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03000EE311092001

PART ‏تا‎

Answer any three full questions, each carries 10 marks.
Draw and explain phasor diagram of a transformer at capacitive load.
Explain with diagram current transformer and potential transformer.
The maximum flux density in the core of a 240/3000V,50 Hz single phase
transformer 15 1.3Wb/m? . If the EMF per turn is 8Volt. Determine i) primary
and secondary turns ii)area of the core
What do you meant by all day efficiency of a single phase transformer
Explain open circuit and short circuit test of a single phase transformer with
circuit diagrams.
Differentiate between slipring and squirrel cage induction motors.
Draw and explain the torque slip characteristics of a three phase induction
motor.
Prove that a three phase supply will produce a rotating magnetic field of
constant magnitude in a three phase induction motor.
What is meant by circle diagram of an induction motor? What are the
parameters we get from the circle diagram?
Explain with diagram auto transformer starting of a three phase induction
motor.

PART C

Answer any four full questions, each carries 10 marks.
Explain with diagram the working of universal motor.
Draw and explain V curves of a synchronous motor.
What are the methods of starting a synchronous motor?
How voltage regulation of an alternator is determined by EMF method.
Explain.
Define winding factor of an alternator.
Single phase induction motor is not self-starting. Justify?
Explain the working of capacitor start single phase induction motor with

diagram. Also list its applications.

Draw the schematic diagram of a permanent magnet stepper motor and explain
its working.

Draw and explain the torque speed characteristics of a stepper motor.

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