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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 slightly increase.
 not change.
 slightly decrease.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Both rotor and stator winding.
  Rotor winding.
  Stator winding.
  Rotor mmf wave.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2
 (V2 - E2) / E2

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 NnL − NfL.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 1500 rpm
 375 rpm
 75 rpm

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 insulating material.
 non-ferrous material.
 silicon steel.

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