Answer Posted / karthik

a 3 phase machine is used for high power application and the rotating magnetic field is created by the 3 phases hence when it is connected to a single phase supply we will not be able to create a rotating magnetic field unless the field is connected along with a capacitor or inductor to create a phase difference. but whena single phase machine is connected because of the inherent phase lag between the various phase of supply.

what is cascade speed control device?and how this device control the speed of motors?

2158

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How i can decide that HVDC line is best for transmission.

1922

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HOW TO CALCULATE THE REGULATION OF 100 AND 25 KVA TRANSFORMER

1983

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I would like to know that the fault curretn at base load and at 10% generation will be same? Fault level of BUS remain same with different generation?

1865

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diff. between tension mode & speed mode

2337

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How to calculate the size of earth cable to earth the neutral of UPS ?

1937

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What is the most essential condition for the voltage build up for a d.c. Shunt generator?

1153

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features of hbc fuses

2422

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WHY DO VOLTAGE TRANSFORMERS FAIL DURING EARTH FAULT IN THE DELTA CONNECTED 6.6KV ELECTRICAL SYSTEM

1994

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Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

2184

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Explain Need of a starter in a dc motor.? Also explain any two starting and speed control method of dc motor?

1721

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How to calculate the value of earth capacitance in a transmission line.

2364

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Does outdoor isolator loose connection cause short circuit current in that circuit? if yes then how ??

1700

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how does a submersible pump work..?

1965

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What is Anemometer used to measure?

1126

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