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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 triangular wave.
 square wave.
 sine wave.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.6 Nm
 15.92 Nm
 15.28 Nm
 16.55 Nm

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on designed speed.
  the generator runs on full load.
  the generator runs on overload.

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Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  stainless steel.
  cast iron.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
  4 / 5.
 5 / 6.
 6 / 7.

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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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