Answer Posted / anil

Variable frequency Drives(vfd) are used for controlling the
speed of AC motors by changing the frequency of power
supply. the advantage of using them is fast and accurate
and more controlled and relaible device they can be used
for where speed is very important such as CNC ,machin
tools , special purpose conveyer m/c etc.

for a 500 KVA connected load, I calculated 30% of capactor for power correction. Even after using 225 KVR capactor PF is not improving. What could be reason for low Phase correction factor?

2004

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how to check three phase motor torque value?

2425

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What is a commutator?

1111

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upto how much low RPM we will run the commercial motor which is run through VFD without any problem occurs in motor.Motor rating Duty is S1 & RPM is 1400.

2204

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What are the disadvantages of hydropower?

1304

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how is control wiring coding is done in a CRP panel ?

2078

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what r the safety measures in UPS ? explain all?

2265

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one split ac how can told of this ac which Tr tell me us

2083

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Classify drilling machines.

1207

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If we have to find the inductance of a dc shunt motor then by giving dc supply or ac supply and what is the reason for it. (this example is from "to determine the transfer function of a dc shunt motor ")

2030

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what are the industrail measures to over ferranti effect? how would the ferranti effect the power system if those remedial mearsure arent taken? how often does this effect occurs in real power system?

2208

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Difference between On Line capacitor and Station Type capacitor.

2087

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HELLO SIR, IAM PREPARING HPCL EXAMS. SO PLS SEND MATERIAL OF HPCL ELECTRICAL ENG..TO VIJAY_8888@YMAIL.COM

1920

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Why line VTG = √3 phase VTG in star? How?

1673

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What are the Return ( Monthly / quarterly/ Annual submitted to Electical Inspector for an establishment (Factory in Maharashtra-- Small scale category having seperate HT line of 22KV ) as per Maharashtra Electricity Act

2082

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