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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 wave winding
None of these
 both 1 and 2
 lap winding

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  not run.
  continue running in the same direction as before.
  get damaged.
  run in a direction opposite to previous one.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 1/V²
 V²
 1/V

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs load current
 Eg vs load current
 Eg vs Ia
 Vt vs Ia

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  maximum.
  minimum.
  variable.

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Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  pulsating.
  rectangular.
  triangular.

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