## Electrical Machines I 4th ND11 EE2251

Posted by Varuna V on 6:04 PM

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.
Fourth Semester
Electrical and Electronics Engineering
EE 2251 - ELECTRICAL MACHINES - I
(Regulation 2008)

PART A — (10 × 2 = 20 marks)

1. Define statically and dynamically induced EMF.
2. What is Hysteresis loss and how can this loss be minimized?
3. Why is transformer rated in KVA?
4. Compare two winding transformer and auto transformer.
5. What are the advantages of analyzing energy conversion devises by field energy concept?
6. Draw the general block diagram of electromechanical energy conversion device.
7. What is back EMF in a D.C. motor?
8. Define winding factor.
9. What is armature reaction in DC machines?
10. Explain why Swinburne’s test cannot be performed on DC series motor.

PART B — (5 × 16 = 80 marks)

11. (a) Compare electric and magnetic circuit by their similarities and dissimilarities. (16)
Or
(b) A ring composed of three sections. The cross section area is 0.001 m2 for each section. The mean arc length are Ia = 0.3 m, Ib,= 0.2 m, Ic = 0.1 m. an air gap length of 0.1 mm is cut in the ring. r ยต for sections a, b and c are 5000, 1000 and 10000 respectively. Flux in the air gap is 7.5 × 10–4 Wb. Find (i) mmf (ii) exciting current if the coil has 100 turns (iii) reluctance of the sections. (16)

12. (a) (i) Explain clearly the causes of voltage drop in a power transformer on load and develop the equivalent circuit for a single phase transformer. (10)
(ii) Derive an expression for saving of copper when an auto transformer is used. (6)
Or
(b) A 3-phase step down transformer is connected to 6.6 KV mains and takes 10 Amps. Calculate the secondary line voltage and line current for the (i)   (ii) Y Y (iii)  Y and (iv) Y  connections. The ratio of turns per phase is 12 and neglect no load losses. (16)

13. (a) Obtain an expression for the mechanical force of field origin in a typical attracted armature relay. (16)
Or
(b) Find an expression for the magnetic force developed in a doubly excited magnetic systems. (16)

14. (a) Derive an expression for emf generated in
(i) Synchronous machine (8)
(ii) D.C machine. (8)
Or
(b) A 3F, 50 Hz, star connected alternator with two layer winding is running at 600 rpm. It has 12 turns/ coil, 4 slots/pole/phase and a coil pitch of 10 slots. If the flux per pole is 0.035 Wb sinusoidally
distributed, Find the phase and line emf induced. Assume that the total turns/phase are series connected. (16)

15. (a) Explain the different methods of excitation and characteristics of a DC motors with suitable diagrams. (16)
Or
(b) Explain the Ward-Leonard system of controlling the speed of a DC shunt motor with help of neat diagram. (16)

## Applied Geology 3rd ND09 AG2211

Posted by Varuna V on 5:49 PM

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Third Semester
Civil Engineering
AG 2211 - APPLIED GEOLOGY
(Regulation 2008)
Use neat sketches wherever necessary

PART A — (10 × 2 = 20 Marks)

1. Give a brief account of the Earth’s interior.
2. What are the effects of weathering on the engineering properties of rocks?
3. Write the chemical composition, physical properties and uses of Calcite.
4. List the properties of petroleum bearing reservoir rocks.
5. Write about the mineral composition, origin and properties and uses of basalt.
6. Bring out the differences between dolerite and pegmatite.
7. Briefly describe Dip and Strike of rocks use a neat diagram.
8. What is the difference between the Wenner and Schlumberger methods?
9. Define the terms ‘overlap’ and ‘parallax’.
10. Give the functions of a breakwater.

PART B — (5 × 16 = 80 Marks)

11. (a) Explain the work of a river and describe the various erosional and depositional landforms created by a river.
Or
(b) How are earthquakes caused? Give an account of the earthquake belts in India.

12. (a) Give a detailed account of the chemical composition, physical properties, origin, occurrence, engineering behaviour and uses of the clay minerals.
Or
(b) Describe the varieties, composition, properties, origin & Indian occurrences of coal.

13. (a) Describe the mineral composition, texture, origin, engineering properties and uses of Granite, Limestone, Quartzite and Schist.
Or
(b) List the various laboratory and field tests to be carried out to determine the engineering properties of rocks.

14. (a) Classify folds and faults in rocks and explain how they influence the design of dams.
Or
(b) Write an elaborate account of the seismic methods of investigation in civil engineering.

15. (a) Classify aerial photographs and explain in detail their role in civil engineering surveys.
Or
(b) Give a detailed account of the types of landslides, the causative factors and the methods to prevent landslides.

## Strenght Of Material 4th AM10 CE2252

Posted by Varuna V on 5:40 PM

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010
Fourth Semester
Civil Engineering
CE2252 - STRENGTH OF MATERIALS
(Regulation 2008)

PART A — (10 × 2 = 20 Marks)

1. A beam of span 4 m is cantilever and subjected to a concentrated load 10 kN at free end. Find the total strain energy stored. Take the Flexural rigidity is EI.
2. Write down Maxwell’s reciprocal theorem.
3. A fixed beam of span ‘L’ is subjected to UDL throughout w/m. What is end moments and moment at the centre?
4. Draw BMD for a propped cantilever beam span ‘L’ subjected to UDL throughout w/m.
5. Define core of a section and draw the same for a circular section.
6. Write Rankine’s equation for column.
7. Define principal plane and principal stress.
8. State the principal stress theory of failure.
9. What is ‘fatigue strength’ and ‘endurance ratio’ in a fatigue testing of material?
10. Write the Winkler-Bach formula for a curved beam.

## Automotive Electrical And Electronics 5th ND10 AT2302

Posted by Varuna V on 5:22 PM

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010
Fifth Semester
Automobile Engineering
AT 2302  AUTOMOTIVE ELECTRICAL AND ELECTRONICS
(Regulation 2008)

PART A — (10 × 2 = 20 Marks)

1. What do you mean by rating of a battery?
2. What is meant by battery plate sulphation?
3. Give the requirements of starter motor.
4. What do you mean by third brush regulation?
5. List out the problems encountered in the contact points of ignition system.
6. Differentiate hot spark plug from cold spark plug.
7. What is adaptive ignition system?
8. Differentiate HEI distributor and conventional breaker-point.
9. How do you reduce head light dazzling?
10. Mention the advantages of earth return system.

PART B — (5 × 16 = 80 Marks)

11. (a) Describe the testing procedure for laboratory and manufacturer’s tests of lead-acid battery with neat sketches.
Or
(b) (i) Explain the constant current charging method of automotive batteries with a sketch. (10)
(ii) Explain the care and maintenance of automotive batteries. (6)

12. (a) Explain the constructional and working details of solenoid operated pinion drive of starter motor with a sketch.
Or
(b) Explain the working principle of alternator with its three stator circuits. State the advantages of it over D.C. generator.

13. (a) Draw the circuit diagram for battery coil ignition system of six cylinder four-stroke petrol engine and explain it.
Or
(b) (i) What is the need of altering the ignition timing with respect to engine speed and load? (4)
(ii) Explain the centrifugal and vacuum advance mechanisms with the help of neat sketches. (12)

14. (a) Explain the distributorless ignition system with suitable sketch.
Or
(b) (i) Describe the working of breakerless ignition system with neat sketch. (8)
(ii) Explain electronic spark timing/control with a circuit diagram.(8)

15. (a) (i) What is meant by dazzling of head lights? (2)
(ii) Explain the various anti-dazzling devices with neat sketches. (14)
Or
(b) Write notes on the following :
(i) Electronic fuel pump, (5)
(ii) Electrical horn, (5)
(iii) Oil pressure gauge. (6)

## Unix Internals 6th ND11 CS2028

Posted by Varuna V on 1:08 PM

Anna University
B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.
Sixth Semester
Computer Science and Engineering
CS2028 - UNIX Internals
(Regulation 2008)

PART – A (10 × 2 = 20 Marks)

1. What is u-area?
2. What is the use of buffer cache?
3. What should happen if the kernel attempts to awaken all processes sleeping on an event, but no processes is asleep on the event at the time of wakeup?
4. What are signals?
5. What is close system call?
6. What is the use FORK system call?
7. What are special files?
8. What is the use of shell?
9. What are streams?
10. What is character device switch table?

PART B-(5*16=80 MARKS)

11. (a) List out the reasons for popularity of UNIX OS.
(b) How to exam us the architecture of UNIX.
OR
12. (a) How to exam us about file sub system.
(b) How to exam us about kernel data structures.

13. (a) How to exam us about the Organization of buffer header.
(b) Explain about algorithms for studying and writing disk blocks.
OR
14. (a) How to exam us how byte offset is converted to block numbers in the file system.
(b) Write a note on superblock

15. Write short notes on
(a). Pipes
(b) STAT and FSTAT.
OR
16. (a) explain about file and record locking .
(b) How to exam us about DUP system call.

17. (a) How to exam us about process situation.
(b) Write notes on process creation.
OR
18. (a) How to exam us about attached algorithm.
(b) Explain about system boot and unit process.

19. (a) How to exam us about swapping in detail
(b) Explain about fair share scheduler.
OR
20. (a) How to exam us demand paging in detail.
(b) explain in detail about driver interfaces.