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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
 AC.
 DC.
None of these

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
  60 Hz.
 0.75 Hz.
 0.70 Hz.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 12
 10
 24

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 full wave
 half wave controlled

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 wrought iron.
  cast iron.
 cast steel.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  dynamically induced voltage.
  statically induced voltage.
  reactance voltage.
None of these

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