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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Capacitor run
 Resistance split phase

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 remains constant.
 decreases
 increases.

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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

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

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC series motor.
 DC Shunt motor.
 Synchronous motor.
 DC compound motor.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 0.08
 -1.92
 1.92

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
 Armature winding is in series with load.
 Armature and field both are connected.
  Armature and field both are in series with the load.

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