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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 √3
 1/√3
 3

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 supply voltage V
 1/V²
 1/V

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 1 V
 4 V
 2 V

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 Greater than 90°
 less than 90°
 90°
 0°

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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

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

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

 half wave
 full wave
 half wave controlled
 full wave controlled

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