why do we need transformers?

12 Answers  

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what is the main use of ac and dc drives ? it is only used for speed variation or for power saver also?

1 Answers  

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how we can calculate 2 phase welding transformer rating or total power?

0 Answers  

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In DC motor,the field MMF is given by NI.N-no.of field winding turns,I-excitation and both are constant.Then how could the main flux decreases due to armature reaction.

4 Answers   Bhel, IBM,

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What is the diffrence in between Class PS & Class 5P10 for CTs

7 Answers  

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iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

0 Answers  

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HOW TO CALCULATE LV CABLE SIZING?

2 Answers   L&T, MRF,

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Why voltages are 11kv 33kv why not others?

2 Answers  

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% voltage variation in distribution a)1% b)5% c)10% d)15%

2 Answers  

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how to find the capacitance value of the motor while running??

0 Answers  

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1. What is the exact formula for one weber? for example,(one ampere = one coulomb electron of electrons crossing a point of conductor at one second. i.e, 1A=1Q/1sec)

0 Answers   Bhel,

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How to select the cable size for the given load ?Pls explain the Formulae

3 Answers  

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