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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  P and Z.
  none of these.

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Electrical Machines
The ventilating ducts in most of DC machine are

 none of these.
 radial as well as longitudinal.
 radial.
 longitudinal.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 rectangular
 co- sinusoidal
 flat-topped

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Electrical Machines
A DC generator without commutator is a

 induction motor
 DC motor
 AC generator
 DC generator

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 56.91 V.
 86.91 V.
  66.91 V.
 76.91 V.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 1440, 1500.
  60, 1500.
 50, 1500.

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