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Electrical Machines

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

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards brush axis.
 Peaky in nature.
 Triangular and directed towards main pole.

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Electrical Machines
During hunting of a synchronous motor

  harmonic are developed in the armature circuit.
  negative phase sequence currents are generated.
  field excitation increases.
  damper bar develops torque.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
 Effect of field flux on the armature flux.
None of these
  Effect of armature flux on the main field flux.

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Electrical Machines
Ward Leonard control is provides speed control

  Above rated speed.
  Below rated speed.
  In one direction only.
  In both direction.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

  65.8 Nm.
 74 Nm.
 38.5 Nm.
 27.73 Nm .

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