Answer Posted / rahul

of course it will not run..coz an AC motor(sync or ind)
needs rotating magnetic field which is possible to get only
if dc supply is rotating. Sync motor has arm on stator. So
no rotating field. And induction m/c run on Electromagnetic
induction principle which is not possible with dc coz ckt
saturates in dc(similar to transformer). So there can be
heavy heating followed by damage;

A 3-PHASE TRANSFORMER IS USED TO STEP-DOWN THE VOLTAGE OF A 3-PHASE, 11KV FEEDER LINE. PER-PHASE TURNS RATIO IS 12.FOR A PRIMARY LINE CURRENT OF 20A, CALCULATE THE SECOUNDRY LINE VOLTAGE, LINE CURRENT AND OUTPUT KVA FOR FOLLOWING.A)STAR- DELTA.B)DELTA-DELTA.

3116

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Hi everyone, I'm Lachuu, recently joined automation company as PLC Engineer. I have certain basic question, I request all big gurus and seniors to answer these question. Because this will be very helpful to me as well starters like me. How to design a control circuit (ex: pick & place - my current project) Yamaha robot PxYx series controller RCX222, using 6 cylinder double acting, plc keyence kv p16r 2 expansion unit for input and output each. How to select panel terminal mcb elcb powersupply. My main concern in some projects how to select dc power supply, mcb rcb(I came across dif bt b c d curves, but stil confusing, pls help me :-(. I would really appreciate all who are going respond to this question.

2000

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some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

1816

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what is the prosses for getting of 33kv licence (i have completed my engineering degree & working in 33kv substation for contract basis )????

1990

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Define settling time.

1212

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how can we say that stator magnetic field rotates with synchronous speed?can we derive?

1817

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Which standard we are following earthing resistance test

1469

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What if the difference beween internal and exrteranal LBB?

1721

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what is the formula for calculating the phase clerance between two phases and phase to earth how to calculate the cable for a motor

2095

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Give some differences between open loop and closed loop control systems.

1222

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2244

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What aturn on methods of scr?

1232

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75 kw motor take 45 amp in no load delta in star 10 amp but in load it will take 160 amp but IR velue of winding above 500 at 1kw ph to earth and ph to ph. what problem it should be?

3785

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how to test reverse power trip?

4519

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2033

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