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Electrical Engineering Interview Questions

why the carbon brushes are used heat created rotating parts in eiectricity

1904

What is the technical difference between IS:1554 and Indian Railway IRS:S63/2007

1358

This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

2689

why we are connecting the alternator to a steam turbine of higher RPM then the rated RPM of alternator? For example:( connecting 1500 rpm alternator to 7600 rpm steam turbine). we can directly connect the same rpm turbine to alternator know??? is there any special reason ???

2955

what is the meaning write of AC1,AC2,AC3 .....power contactor

ABB,

27829

why does in transformer the v/f ratio constant?

TATA,

7714

Why are we not getting shock while touching a metal which is being welded?

1421

What is the basic principle of welding process?

1142

WHAT IS THE MEANING CREEPAGE DISTANCE

2732

why the vfd motor take current high in vfd panel then mcc panel.current in vfd panel=160A in 93%.and mcc panel it shows 130A. (132kw motor)

2089

how to calculate the earthing conductor & no. of earth pits required

10820

how to calculate the lightning arrester conductor @ no of earth pits required

1119

what is relation between motor poles & motor current in 3 phase motor

1971

how to calculate the earth fault current

1460

whats relation b/w motor current & friqency

2205

Un-Answered Questions { Electrical Engineering }

Minimum IR value of 1.1 kv grade 3.5c (300, 240,185,150,120,95,70,50,35,25) sqmm Aluminium XLPE cable and 4c (16, 10,6 & 4) sqmm cu arm cable between RY,YB,BR,RN,YN,BN,RE,YE,BE & NE.

2274

What happen when change order of CT in GIS feeder?

597

What is value of earth resistance required for substation and equipment earthing and what are the reference guidelines

792

-How do you select cable size for a given load at a given distance from source of supply. How do you find voltage drop.

906

what is the difference between electrical choke and electronic choke?

1621

why capacitance effect is predominant in underground cable transmission and inductance effect is predominant in over head line transmission?

2613

What is meant by celling voltage & current in excitor ?

1092

What is the actual meaning of thermal power efficiency ?

1132

how the works electronic energy meter?

1191

why do we not use equivalent voltage source in negative sequence equivalent ckt.

1171

What is instrumental error?

161

what is the necessity of under ground cables ??

1100

working function importance of mdc meter

1230

How will polarity test of Dy5 Transformer ?

1195

in my industry we are using 3 step up transformers for induction heaters..i.e 415/580v and other are 11/440v.in power consumption does a step trnsformer makes any difference compared to step up?? plz explain

966