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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

  Low.
 1000 ohms.
 Infinitely large.
 around 500 ohms.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1, 2 and 3
 1 and 3
 2 and 3
 1 and 2

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 100 KVA
 50 KVA
 123.3 KVA

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and direct axis
 quadrature axis and interpolar axis
 direct axis and indirect axis
 direct axis and interpolar axis

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Both wave and lap winding.
 Wave winding.
 Lap winding.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 rectangular.
 trapezoidal.
 sinusoidal.

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MORE MCQ ON Electrical Machines

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