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k.prakashchandra


{ City } karkala
< Country > india
* Profession * rtd e.e.
User No # 54717
Total Questions Posted # 0
Total Answers Posted # 521

Total Answers Posted for My Questions # 0
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Users Marked my Answers as Correct # 1317
Users Marked my Answers as Wrong # 527
Answers / { k.prakashchandra }

Question { 2846 }

Any formula to calculate neutral current in 3 phase 4 wire system


Answer

Vector sum of phase currents

Is This Answer Correct ?    1 Yes 0 No

Question { Indian Railways, 4689 }

What's difference between a400amps lt contactor and a400amps lt circuit breaker


Answer

Basic difference - CB trips when the trip coil is energized, in csae of contactor , the hold coil is de- energized to trip .

Is This Answer Correct ?    2 Yes 3 No


Question { UPPCL, 4190 }

why we use delta connection in transformer


Answer

To balance the currents to some extent

Is This Answer Correct ?    0 Yes 0 No

Question { 3207 }

neutral carrying current more than phase in 3phase supply.i want to know the reason?


Answer

Zero / low current in one of the phases

Is This Answer Correct ?    0 Yes 0 No

Question { Siemens, 2866 }

Why short ckt does not happen when solenoid coil connected to supply. as its a wire only.


Answer

Opposing emf ( back emf )

Is This Answer Correct ?    1 Yes 1 No

Question { 3002 }

750kva 11/415kv transformer having percentage impedence is5.64%. 11KV HV whose current 39.37A and 415V LV whose current 1043.43A.resistance is 2.5ohm. find no load loss and full load loss?


Answer

LV side ( DC )resistance can not be 2.5 ohm for a current of 1043.43A. Taking usual losses at 0.08 % + 0.08 % , no load loss is 0.6 KW and that at full load 1.2 KW

Is This Answer Correct ?    0 Yes 0 No

Question { 3002 }

750kva 11/415kv transformer having percentage impedence is5.64%. 11KV HV whose current 39.37A and 415V LV whose current 1043.43A.resistance is 2.5ohm. find no load loss and full load loss?


Answer

Not 0.08 % but 0.8 %

Is This Answer Correct ?    0 Yes 0 No

Question { Saint Gobain, 3888 }

why do select 11000v rubber mat even we use only 415Volts


Answer

It is thick ,heavy and safer .There may be 11KV indoor breakers also .

Is This Answer Correct ?    0 Yes 1 No

Question { 3960 }

Why we apply 100ADC for contact resistance measurement?.If we apply AC what will happen


Answer

DC voltage is constant

Is This Answer Correct ?    0 Yes 0 No

Question { 3960 }

Why we apply 100ADC for contact resistance measurement?.If we apply AC what will happen


Answer

DC measures only resistance not the impedance like AC

Is This Answer Correct ?    0 Yes 0 No

Question { University of Engineering and Technology, 3690 }

why frequency meter is connected in parallel in a circuit?


Answer

As only voltage is enough for measurement

Is This Answer Correct ?    2 Yes 0 No

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