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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  speed and voltage.
  load.
  voltage.

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
 Auto transformer starter.
  All of these.
 Star-delta starter.

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  pulsating.
  sinusoidal.
  rectangular.

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To neutralize the distortion of main field flux due to armature reaction.
 To serve the economical aspects.
 To get a superior commutation.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 16.55 Nm
 15.28 Nm
 Zero

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