Anna University Question Paper Code : 51435
B.E/B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Electrical and Electronics Engineering
EE 2251/EE 1251 A/ 080280003/EE 42/10133-EE 402 — ELECTRICAL MACHINES — 1
(Common to PTEE 2251 —Electrical Machines — I for B.E. (Part-time) Third Semester — Electrical and Electronics Engineering — Regulation 2009)
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PART A — (10 x 2 20 marks)
1.What are qu4si-static fields?
2.Define magnetic reluctance.
3.Differentiate between a core and shell type transformer.
4.What is the basic purpose of tertiary winding?
6.What do all practical energy conversion devices make üse of the magnetic fields as a coupling medium rather than electric fields?
7.What is the difference between lap winding and wave winding of a DC machine armature?
8.Why synchronous machine does not produce torque at any other speed?
9.List the factors involved in the voltage build up of a shunt generator.
10.Why the external characteristics of a DC shunt generator is more drooping than that of a separately excited generator?
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