Answer Posted / dr. joshy jose

Earth resistance is mwasured by using earth resistivity
meter. It is by using four probe method. Two electrodes
for potentials and the other two for currents. There are
two methods, viz. Schlumberger method and Wenner method in
which two types of electrode assembly. There are special
formulae to calculate the resistance from the apparent
resistivity we get from the instrument. There are special
software to interpret the data.

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1415

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Is vtg is controlled by the resistor? if else how much?

1646

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please tell me how a surge protector work on a DC 48Volt.? please describe briefly.

1371

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what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?

1344

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How to select a contactor? How many types of contactors are available

2732

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Why sometime AVR and sometime Booster coil is used in Alternator? what is the diferance between AVR & Booster coil due to which they are selected

2566

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in non technical way how can u define POWER FACTOR??

1369

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If there is major % of Voltage harmonics in the system, how can it be control or reduced?

1561

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Why derivative controller is not used in control systems?

647

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what will be happen if earth point is being used for as a neutral point for raw power , and same will be used for ups earthing

1611

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how to check ac servo motor

1714

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How to run a three phase motor into single phase........

1570

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best manufacturer for busbar for outdoor switchyard having double bus bar scheme, can any one share technical specification of busbar. 132kv voltage ?

1244

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ROC converges if pole and zero lies inside a) origin b) z=1 c) pole d) zero ? Explanation please? if ROC does not converges then?

2457

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What are gain margin and phase margin?

832

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