Answer / kalyan

condition for max efficiency of 3-ph transformer,when core
loss=cupper loss.
condition for max efficiency of d.c.motor,back e.m.f=supply
voltage/2

Answer / manoj tyagi

for electrical machines max. eff.
veriable ohmic losses=constant core loss

Arrangement of earthing materials.like what we put first charcol,then salt.then plate. Plz answer me about that.

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How do you select the pickup value of the relay?

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What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?

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Why 50hz and 60hz frequencies are used by the world, why they are not taking 55hz?

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when we increased the current what do ?

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What is Co-generation in the context of electrical power systems?

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Why the efficiency of generator is more than motor in swinburne's test

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we are having 110 Kv,250mA Electrostatic precipitators for coal fired boilers. what will be static voltage and current after discharge and what time it will remain before earthing?

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Why in USA supply voltage parameters(230V,60Hz)are different,is there any advantage please brief.

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how to define that what is resister ,capacitor& inductor.

1 Answers  

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