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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 decreases.
 decreases
 remains constant.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Delta - star
 Star - star
 Star - delta

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Armature resistance control.
 Armature voltage control.
 Field diverter control.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Ns
 S.Ns
 Nr

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech

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Electrical Machines
In alternator, the rotary part is

 core.
 armature.
  magnetic field poles.
 none of these.

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