Electrical Engineering Interview Questions

why AC voltage source are generate as 50 Hz ?

5231

What will happen if induction motor is supplied with capacitive load?

NTPC,

4627

how we identify between current transformer and potential transformer without having it name plate?

L&T, TATA,

11050

Please give the formula for converting from 1 tr refrigeration to kw.

3606

what is settable hystersis protection? If any body knows plz kindly post the answer..

1610

what is the formula for computing cable tray size & capacity

1763

what clearance required for 4.5 mva dry type transformer?

SPS,

1671

how to calculate lighting for a room

6735

How can we select suitable capacity generator for three phase load (inductive load) and how to take study analysis in 3 three phase load system ?

1718

A group of machines (wind turbines) connected with 33KV feeder and each machines are having individual VCB. The 33KV feeder connected with 110KV/33KV substation. The 33KV feeder tripped by over current at Substation and fault recorded at Substation as OC-R&Y phase. Same time the group of machines VCB tripped by over voltage, the fault recorded voltage was above 66KV by numerical Under/Over voltage relay. While grid drop time, this much of voltage hike is possible?

2780

method to check earthing

ECC,

10142

why slipring motor , at full speed run as squirrel cage motor?

3370

I have running 4 generator in paralel.All generators Voltages is same(470 V),KW also same (100 KW) but only No2 generator Amper is high than another generators. DG No:1,3,4 470V,100KW, 150 A DG No:2 470V,100KW,400 A

4428

What is the permissible value of earth resistance and as per which standard / act / rule ?

5587

The loads are connected with phase and ground then why current flow as the loads ?

1530

Un-Answered Questions { Electrical Engineering }

iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

1820

tan delta equation test on alternators

1806

Can an inverter be used as a converter? How?

1521

How does a digital electronic meter work??????

1655

what is the difference between earth leakage and earth fault?

1794

What is the difference between DOL starter and star delta starter

627

Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.

1295

What is earth?

1839

WHat is the general checks required for Dry type transformers

1695

HOW TO CALCULATE EARTHING SIZING?

1610

what are the analog quality input for protection function?what are minimum reqiments?

1462

The capacitive reactance of a capacitor of 1/(2(PI)) F at 10^3 H is

1461

how to get electrical supervisour certificate in gujarat

1569

List the advantages of star-delta starter with induction motor?

663

What descriptive information does the NEC require to be marked on all conductors?

1509