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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 60°
 18°
 30°

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

All of these
 Stator core loss
 Rotational loss
 Stator copper loss

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 plugging.
 crawling.
 cogging.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 decrease
 increase
 remain the same

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  less than 1 %.
  zero.
 1.5 %.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 3 to 5.
 1.0.
  1.5 to 2.

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