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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what are the ''pitting rings''and how cn they be controlled in a series generator

0 Answers  

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iii) A shunt motor runs at 70 rad/sec from a 460V supply and takes in an armature current of 100A. Resistors of 2.52 ohms and 1.64 ohms are connected in series with the armature and in parallel with the armature respectively. The field excitation remains direct from the 460V supply but the generated torque is halved. Determine the new running speed. Neglect brush voltage drop. The armature resistance is 0.4 ohms. [15]

1 Answers  

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what is the criteria for selection of conductor used for ehv ac electrical dischrge

0 Answers   National Productivity Council,

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What is Load commutation and how it is done?Cite some example where this type of commutation is used

2 Answers   NTPC,

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What will be the average KVA rating of Auto Transformer for 75kw 415V , 3phase induction motor

2 Answers  

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How to test REF relay testing for LV panel as per Kahramaa standard?

0 Answers  

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how we can use resistance heating for any domestic purpose???

2 Answers  

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What is the meaning of C1, C61, C91 cable

0 Answers  

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What is ferrite affects and what is disadvantage of ferrite affects.

1 Answers  

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why we testing the core balance of the transformer before comissioning?

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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