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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
 DC machine
 Synchronous machine
All of these

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 20 volts.
 10 volts.
 30 volts.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  980 Watt.
 1800 Watt.
  1960 Watt.
 1920 Watt.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.
None of these
 auto transformer.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 24°.
 30°.
 45°.
  10°.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

  Commutator.
 Brush.
 Armature.
 Yoke.

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