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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 4.76%.
 3.76%.
 2.56 %.
 2.57 %.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

  Series.
 Parallel.
 None of the options.
 Compound.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 there is no hard and fast rule for this.
 lie under north pole.
 lie under south pole.

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  3 - φ IM.
  1 - φ IM.
  DC shunt motor.

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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

 remain the same
 increase
 become zero
 decrease

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