Answer Posted / surendra

dc motor works on principal of f.left hand rule and force is given by f=BIL.B IS PROPORTIONAL TO voltage if supplied voltage is low machine may not get required force to rotate, hence it won't rotate

Brief me about maintenance planning & sheduling of machine tool.

2139

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Why power factor should not be in leading (capacitive) mode of any load.

7054

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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

1970

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Mention the difference between Analogue and Digital circuit?

1144

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What is the function of under voltage release ?

1437

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What is the necessary and sufficient condition for stability.

1146

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can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?

1739

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Please give me a erda placement paper

1808

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1.what is difference in maintain Hz again Hz in USA ? 2.how to calculate the battery AH? 3.why are yearly maintained in transformer how many tests in required?

2785

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Percentage losses in power generation?

3000

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how does it help for selection of a transformer.

1867

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How we can come to know the substation range,without go through any name plate ?

2120

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i have some screw comprressor with 630kw power,i have established them with simple star to delta circuit,by the way there is so much inertia when the screw comprressors start, can you offer me contactors power with 400vac or any cataluge to choose the contactors

1866

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What is the types of HT motor testing

3600

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How to detect voltage vector shifting in interconnection protection.

1911

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