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Electrical Engineering Interview Questions

IN THE CASE OF AN ELCB, IF THERE IS ANY UNSTABILITY BETWEEN PHASE AND NEUTRAL IT MAY TRIP. BUT MY QUESTION IS WHEN A LOAD IS CONNECTED IN BETWEEN P AND N, THE LOAD CONSUMES SOME POWER AND THERE IS A DIFFERENCE IN NEUTRAL WITH RESPECT TO THE PHASE. THUS ACCORDING TO ME, THE ELCB WILL AUTOMATICALLY OPERATES WHEN EVER THE LOAD CONSUMES-- I KNOW IT IS WRONG. BUT THE SOLUTION IS?????????

KSEB,

2776

while we select CT, why the CT ratio is divided by 5?? ex:250/5,15VA,CLASS-1 CT.Why it is divided by 5??Help me please

3306

Capacitor panel CT is normally fixed on Y phase of the main panel.why???

6000

what is the step by step formula for calculating bus bar phase and neutral size of a panel board.suppose the incomer of panel board is 100A..???step by step answer please

2399

what is the function of capacitor duty contactor in an capacitor panel???

3175

What should be the overcurrent, instantaneous overcurrent, short cicuit current settings (i.e. how many times of motor full load and what is the time duration) for a motor?

1398

12.5 KVAR capacitor 440V gas filled, Its used for windmill purpose, How can i know about microfarad value for this capacitor

3059

I know the Capacitor value- 12.5KVAR, voltage 440V gas filled, then what is the formula for calculate the microfarad value for this 12.5KVAR capacitor

2644

can i use 2000/5A Clamp meter to measure HT cable

1182

WE HAVE A PROBLEM THAT THE MAIN DRIVE OF OUR CEMENT MILL HAS AN EARTHING PROBLEM?TWO OF STATOR WINDINGS INSULATION HAS BEEN COLLAPSED DUE TO AGING PROBLEM.THE PHASES HAVE BEEN BYPASSED AND NOW THE LOAD HAS BEEN INCREASED.WE CAN'T REPLACE THE MOTOR.KINDLY HELP ME BY GIVING SUGGESTION THAT HOW TO MAINTAIN THE STARTING TORQUE AND CURRENT FOR HIGH LOADS.

ACC,

2543

RATING OF LIGHTENING ARRESTER FOR 11 KV LINE IS 9 KV is ok ,but haw to calculate the KA rating?

986

Kindly give the brief explanations for checking 12.5 kvar 440V, 25 KVAR 440V, 12.5KVAR 690V, 25 KVAR 690V capacitors microfarad values. what is the microfarad values for the above four type of capacitors, and give the formula explanations briefly. I know F-50HZ, voltage, and capacitor.

3463

why any normal motor have to provide star & delta winding distribution during starting?

2844

Why phase sequence must be same in any ht motor or generator circuit?if phase sequence doesn't same whatever will be affect on circuit?

1337

what is meant by neutral compensation factor and where it is used

1074

Un-Answered Questions { Electrical Engineering }

does any one know where we can purchase insulation oil for high voltage oil filled cables

1434

How does a tertiary winding filter harmonic(espcially 3rd one) from entering into load system?

1031

why the rotor current becomes in steady state during high slip region? please verify with equations.

1201

Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?

966

what will be happen if earth point is being used for as a neutral point for raw power , and same will be used for ups earthing

1215

Why does increasing the magnetic flux in the main field of a d.c motor cause the armature current to reduce??

1149

Define filter?

251

give me applications of sequence bridges . (used in 3 phase un balanced systems)

1060

Which do you think is the most significant cause of energy loss in a factory?

1406

What is current divider rule (cdr)?

296

what types of cable used in underground coal mining?

656

What are reasond for high wattage in single phase induction motors

865

why on axial hitting up of air blast on hydrogen produced in oil circuit breaker,temperature rises of the core of the arc?

1012

explain the types of drives

1155

how to calculate magnetic force genrated by a coil ?

1283