Answer Posted / l.chandrasekhara reddy

Grounding is used in US Electrical installation Standards (NEC,UL)

Earthing is used in European Electrical installation Standards (IEC)

How REF protects transformer alone? explain with diagram.

1482

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what is a bus post insulator? explain its application in a substation.

12516

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what is the IPC ? & what the uses ?

1438

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The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.

1909

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Installation method of self treated earth electrode.

1973

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please send me previose rrb junior engineer qustion papers

2089

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how to select the double earth conductor if 21A full load?

2003

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WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?

4323

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1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

8001

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

2273

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We have two parts in generator, electrical & mechanical. how it works?

1896

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can we use trip light with bus coupler?

1870

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what is the meaning of number in (11, 31, 61,14, etc. CDG11, CDG31, CDG61, DDT32

1374

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what is the difference between capacitive and resistive voltage divider?

3438

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there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit

1872

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