Answer Posted / alpha cherian

Transformer Copper loss depends on the current drawn and
Iron loss depends on the Voltage. These are affected by the
load connected to it. While designing it is unpredictable.
Since power factor is not constant "KW" rating will be
wrong. Hence rating in kVA.
Kw rating = kVA rating x Power factor

What is the implications when 600 hp motor is started when the unit is running with Transformer of capacity 1500 KVA and DG set of 1000kva

2215

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During Testing of Maintenance Free Earthing, How deep should be the Spikes of Earth Test Meter should be inserted in the soil(one spike is 15 Meter & Other spike is 30 Mtrs away from the Main Earth Electrode. Because, recently, we observed that when spike is inserted 3-4 Inch in the earth- results are better, If spike is inserted 1 feet deep than results are increasing.

1947

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I have motor of 3 H.P. How i found the rating of capacitor use in it in single phase motor..???

2633

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i need the curve duty cycle and amper for (150 kva @50% dyty cycle) transformer turn ratio :19 and vin 400

2135

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How two nos. 130 kw D.C motor get synchronise using D.C drive.

2130

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please send me latest & previous years question papers for IOCL Technical level questions

1885

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Why efficiency in thermal power plant is low?

1118

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How do we find the rating of a transformer, if it got burnt badly.

1557

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why magnetising curve not start with zero voltage?

2294

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What is center gravity load in substation?

2424

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If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

1153

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what is the difference between the characteristics of two different phase bushing of any transformer

1806

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WHAT IS MEANT BY SHEATH VOLTAGE IN 132Kv cable?

2276

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can any tell me why slope 40% and 80% is calculated in differential protection?

1888

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why tertiary winding is used in transformer with diagram?

2252

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