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.

1819

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 3335

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

Cummins,

1 4120

how to select battery for 15 KVA UPS with formula

2176

Disadventage of cable-gland earthing if any ?

1772

why dc series motor high speed motor

3 4103

how to calculate neutral current in three phase four wire system

Auto Meters,

1 3620

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 2612

What should be the BDV value of a new transformer oil

3 6591

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 3283

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 4324

what's the activities of reactor in Buchholz relay?

Yahoo,

1 3910

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 4527

Why starters are using the machines???

Alstom,

5 7129

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)

1512


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Un-Answered Questions { Electrical Engineering }

Why power factor should not be in leading (capacitive) mode of any load.

6086


how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.

1841


hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?

1524


DRAW ACIRCUIT DIAGRAM OF 100 KVA 415V/55-0-55V DELTA TO STAR TRANSFORMER

1721


what is doubling factor in making current of a breaker?

1675






what is the chemical name and formula of refrigarent R-134a.

1870


how can we select the type of wire.what factors we have to look on it , do we have some formula to calculate it. please guide me on it

1595


What is UPS and How do you maintain the UPS Maintenance? Brief Description on UPS maintenance.

2219


Explain the working of variable frequency transformer?

741


At full load wat is the motor p.f And at no load will is the motor p.f?

1810


What is the difference between solid grounding and impedance grounding?

1638


explain with diagram how to protect transformers and substations from over current with help of CT's?

1598


how to calculate the settings for shaft ct protn in hydro generators

1593


what is the minimum requirement gigaohms for the insulation test using 5kv in 300mm xlpe cable

1626


LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

2527