Answer / manish_2march@gmail.com

the main difference that exist is in their construction.
1.d.c motor has commutator while ac don't.
2.Direct current or DC electric motors work for situations
where speed needs to be controlled
3.They can have brushes

In a poly phase circuit if clamp on meter shows same load on three phases and their sum on neutral then why we use three and a half core cable or maximum the same size of core as that of phase?

1 Answers  

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what is the apt definition for kirchoff's current and voltage laws?

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what is meant by real power,active power,reactive power & apprent power ?please explain it?

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Can we use a Potential Transformer for Auxilliary Power supply( Spring charge Motor, Lighting etc)?

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if there is a voltage difference between neutral and earth when we operate any instrument for fraction of time then where is problem?

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Can we use a absolute encoder to show rpm of a motor ? what about the condition when power is off ? what is difference if a incremental one is used ?abanirout@gmail.com

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why we use capacitor in lighting fixer

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In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

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specific difference of ICT&Auto Transformer

0 Answers   TNEB Tamil Nadu Electricity Board,

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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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What is the difference between synchronous asynchronous memory?

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what are trouble functions of transformer?ex. prv trip,oltc,oti,wti.explain detail.

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