can some one clearly explain why -48 volt DC use in telecom site????

0 Answers  

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how to calculate induction motor rating (HP) if name plate is missing from motor at site condition ?

6 Answers   ABB, apatel, Bhel, Spatel, Voltas,

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how to calculate the cable size depending on the amps?

1 Answers   Polycab,

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I am mechanical engineer,I need Training in Electrical & Electronics ( i.e. three days workshop training ) Where will I get the same Please suggest?

2 Answers  

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what is skin effect? why is it absentin dc system

22 Answers  

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we are using three transformer 33000/430 vac for three separet block.all three transformer have three LT panel separetly. can be Interconnected all three panel through bus coupler. this is permissable or not by state electricity board.

4 Answers   Piramal Healthcare,

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need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

0 Answers  

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I am going to appear for the RRB Chennai Section Engineer online exam. Please send me the question papers from 2001 to date to my mail id: vsujith_rajan@yahoo.co.in

3 Answers   RRB,

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presently I am working in private sector.In powergrid interview recruiter asked me why you join this organization.

0 Answers   Power Grid,

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Unbalance in voltages at motor terminals is caused by ____.

0 Answers  

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What is load boxes ?

0 Answers   AMIE, PEPL,

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how to operate and maintenance of 1500 kva diesel generator set

0 Answers   Supertech,

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