Answer Posted / saravanan.s.r.

Starter is mainly used inorder to reduce the HIGH STARTING
CURRENT and to protect the electrical equipments.at the
time of starting the slip=1;speed=less; hence the rotor
resistance value equals '0' due to the relation r2(1-s)/s.
there is no back emf,such that it draws a high starting
current.It may lead to damage the equipments in motor.hence
to avoid this starter is used.main types of starters are
1.Direct On Line starter.
2.Auto Transformer starter.
3.Rotor Resistance starter.
4.Star - Delta starter.

what are the application of over current relay?

5273

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High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

2109

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Keywords: Die, Card, Coin, B/N 2 To 12

1289

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explain working principle of earth leakage relay

3716

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Why we use Electrical energy rather than any other type of energy, mostly? Explain behavior of open secondary CT and short circuited secondary PT in energized condition?

1881

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how does commutator convert a.c to d.c?

2212

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write down the formula of cable size in RM if current is 50Amp.

1350

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Which level of the Transformer oil got dielectric strengh? And why?

2261

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why is control bus bi-directional?

2172

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Define cuttoff frequency?

1078

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I have 1500/1A CT If i connect this CT in 6.6KV bus bar means what will be the voltage present in CT?

2007

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What is the function of NGR for the parallel operation of alternator? whats happen when different rating of alternator are running with parallel?

2993

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how to convert lv line to hv line and viseversa, any losses will occur during this process

2080

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if any house we instaled a 1.5 ton ac and its phase cable of wiring is installed but netrual cable of wiring not instaed. my question is that is neutual of house(for other wiring is capable for ac load or a sepeart neutrual wiring required

2480

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in a silicon diode we can measure .7v in a voltmeter.but why we can't use this voltage for using?

1928

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