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Electrical Machines

Electrical Machines
Diverters are used only in

 either of these
 shunt motors
 series motors
None of these

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 normal speed.
 synchronous speed.
 slip speed.

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Armature resistance.
 None of above.
 Field resistance.
 Residual magnetism of the generator.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

All of these
 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 3 only
 1, 2, 3 and 4
 1, 3

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 carbon.
 silicon steel.

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