Answer / s raghavendra

for different types of applications different kinds of switches are required . for starting of induction motors especially 3-phase squerriel cage induction motors at start it consumes more current to stop that we keep the switch in star position and after it attains 70-80percent of rated speed switch is kept in delta mode as already backemf will be generated which reduces currrent and like this there are many applications......................................

if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.

0 Answers  

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1 unit or 1 kwh means how much kva

7 Answers   TATA,

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why phase always came one direction in 5pin socket(right hand or left hand) which direction and why..........?

4 Answers   Alstom, L&T,

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1. How many types of mangers? 2.How many types of capacitors? 3.pls tell me normally types alternator problems?

0 Answers   APCPDCL, Voith,

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In three phase, phase to phase voltage is 440 Volts, but the three phase motors are designed for 415 Volt, 50 hz, why

1 Answers   Shree Ram, Shriram, Sri Ram,

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What happened when voltage will half value of current ...

0 Answers   SCL,

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what are the safety measure & controls in engine?

2 Answers   RRB,

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Why ideally the internal resistance of voltmeter should be infinite and of an ammeter be zero

2 Answers  

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Do inductive loads have distorted current waveforms ?

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What is the use of lag compensator?

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Mention what are the types of semi-conductors?

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How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

1 Answers  

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