why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply

12 Answers   APTransco, Proman,

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If a rotary UPS is in line through grid power; What would be the impact on Power Factor if the load through rotary ups is 25% , 50% , 75% & 100%. Will the power factor reduce with less load?

0 Answers  

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If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?

5 Answers  

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how to calculate circuit breaker capacity

6 Answers   Siemens,

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What is the value of 3 phase voltage?

8 Answers   RECPDCL,

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How do we check transformer losses and what are the ways to minimise it.

5 Answers  

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what is the full form of XLPE adn there use.

4 Answers   Voltas,

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A synchronous motor is operating at a leading power factor .if the applied voltage is decreases ,(the excitation remains constant ) ,the motor current a)increases b) decreases c)remains same d) none of these

2 Answers  

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Explain Need of a starter in a dc motor.? Also explain any two starting and speed control method of dc motor?

0 Answers  

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What is skin effect?

2 Answers  

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What is boucholz relay and the significance of it in to the trformer?

0 Answers  

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what type of questions are asked and howmwny questions belong this catagory?

0 Answers   RRB,

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