Answer Posted / engr. l. o. osuji

Further to my answer,note that a ground fault at the
distribution S/S must be sensed fast by the relay so as to
trip the disribution cb before the cb for the 132/33kV in
the Transmission S/S is trip by its relay as a back-up.

what is strip power factor?

2140

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why cable i burning without tripping. how can protect led street lights

1544

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What is 11 N1 and 12 N2 in single phase Transformer ?

1919

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briefly explain principle of resistance welding

1842

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Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes.

1130

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What is the one main difference between ups & inverter ? And electrical engineering & electronics engineering ?

1132

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Define closed loop control system.

1067

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Brushes are placed at magnetically neutral axis,when brushes reach that point,the armature conductor gets shorted,but it can be seen that the dc supply is also shorted,wont that get damage? help me plz

2280

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on a three-winding transformer relationship delta-delta-star, on third winding why the relationship is a star? what are the advantages and disadvantages? Thank you and please help

1719

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A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.

2495

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Is phenomenon of resonance is harmfull fr the machine? if not or if yes please explain it?

1913

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Do you know what is dry-out test in x'mer

2632

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critically criticize the application of ring main unit in power system

1439

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In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring

1939

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where lt & ht capacitor used

2212

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