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Anna University
Question Paper Code :51393
B.E./B.Tech - DEGREE EXAMINATION, MAY/JUNE 2014.
Third Semester
Electronics and Communication Engineering
EC 2201/EC 32/EE 1204/080290008/10144 EC 302 — ELECTRICAL ENGINEERING
(Regulation 2008/2010)
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PART A (10 x 2 = 29 marks)
1. Write the necessary conditions to be satisfied for the self excited DC generator to build up emf.
2. Give the reason for high starting current in a DC motor.,
3. List out any four general application of Transformers.
4. Define voltage regulation of a Transformer.
5. Distinguish between squirrel cage and slip-ring induction motor.
6. Name any four types of single phase induction motors based on method of starting.
7. Find the speed at 'which a 6-pole Alternator is to be driven to obtain the. Frequency of emf induced to be 50 Hz.
8. On what factors does the back emf induced on windings of Brushless DC motor . depends?.
9. State the advantages and limitation of high transmission voltage.
10. Write the desirable properties of transmission line insulators.
PART B — (5 x 16 = 80 marks)
11. (a) (i) Briefly explain the load characteristics of different types of compound generators. (8)
Explain of speed control of DC series motor applying flux control technique. (8)
Or.
(b) (i) Derive from the first principle an expression for the torque developed in a motor. (8)
A 400 V DC shunt motor takes 5 A on no-load at its rated speed. The armature resistance including that of brushes is 0.2 n and the normal field current is 2 A. Determine the efficiency of the machine., as generator delivering load current of 30 A. (8)
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