Answer / annu

IN INDIAN RAILWAY 25000V SINGLE PHASE AC SUPPLY IS USED
WHICH IS CONVERTED IN D.C THROUGH A RECTIFIER SET BECAUSE
IN ELECTRIC ENGINE WE ARE USING DC SERIES MOTOR AND FOR
THIS WE NEED DC SUPPLY . CAUSE OF USING DC SERIES MOTOR IS
THAT ITS STARTING TORQUE IS TOO HIGH IN ALL MOTORS.

Answer / mohan

in india 25kv ac but it converts in to dc

Answer / rrl

25kv

Answer / amjad

AC 25KV

Answer / arun

25000 v single phase ac is converter to 1500 v dc.in
electric train dc series motor is used because of high
starting torque and speed control is good and also good
breaking..

Answer / dk

single phase supply of 25kv

Answer / karthik

In India 25KV AC traction is used. But in Mumbai as of
December 2010, from Mumbai CST to Kalyan; Mumbai CST to
Panvel [Central Railway] & Churchgate to Borivali [Western
Railway] is 1.5KV DC Traction....
The section from Churchgate to Borivali [Western Railway]
will shortly be converted to 25KV AC... & after some years,
Even the other 2 sections wil b converted...

Answer / niraj jha

25kv ac supply for longer dstances which is convrted to dc through rectfier which consists of diodes as electric engins require dc motors in which rotating torque is high and dc supply fr shorter dstancs like in metro.Along with ac supply dc motor is equieped

Answer / pritesh rajore

25000 V AC in all trains except some local train in Mumbai,That AC changes to DC for 1500 V DC motor of Train & 110 V DC for lighting & Fans.

Answer / k mohan rao

25kv ac supply converted to dc supply(for dc series motor)
and 110v dc supply for lighting and fans

why write 500v on line tester (Test pen)

3 Answers  

which tap of the transormer you will use in critical condition(worst)?

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For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?

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I have c license but I don't know eligibility of Max Kilo Volts under the electrical licensing board.

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why voltage swells and dips???

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Resistance of a conductor in a close electrical ckt is practically zero why?

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what is the function of RMU?

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is it necessary for 200 kva transformer to have marshaling box and cu plate earthing for neutral

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A current of 2A flows for 10 hour through a 100 ohm resistor. The energy consumed by the resistor is:(a) 0.5 kWh(b) 4 kWh(c) 2 kWh(d) 0.02 kWh

3 Answers