Electrical Engineering Interview Questions

what is difference between AC VVVF drive & Dc VVVF drive explain their working principle?

42924

why we step up voltage for reducing the loss, even if voltage and current are proportional anr resistance remains same

24621

how to select earthing conductor size of amy motor/panel etc.

Sony, VBB,

9290

How would we calculate the no of earthing pits required for motor /panel

22573

send me the upsc conventional papers of 2006

3066

what is cogging and crawling

78717

for 500mw power production how many range of transformer set in unit please reply if three transformer use .

5852

What is power factof?

RRB,

21351

What is auto transformer?

54708

Why donot sleep below the tree for night time?

24777

could mail me the question papers for the test.

ONGC,

3286

What is Cement

17261

why the generating voltage in India is 11kV or why is it be transmitted as multiples of 11

111558

why electric shock due to dc is dangerous than that of ac

57032

What is the difference between online ups and offline ups?

205582

Un-Answered Questions { Electrical Engineering }

What is the meaning of C1, C61, C91 cable

2700

What is the minimum IR value of HT/ LT cable? Pls post separetely!!!!!

1850

from generating station If 400v LT line length is 1000m how much voltage is drop and how do i calculate it? which cable will be use for this line?

1477

What is distance between electrical panel to land ?

816

While performing stability test of differintial cts how to know the voltage and current on both side of the transformer?

2972

If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

605

what is meaning of sympathetic tripping with respect to relays and give the values for current carrying capacities for copper and aluminium cables from 16sq mm to 500sq mm

4262

How do we arrive at selecting reactive capacitance value as 30% of h.p rating of motor?

1291

can i use ups power as a raw power for another ups

1386

ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?

1432

how to failure indution motor insulation & how to improve heat in motor insulation

1344

if grounding is notdone at regular intervals for long distance transmission, will the load connected at distribution end receive voltage during negativehalf cycle of the sine wave?

1475

How much dc volt applied in cathodic protection system?

1765

how to revers the direction of single phase motor

370

explain why core loss of a transformer is almost constant under different load conditions when connected across a constant voltage and constant frequency.

2122