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Electrical Machines

Electrical Machines
Compensating winding is placed in the

 pole shoe
All of these
 main field
 armature core

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
 Series shunt.
  Differentical compound.
 have an equal number of electrons and protons.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
 0.66 Ω.
  0.24 Ω.
 0.45 Ω.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 1.644 KW.
  2.73 KW.
 0.9103 KW.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
None of these
 inversely as applied voltage
 directly as applied voltage

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 25 Hz
 100 Hz
 50 Hz

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