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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
 Speed regulation.
 Starting torque.
  Effiency.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 45°
 60°
 10°

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm.
 KhfBm3.
 Khf2Bm1.6.

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

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

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 hysteresis loss
 temperature rise
 eddy-current loss
 mechanical loss

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