunt field windings is 0.05 and 100 respectively. Calculate the terminal voltage.
4. In a single phase transformer, Np = 350 turns, Ns = 1050 turns, Ep = 400V. Find Es.
5. Write any two salient points on a p-n junction.
6. When should a transistor be biased? Name two common biasing circuits.
7. Find the following binary difference: 1011010 – 0101110
8. An active high S-R latch has a ‘l’ on S-input and ‘o’ on the ‘R’ input. What state is the latch in?
9. As related to amplitude modulation, what is over-modulation, undermodulation and 100% modulation?
10. Why are digital signals said to be noise immune?

PART B – (5 X 16 = 80 marks)

11. (a) (i) (1) State and explain Kirchoff’s laws. (4)
(2) A Sinusoidal current wave is given by i = 50sin(100Ðt). Determine
the root mean square value. (4)
(ii) Write short notes on moving Iron Measuring Instruments under the
Following headings :
(1) Operating principle. (4)
(2) Classification. (2)
(3) Advantages and disadvantages. (2)
Or
(b) (i) 3 Ö, 200 kW,50 Hz delta connected induction motor is supplied from a 3Ö 440 V, 50 Hz supply system. The efficiency and power factor of 3Ö induction motor are 91% and 0.86 respectively. Calculate :
(1) (A) Current in each motor phase. (2)
(B) Line current (2)
(2) Phasor diagram of the circuit (4)
(ii) Find the current in the 8 resistor in the following circuit using Kirchoff’s Law. (8)