Answer / pillay

DOL starter means a Direct On Line starter, where the AC
supply is directly applied across the motor terminals
whenever it is used unlike some bigger motors where the
power supply goes through a starting system to enable a
smoother start or a reduced current start.Some examples are
star delta ,auto transformer starter ,rotor resistance
starter, soft starter etc.

I don't understand why when we connect high voltage source in DC to electronic motor , we must add capacitor and resistor in parallel ? (I know that we use capacitor because we want to absorb the current that in the first second electronic motor in opposed with current course produce. ) what are the feature of Resistor and in such situation ?

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What happen if 1200KW/1500KVA alternator runs at no load and high R.P.M.for one minute?

6 Answers  

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HARMONICS ARE ALWAYS IN INTEGER LIKE 2ND OR 3RD HARMONICS,NOT IN FRACTION LIKE 0.5 HARMONICS.....????????

2 Answers  

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how to calculate cable size with respect kw

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difference between torque mode and speed mode

4 Answers   JSW,

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Is there is any difference between AC and DC Cables

1 Answers  

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IF I KNOW THE AREA OF CROSS SECTION OFTHE WIRE , WATTAGE OF THE LOAD ,VOLTAGE SUPPLY WHAT IM GIVING TO THE LOAD AND ALSO POWER FACTOR OF LOAD ....... SO GIVE ME FOR WHAT AMOUNT OF CURRENT I SHOULD USE WHICH TYPE OF CABLE?

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How to calculat size of copper & aluminium ?

6 Answers  

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will the introduction of capacitor bank parallel with the induction load reduce power consumption

4 Answers   Nokia, WAPDA Water and Power Development Authority,

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Transformer cores are laminated in order to A simplify its construction B minimize eddy current loss C reduce cost D reduce hysterisis loss

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What is Exitation voltage and Exitation current? What is the function of these in Alternator?

2 Answers   TC, Tisco,

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any one guide me to reduce the power factor of diesel Generator from 0.97 Leg to 0.8 Leg.with out any change in my load.

0 Answers  

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