Answer / santosh

When electrical energy is converted to mechanical energy m/c acts as a motor& when mechanical energy is converted to electrical energy it acts as a generator. This is the basic principle. As far as induction motor is concerned what mentioned above is true.

Answer / shahbaz sahikh

when yhe slip is possitive at that time machine acts as
motor as s=(Ns-N)/Ns and when slip is negative acts as
genrator.

In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

0 Answers  

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why the voltage and current in a long transmission line are called travelling wave?

0 Answers   UIU,

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Which is stiffer between salient pole rotor and cylindrical rotor synchronous machines? Justify your answer.

1 Answers  

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I have a 33 KV sub stn with two mother transformers 33/11 KV of capacity 3150 and 1600 KVA respectively. The total connected load 16809 KVA(11/0.433KV).how i calculate the max current & how i decided the CMD.

2 Answers  

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What is kvar?

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Why in celling fan stator are rotatig while rotor are steday

6 Answers  

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Isi standard of lux level required / to be maitained in different working place general & in textaile industry.

1 Answers  

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers  

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can we run 3 phase induction motor under 2 phase supply

12 Answers  

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suppose if oil in transformer is not used than what constructional change you will do,for insulation and cooling?

2 Answers   ABB,

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what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?

0 Answers  

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How can maintain our H.T. motors used in cement plant. please send me procedure.

0 Answers  

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