Answer Posted / dipeandra deepak

normly earth res.value for an industrial area is 1 to 5
res.for rock sail area and residential area, this value is
8 and 1-3 res respectively.further ithink this depends upon
ur mant. capability. this can be maintened by checking
earthing pit time to time. it also depends the size of
earthing patti and the load capicity set against it.

for 100 HP Induction motor service factor is 1.2(SF) we placed a VFD at the motor side load is balance with 0.3 Amp's Phase to Phase but at incoming of VFD load is un-balance with 10 to 20 Amp's what will be cause of load un balance

1636

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1. What is maximum permissible distance between smoke detectors ? 2. How do we decide number of smoke detectors required in a large office, warehouse, hall etc ? 3. What should be maximum height of smoke detectors ? 4. Where do we use heat detector, optical smoke detector, temperature sensitive detector ?

2489

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diff. between tension mode & speed mode

1884

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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?

1680

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why we used dc supply for field in dg set

2033

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what is the difference between transformer,converter and transducer

1256

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what transformer we used normally and upto which kva?

1613

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what is the current setting for different relay protection for transformer .

1843

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hi i will D.E.E.E.is completed pls send rrb diploma old qustion papaer sent in my e mail. i.d.

1963

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Why we use auxillary relay ? what is function of differential relay, directional o/c relay?

1734

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How does an oscillator differ from an amplifier?

760

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what will happens if one phase is missing for 33/11kv power transfomer and why?

2295

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How to decide CT & PT ratings for a given transmission line carrying some rated voltage?

1966

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mccb service sittings be done?

1461

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why we have and use 3 phase not 2 or 4 or other in power system?

1777

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