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.

1657

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 3111

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

Cummins,

1 3844

how to select battery for 15 KVA UPS with formula

2016

Disadventage of cable-gland earthing if any ?

1578

why dc series motor high speed motor

3 3663

how to calculate neutral current in three phase four wire system

Auto Meters,

1 3367

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 2359

What should be the BDV value of a new transformer oil

3 6179

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 2847

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 3876

what's the activities of reactor in Buchholz relay?

Yahoo,

1 3689

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 4161

Why starters are using the machines???

Alstom,

5 6551

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)

1349


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Un-Answered Questions { Electrical Engineering }

what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)

1244


how to calculate compresor capacity?

1586


is it possible for different brand of H.V transformers to run or operate in parallel to each other? if so how much disturbance can this affact the H.V bus bar?

1579


How to calculate Grid rotor resistance(GRR) losses in slip ring induction motor?

3418


What is deference between MCB & MCCB & ISOLATOR

1380






Initially, when the input is not equal to the output — what type of response is this?

587


How many devices can be connected in one zone of FACP

1721


why we use sinosidal voltage / current instead of others in system?

1548


Explain the different methods used in the choice of rotor slots for reduction of harmonic torques in an induction motor.

1481


what is current check gurd relay?

1936


how to compare with Relay settings for HT< panels, RMU panel, and PSS CSS transformer?? 1) Load amps, 2)Tripping time, 3) CT ratio, 4)Cable size 5) Transformer KVA rating 6) transformer full load amps

601


what does a string of resistors in a series will do?

660


Why we are use dol starter up to 10 hp

884


A 3 phase transformer's (Y-Y) Y and B phase is (Y and B connection not broken) broken from neutral and R and Nutral connection is ok, what will be the relay tripping and why

1412


What are marginally stable systems?

596