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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 100
 1

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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

 decrease
 remain the same
 increase
 become zero

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T2 ∝ P3.
 T ∝ √P.
 T is independent of P.

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 positive.
 low.
 negative.
  zero.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.
 shifting the brush axis from GNA to MNA.
 increasing field excitation.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 110 VA
 550 VA
 500 VA
 100 VA

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