Electrical Engineering Interview Questions

HOW TO CALCULATE LV CABLE SIZING?

L&T, MRF,

7447

HOW TO CALCULATE EHV CABLE SIZING?

L&T,

9688

WHAT IS THE USE OF EARTH SWITCHES?

L&T,

65925

HOW TO CALCULATE CT AND VT RATIO IN PRTECTION AND METERING?

25247

How to calculate % Impedence?

ISRO,

7508

In Railway,why we are used HT Line 25KV ?.why we are not used 11KV,33KV and others for This?

38713

why dont we connect the two 12 V DC batteries in parallel, for an inverter (UPS)? is there any harm ?

7500

will we have to design the UPS differently for both i.e. if we want to connect the two batteries in parallel and/or we want to connect the two batteries in series ?

5440

what is neutral ground resistance relay? how it is helpful in protecting system?

7530

how to calculate of which rating transformer should be selected? take any example

5410

in a 740 kw dc seperately excited motor field voltage is constant about 17.4 volts and armature voltage is500 volts dc. how it is possible to have two different voltages from single transformer of output voltage 500 volts? if any difficulty in question contact ajitsingh.kadian@gmail.com

3884

is it possible to step down voltage of single phase from a three phase sysem? explain

3500

how does ELR works? explain

2203

what is diffrence between primary & secondry transformer?

5097

IS there any mechanical connection between the field winding and armature winding of a dc generator?

IOCL,

13704

Un-Answered Questions { Electrical Engineering }

If a 3 phase induction motor is in off condition in the conveyor and rotor of the motor keeps moving with the conveyor than the resistance of windings of motor varies. why is it so ??

1592

The principle of switching circuits for different types of batteries in application of storage systems

1566

Is it a better option to procure screw type air compressor rather than reciprocating air compressor?If so, what is the reason?How should we select an air compressor(100 CFM)? Please mention the important parameters of air compressor.

1570

What is mean 2XWY

2035

what are the advantage and dis-advantage of 3 phase 4 wire energy meter?

1506

How to define Kirchhoff current law and voltage law along with simply examples.

1283

why 3 phase is converted into 2 phase using electronics circuit why not 2 phases are diresctly putted from the 3 phase transformer??

1729

why we dont prefer ac voltage controller instead dimmerstat [if both have same rating] for conducting experiments in laboratories?

1745

How PADO software increase the efficiency of power plant?

6036

Why generation voltage in thermal power plant is between 11kv to 33kv?

665

in Telecom DC system-why positive +ve is made earthed.and - ve is fed to load.

2199

Which type of motor is used in trains, what is the rating of supply used explain working principal?

837

Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

1435