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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 conduction.
 radiation.
  convection.

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

  Series.
 Compound.
 Parallel.
 None of the options.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 a positive finite value
 ∞
 a finite negative value

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 zoom.
 magnetostriction.
  hum.
 boo.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 decrease the amount of copper to be used.
 increase the strength of rotor bars.
 reduce the magnetic hum and locking tendency of rotor.
 provide ease of fabrication.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  None of these.
  120 volt.
  218.5 volt.

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