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Electrical Engineering Interview Questions
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Hi My dear all Friends, There is a question regarding HVAC Engineering and widely used in Power Projects. Question- What is the diffrence Between REF, SEF and Differential Protection....???? Where REF - Restricted Earth Fault SEF - Senstive Earth Fault.

1537

Hi My Dear All Friends, There is one question it is widely used in Power Project's High Voltage Engineering. Question- What is the diffrence between Earth fault and Back up Earth Fault....???? . . . . . . Have A Good Day

1 2971

HOW BETTER VOLTAGE REGULATION IS OBTAINED BY HIGH VOLTAGE TRANSMISSION....?

Cummins,

1 3679

how to select battery for 15 KVA UPS with formula

1901

Disadventage of cable-gland earthing if any ?

1426

why dc series motor high speed motor

3 3418

how to calculate neutral current in three phase four wire system

Auto Meters,

1 3194

During Load testing of battery charger with temporary AC Generator .When reach 70% load Generator immediately shutdown .we could not able to Recognize ,what is exactly problem .Please kindly clarify us

1 2209

What should be the BDV value of a new transformer oil

3 5895

When we are working on transformer(132\11KV). we are going to isolate the transformer from both HV side and LV side. then we are applying grounding on both side. My question is that we required to isolate the VT which is still connected from secondary side.?

1 2700

i am iti student i have project to do. that IS 100MW 220\33KV SUBSTATION I WANT TO KNOW HOW TO START, LIKE CALCULATION, WHAT RATING OF CT,CVT, PT, ISOLATOR LIGHTING ARRESTER WAVE TRAP CIRCUIT BREAKER IN 22OKV SIDE, ALSO TO WARDS 33KV SIDE PLS HELP ME WITH THIS, THIS MY LIFE NOW, I KNOW AUTOCAD, I LIKE TO KNOW HOW TO CALCULATE ALL THE THINGS

3 3572

what's the activities of reactor in Buchholz relay?

Yahoo,

1 3513

CONSIDER A 415V/200V STEP DOWN TRANSFORMER.CAN WE USE USE IT AS STEP UP TRANSFORMER BY GIVING 200V IN SECONDARY AND TAKING OUTPUT FROM PRIMARY?

3 3895

Why starters are using the machines???

Alstom,

5 6093

What should be the magnetic balance test values for a 3 phase delta/star connected single primary dual secondary winding transformer (90 MVA / 2 X 45 MVA TRANSFORMER)

1267


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Un-Answered Questions { Electrical Engineering }

How can you sized or estimate the ligthning arrester current rating?

1441


R=*ΒΆ l/a

993


What is the Surge suppresor? Why using in a UDB's and How it works?

1485


What are the parts in a inverter?

1401


what is subtransient , transient and steady stateac components

1544






Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?

1620


what is Anti-pumping?

1321


What is power distribution criteria for converting single phase unbalanced residential load to 3 phase star connected balance system. Does total KW converted to 3 Phase. Means Divided by root 3.

1655


Why the arms of delta in a delta-wye power transmission system are kept constant??

1255


Dear All we are having a problem in G120 BOP showing alarm A0503, F0052, F0060 we can not remove fault alarm ,Please any body help us. kowsar

1028


How to do maintenance of transformer feeder.

1156


How can we choose the rating of submersible motors

2007


Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction

2292


i have 3500 amp load and select current transformer and perches.how i calculate .please understand

1526


what is mean by PIR in circuitbreaker and give me detail of that?

2931