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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 reversing drive
 both 1 and 2
 non reversing drive
None of these

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Ampere's law.
  Fleming's left hand rule.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  3600 rpm.
  600 rpm.
  500 rpm.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
 supply voltage
None of these
 rotor resistance

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 terminal voltage should be same.
 polarities should be same.
 both A and B.
 rating of generators should be same.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
 throughout the air gap.
 interpole region.
  region under main pole.

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