Anna
University, Chennai Nov/Dec 2012 Examinations

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Important Questions

EE
2302/ Electrical Machines- II

V Sem EEE

Unit
I-V

1.
Derive the emf equation of an alternator.
Explain pitch factor and distribution factor

2. With a neat diagram explain the parallel operation of alternators
by any one method.

3.
Discuss
the parallel operation of two alternators with identical speed/load
characteristics

4. Explain the operating principle of three phase alternator

5. Draw the equivalent circuit and phasor diagram of a synchronous
motor

6. Discuss the methods
of starting and procedure for starting synchronous motor

7. Explain the effect
of excitation on armature current and power factor of synchronous motor and
thereby obtain ‘V’ curves and inverted ‘V’ curves

8.
Develop the circuit model of 3-phase
induction motor. Represent the approximate

model and state its significance

9.
Derive the expressions for torque and the
conditon for maximum torque of an

induction motor

10.Explain in detail
about double cage rotor induction motors

11. Explain the various schemes of starting squirrel cage induction
motors

12.Explain the working
of auto-transformer and star-delta starters with diagrams

13. Explain the cascade control of two induction motor.

14.Explain the speed control of three phase induction motor by pole changing.

15.
Explain the principle and operation of AC
series motor

16.Explain the principle and operation of reluctance motor

17.
Explain the principle of operation and
constructional details of linear induction motor.

18.Explain with suitable diagram the working principle of split phase
and capacitor start induction motor