how to select power and control contactor .

1 Answers   Bhel,

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how to detect the presence of underground cable(while digging road)etc. -give the name of instrument

7 Answers   NTPC,

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Is it possible to obtain 480v or 550v in single phase output by giving the input to 230v to a single phase torodial type transformer without using a stepup transformer?

0 Answers  

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How can we measure the residual voltage in dc machines?

0 Answers   GPREC,

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Why control of DC motor is simpler?

0 Answers   BARC,

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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.

0 Answers   ABC,

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what is the disadvantage of leading power factor...why can't we use it (pf=0) for a long period of time?

10 Answers   Appco, snsce,

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DEAR ALL I have motors ( 10 units )each one is 90kw 380V 50 HZ 1000rpm but new local pwer is 220v 60 hz requierd rpm should be 1000 pleas what the beast solution is used frequncy converter or rewinding all motos or chang all motors thanks

6 Answers   GE,

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What is thyristor?

13 Answers  

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What is a LBB protection and why it is used?

2 Answers   Gridco,

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Why only 1 CVT in Y-phase is used for synchronization in 3 phase power system?

1 Answers   Reliance,

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How do you classify the different types of torques?

2 Answers  

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