Answer Posted / ramkumar

To make it less visible when seen from above (merges with the
ground colour which is brown mostly) and thereby minimize the
risk of air borne attack during wars.

Similarly grey is chosen in US and certain other countries so
that the insulator merges with the sky above when seen from
ground and make it harder to aim and shoot (prevent vandalism)

What is the range of the stator resistance of 3 phase induction motor?

1951

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What are the material used for resistor?

1153

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If I want to connect a capacitor bank on the HT side of a 11kV/415V, 3 phase delta-star distribution transformer to supply Reactive power to it..what practical specifications of a Capacitor bank that can i've??please reply..

2554

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How can ou verify the size of conductor 50Sq.mm ACSR

1995

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Trafo ratio is 11kV/6.6kv,Vector group is YND11. What will be the effect if secondary is used for earthed system.

3852

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what is magnetizing current test in power transformer

2815

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Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?

1453

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What is difference between isolator and circuit breaker?

1189

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Whether 3 phase induction motorwith 100 hp capacity , Amp 160 for which sensitive earth fault relay , type CTUM 15 can be used?

1556

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pls,send the previous year written test questions.

1961

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sir i had plane to do some project with the base of hopkinson test in AC supply its possible

1919

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diff b/w elcb and rccb

2346

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What will happen if i used 11KV earth ht kit to 11 KV / 11 KV cable termination?

1476

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How do I calculate/select Droop CT ratio for various capacity of generators?

3707

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ho can we calculate the conductor insulation value according to their ratings like voltage,current etc.how insulation value related with voltage,current and power of amachine

2159

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