Answer Posted / tapan desai

Because due to ac supply the
torque produce in rotor is in
pulsating nature so filed is
produce also in pulsating
nature so that neglect each
other so for provide constant
torque and field we give dc
supply or dc excitation to
rotor with help of slip ring.

What is the effect on power factor, shown by a trivector meter; incase of reverse phase sequence. If the power factor of a system is lag what meter will show in case of reverse phase sequence connected to the meter. and What in case of lead.

1818

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in HT service 3ph 4 wire service Y-phase voltage shows zero . whether it is meter fault? or what be the reason ? if y-ph voltage zero ,can current is recorded? reasons for failure?

1414

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Actually I have a doubt on neutral and earth.we use Ac power without taking neutral by connecting to earth,but at that time does it affects on efficiency of any electrical components or no? If yes how?

960

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How colour picturetube works & how many year it will works.

1580

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anyone knows service engineer in chennai for EDM SPARKING MACHINE.CHMER PULSE CD 60 M.pL GIVE ANY CONTACT NOS

1976

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what is your aim

1448

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what is servo motor and how to work it.

1470

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If oil and air can withstand a high MeV when used as an insulator in a transformer, what are the values of how high for each material?

1359

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how to find ratio of CT & PT in 66/11kv 12 mva supply system ? explain with calculation.

1886

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How can we find the breaking capacity of a Load breaker switch (LBS) fed from 11 kv supply??ex:50KA, 26kA etc???detailed step vice answer pls.

1592

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What is resonant frequency?

712

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wat is the first thing dat is needed, 2 lay a cable in some area??

1419

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We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.

1258

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In what condition the HT fuse breakes?

1495

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I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?

1227

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