Why dc supply is used for closing and tripping coil of ht breakers. What happen if we use only ups ac supply only.

12 Answers   ACC, JLL, ZETDC,

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i have 60Hz motor, can i run it at 50Hz power supply ???

2 Answers  

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What will happen if induction motor is supplied with capacitive load?

1 Answers   NTPC,

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What kind of preventive maintenance are there for AC induction motor?

1 Answers   Gulf,

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In a 3 phase squirrel cage induction motor why does rotor rotate? will 3 phase transformer rotate like a motor if it is placed on bearings and powered up? give reason

10 Answers   Siemens,

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( Re: WHAT SHOULD BE THE RATING OF MCCB FOR 415V,3Ph,50KVAR CAPACITOR BANK Answer # 1 The capacitor current would be kvar x 1000 / (415 x sqrt3). This would be 70a approx. The MCCB selected should have *atleast 1.4 times this current i.e. 1.4 x 70= 98. So you should choose at least 100 A mccb.) regarding to this answer,i would like to know why the current have to times 1.4 to get the right amphere for the mccb.hows the formula to get the 1.4??tq

2 Answers  

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how can we calculate fault current of a line in a 6 bus syatem if the faulted line is known?

1 Answers  

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1 sq.mm alluminum cable hou much current caraing capacity

5 Answers  

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How ships are protected from lightning?

1 Answers  

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kindly tell me how the load on generator increase by just increasing the fuel of prime mover, as if for exampple 20 MW gen set is synchronized the load ramps from zero to 20 MW gradully and during this procress only fuel of prime mover increases. Which thing determines the load on generator with respect to fuel

4 Answers   Birla,

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What is Reactance & Impedance? what is diffrence between these?

2 Answers  

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why we are 0.8 power factor only?

1 Answers   Suman Industries,

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