Answer Posted / nithi

good answer.

High magnetising current leads to poor power factor & the
machine draws more current ,which increases losses (core
losses as well as copper losses) ultimately the system
insulation break down -total machine failure.

WHAT IS SITTING AMPS IN OVER-LOAD RELAY FOR 1PH OR 3PH MOTORS?IF ITS NAME PLATE GIVEN MAX AMPS 10AMPS?

1805

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A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

2884

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Dear friends, i would like to know that what is the exact function of 'exciter winding' & 'aux winding' in Alternator?

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1138

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2257

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explain different types of d.c motors?

1224

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920

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How to know of any cable size if there are not written on cabl?

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1322

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