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Posted By: k.srinivasan Member Level: Silver Posted Date: 09 Jul 2008
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2008 Anna University Electronics and Communication B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2008 Question paper
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T 3249
B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2008
Third Semester
Electronics and Communication Engineering
EE 1211 – ELECTRICAL MACHINES
(Common to Electronics and Instrumentation Engineering and Instrumentation and Control Engineering)
(Regulation 2004)
Time: Three hours Maximum : 100 marks
Answer ALL questions.
PART A – (10 x 2 = 20 marks)
1. What is a self excited d.c. machine?
2. State the advantages of Swinburne’s test.
3. What is a step up transformer?
4. Draw the no load phasor diagram of single phase transformer.
5. Define slip of an induction motor.
6. List out four applications of single phase induction motor.
7. State any two applications of stepper motor.
8. Define voltage regulation of alternator.
9. What is the need of a sub-station in the power system?
10. What are the different types of cables generally used for 3-phase service?
PART B – (5 x 16 = 80 marks)
11. (a) (i) Discuss how a d.c. generator builds up e.m.f.
(ii) A 4 pole generator with wave wound armature has 51 slots each having 24 conductors. The flux per pole is 0.01 weber. At what speed must the armature rotate to give an induced e.m.f. of 250 V. What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed?
or
(b) (i) Draw and explain the characteristics of D.C. shunt and series motors.
(ii) A 400 V d.c. shunt motor takes 5 A at no load. Its armature resistance (including brushes) is 0.5 ? and shunt field resistance is 200 ?. Estimate the efficiency when the motor takes 50 A on full load.
12. (a) Explain how the efficiency of a transformer may be found from the open circuit and shout circuit tests.
or
(b) (i) Describe the constructional features of any one type of single phase transformer.
(ii) A 600 kVA single phase transformer has an efficiency of 94% both at full load and half load at unity power factor. Determine the efficiency at 75% of full load at 0.9 power factor.
13. (a) (i) Explain the principles of operation of 3 phase induction motor.
(ii) Explain any one method of speed control technique adopted for speed control of a 3 phase induction motor.
or
(b) Write a brief note on:
(i) Shaded pole induction motor
(ii) Capacitor starts and Run induction motor.
14. (a) Describe the method of determining the regulation of an alternator by synchronous impedance method.
or
(b) Explain using a diagram the construction and working of reluctance motor.
15. (a) Explain the working of Nuclear power generation plant with schematic arrangement.
or
(b) Explain in detail about different types of insulators.
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