In electrical locomotive engines, the DC series motors is being used as traction motor. But in new engines like in WAP7 & WAG9 the 3-phase squiral cage induction motors has replaced them. So can someone tell me the advantages of induction motor over dc seris motor in engines points of view....???

0 Answers   RRB,

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Explain What will happen when direction of field current is changed (i.e, field excitation is reversed) in the following machines? 1) Alternator 2) Synchronous Motor 3) D.C Generator ( Shunt or Seies ) 4) D.C Motor ( Shunt or Seies )

3 Answers   NTPC, Transco,

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What is the most essential condition for the voltage build up for a d.c. Shunt generator?

0 Answers  

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Explain the advantages of the wheatstone bridge method of measuring resistance?

7 Answers  

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what is the safety of ACB & VCB and how can this work and how can the service the ACB & VCB parts name with picture

21 Answers   ABB, ACB, Bharti, Claris Lifesciences, Honda, L&T, RotoPower, Sterling Wilson, Wipro,

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We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

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What is meant by a stray loss of a induction motor??? What is the equation to find it

0 Answers  

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What's voltage?

1 Answers   Pakistan Atomic Energy Commission PAEC,

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What is EOL?

1 Answers  

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why transformer is conneted to dc for polarity test.it doesnt work in dc?

1 Answers   ABB, KVPY,

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How can eliminate noise problem inside temperature controller temp. variation due to contactor chattering problem.

0 Answers  

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plz tell me about BACK emf and how it generates?

2 Answers  

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