Kurukshetra University 2009-3rd Sem B.Tech Electronics and Communications Engineering B,tech ester(EMEC ) - Question Paper

BT-3/D09
ELECTROMECHANICAL ENERGY CONVERSION
PAPER : ELE-201(E)
Time : 3 Hours Maximum Marks : 100

Note : Attempt 5 questions,selecting at lowest 1 ques. from every unit.All ques. carry equal marks.

UNIT-1

1.Discuss the magnetic materials generally used in electrical machines.With the help of diagrams,discuss the constructional details of a single phase transformer.Develop its E.M.F. formula.

2.Discuss different tests needed to determine the equivalent circuit parameters of a transformer.

UNIT-2

3(A).Develop the expression for energy and force in a singly excited magnetic field system.
(B).With the help of neat diagram,explain the procedure to determine the magnetic characteristics of a d.c shunt machine

4.Develop the expression for generated e.m.f in a d.c. generator.Explain the e.m.f build-up in a d.c. shunt generator.

UNIT-3

5.Develop the expression for torque for a three-phase induction motor.Draw and discuss its torque-slip characteristics.

6.Explain the ways to control the speed of three-phase induction motors.

UNIT-4

7.Define voltage regulation for an alternator.Give its importance.List the different methods and explain the m.m.f method to determine voltage regulation.

8.Discuss V-curves and starting of synchronous motors.

Earning:   Approval pending.