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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is center gravity load in substation?

 1925

why transformer neutral and CT Secondary neutral is connected to earth?

NCC,

3 3547

What is the main difference between generator and alternator

 4 3483

How to calculate current carrying capacity of copper conductor _ such as cable size 25sq mm,50 sq mm, 75 sq mm, 100 sq mm

 2 3344

What is the difference between diesel generator engine with and without turbo charger with the same capacity?

 1184

what is PDU in transformer?? which company manufacture??

 1365

a 440v 60hz 03 phase 100kw generator can deliver how much power in kw for 220v 60hz 01 phase load?

 1 1723

can we use the 110 v primary Tr 240 v secondary step up Transformer as reverse 240 pri 110 sec

Hyundai,

3 3190

Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs. Sir, My question now when my mind strikes with 2 options 1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or 2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2 Please suggest me sir

 1420

how ups works ? various parts of ups and working principle

Serco,

1461

Explain Power factor in simple words

ETO,

1 3481

Describe Non I.S. Earth System and why is it used?

KPJV,

1288

Why lose 1 phase voltage in 33kv to 415v stepdown transformer

 1304

why wire sizes are 3/29 or 7/29 and why not wire sizes are 2/29 or 6/29?

OGDCL,

4651

why generation voltages are 6.6kv or 11kv and why not some one give that stander that generation voltages are 5kv or 12kv?

AES,

1 3222

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Un-Answered Questions { Electrical Engineering }

What will be the voltage impact on secondary side of two transformers with different vector groups when both voltages are compared.

1506

how does commutator convert a.c to d.c?

1758

What is the meaning of loop in transformer

1187

In AC if the direction of current keeps reversing every half cycle, how does it propogate through the transmission lines?

1631

explain different types of d.c motors?

703




What is reactive power and where it is used.

1182

What is meant by analogous system?

756

how could we know the size of cable by physical view?

1205

Classify drilling machines.

677

What is the effect of interchanging core(made of steel) and winding(made of copper) material in case of transformer? Give proper explanation in regard to different losses in transformer.

1421

Why the power generated in dams is complex power? Why the generators in dams cannot produce Real power directly (i.e power which has zero reactive part)?

1315

what are factors comes under relay setting (distance relay 7sa52) under OPEN DELTA VTs connection??

2107

how does grading rings & spacers in transmission line works? Working Principle?

1592

State the frequency for rc phase shift oscillator?

578

At what speed 1 HP motor can run an electric car of weighing 400 kg?

1125

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