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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 2.5Hz
 50Hz

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  flux per pole.
All of these
  number of turns in coil.
  frequency of waveform.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 pulsating and unidirectional
 oscillating
 steady and unidirectional
None of these

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Synchronous motor.
 DC Shunt Motor
 Induction motor.
 AC single phase motor.

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Electrical Machines
Sparkless commutation can be achieved by employing

  high resistance carbon brushes.
  any one or more of the above methods.
 compensating winding.
  inter poles.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 interpole and compensating windings together
 armature winding

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MORE MCQ ON Electrical Machines

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