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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 32.
 8.
 16.

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
 1-phase induction motor
None of these
 both 1 and 2

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

  10°.
 45°.
 30°.
 24°.

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Electrical Machines
In DC machines internal characteristics are plotted between

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

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

 rectangular
 sinusoidal
 co- sinusoidal
 flat-topped

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 lagging power factor.
 unity power factor.
 leading power factor.
None of these

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