How over load relay works.

1 Answers  

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Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

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A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?

0 Answers  

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IAM GOING TO ERECT THE STREET LIGHT.,, I NEED HOW TO CALCULATE LUX., ILLUMINATION.,AND ALL

1 Answers  

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what are the types in Relay?

1 Answers   PLA,

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how to calculate the current carring capacity of the conductor

1 Answers  

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what is the working of vfd drives.

2 Answers  

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In step down transformer (415/200V),mistakenly secondary side is connected to 415V for some hours, what would be result of this condition?

19 Answers   Essar, GAIL, Vizag Steel,

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What is cogging and crawling phenomenon in motor.

2 Answers   DAE,

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Is reverse power relay of generator operate due to voltage variation problem? please clearify.

1 Answers   Birla,

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What are IR values and what it should be for coil and for insulator

0 Answers   GPSC Gujarat Public Service Commission,

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A 2D array X(7,9) is stored linearly column wise in a computers memory.Each element requires 4 bytes for the storage of the value.If the first byte address of X(1,1) is 3000,what could be the last byte adress of X(5,8)?

2 Answers   TCS,

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