I need tnpsc AE Electrical question papers

2 Answers   TNPSC Tamil Nadu Public Service Commission,

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WHAT KIND OF LIGHTENING PROTECTION SCHEMS CAN BE ADOPTED FOR THE FLAT ROOF OF BIG DIMENSION.

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What is use of reactor..how it is help ful in electrical system .....brief explain

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What do you mean by screen of power cables?

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Whether earthmat designning is done only for sub station or it can be done for multy residential complexes also? What is the size, type & arrangement of the earth grid to be done?

1 Answers  

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It is desired to flood light the front of a building 42 meters wide and 16 meters hig.Projectors of 30 degree beam spread and 1000 watt lamps giving 20 lumen/watt are availabl.If the desired level of illumination is 75 lumen/m and show a suitable scheme.Assume the cofficient of utilization, deprecitation factor and waste light factor are 0.4, 13 and 1.2 respectively.

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How to calculate per unit impedance of transformer?

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What is the normal phase difference between the voltage and the no-load current in a transformer?

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how to calculate current and voltage in a same circuit?

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How to size Air Circuit breaker (ACB)? What is the most important factors?

0 Answers   ABC,

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what is different between synchronous & asynchronous motors

3 Answers  

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what is the difference between changer, converter and transformer?

0 Answers  

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