Answer / gopal manda

using commutator in armature winding.we can change the AC
motor to DC.

Answer / dwivedi sandeepdhar

replacing commutator in D C motor we have ac motor.

Answer / anil ku nayak

by using rectifier we can change ac motor to dc.

Answer / mostafa abdel nasser

By using amplifiers

How does frequency affect KVA rating of a transformer? If a 500 kva, 500 to 250 v, 60 hz t/f used in Canada is to be operated on 50 hz in Europe frequency then how will its KVA rating change? a-increase b-decrease c-remains same

1 Answers  

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what happens if sf6ckt breaker gas pressure is high or low about the actual rating of gas pressure(5kg/cm2)

2 Answers  

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What does substation operator do in substation?

2 Answers   ABB,

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What current can be carried by 25 sqmm copper cable safely?

6 Answers   Bharti,

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In stepdown transformer 11/415 volt two nos.(R & Y)HT side fuse is blown ,what will be voltage of ry,rb,yb in secondary side

5 Answers   NTPC,

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if there is nutral in phase why we use earthing wire and grounding? even at fault condition the fault current flows to neutral (it is a lower path)

1 Answers  

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why do we need to use 3c+3e cable, normally i select only 3c+e cable and i think it is enough. pls explain the usefull of 3e cable ( in this project the earthing system is well done)

0 Answers  

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While starting a high capacity motor, it takes 6 times the full load current. Why it doesn't trip relay or CB's in that network?

4 Answers  

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Why no-load primary current is very small as compared to full load current in transformer (as 1% of full load current?

5 Answers   NTPC,

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can anyone plz tell me in 3 phase induction motor, whare we use STAR CONNECTED MOTOR and whare we use DELTA CONNECTED MOTOR

3 Answers  

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WAT IS MEANT BY COLD AND HOT START OF A MOTOR?? HOW DOES IT AFFECT A MOTOR'S PERFORMANCE??

4 Answers  

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CAN ANYBODY PL TELL ME WAT FACTORS CAN CAUSE UNDERVOLTAGE ON A BUS??? PL LIST ALL THE REASONS WITH SOME EXPLAINATION

3 Answers  

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