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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  DOL.
None of these
  star delta.
  both A and B.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Operating speed.
 Starting torque, operating speed, full load current.
 Starting torque.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 minimum
 zero
All of these

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 run at very high speed.
 run at very low speed.
 start haunting.

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

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

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
 100 W, 2000 W.
 1000 W, 5040 W.
  3190 W, 5040 W.

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