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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 copper loss
 iron loss
 mechanical loss

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 component of armature mmf along field axis
 uneven air-gap length
 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 increase.
 decrease.
 remain unaltered.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
 equal to that of the effective length of the line.
 greater than that of hydro generator.
  none of these.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 less and maximum torque decreases
 more and maximum torque decreases
 more and maximum torque remains constant

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
 Collecting of large current is simple.
 Insulation requirement is less.
All of these

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