in trains i have seen the terminal which is connected at the top of the train is positive .where is negative ? track? i dont think so

9 Answers  

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Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?

0 Answers  

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why current flows from +ve to -ve terminal

7 Answers  

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If mutual flux is 1.2wb & power factor is 0.8 lag , then what is the Useful flux of a transformer?

0 Answers   Nalco, NTPC,

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what is the meaning of insulation level?

2 Answers  

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can we use 3 phase UPS for Motors and Other Machines

4 Answers   ACC,

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Difference between Lugs and Thimbles

0 Answers   ABB,

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if the voltage across the lamp drops by 1%, the power drawn will be reduced by how many %?

5 Answers   PSPCL,

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what are the names of oil used in transformer and its chemical name?

11 Answers   Bhel, CSEB,

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How to measure power in 2 or 4 or n phase circuit? Please give me a formula.

0 Answers  

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What is master trip relay? How does it work?

1 Answers  

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what is the pre commissioning test to be carried out on LT power panel at site?

1 Answers  

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