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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why positive terminal of DC 48V was earthed?

1 2981

How can we measure earthing resistance test (Earth meggar) of Transformer neutral pit while in live condition?.


Why did call copper as a electrical conductor?


2 2752

why do we use spark detector inside the slip ring brush compartment 0ona slip ring induction motor?


How we can come to know the substation range,without go through any name plate ?



why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?



How can we find the breaking capacity of a Load breaker switch (LBS) fed from 11 kv supply??ex:50KA, 26kA etc???detailed step vice answer pls.


why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?

QRG Health City, Siemens,

2 5003

In an panel board if the outgoings are power plugs and motor equipments...what should we choose as the incomer of the of the panel board?? MCCB OR ISOLATOR?? Should we use ELCB protection??if so where??

2 2505

How select ELCB for 32amp. socket having quantity 12Nos. We have to do this wiring in PLANT. Please Also explain the incoming cable specification.

Gulf Industrial Services Company GISCO,


why needtwo winding LV and HV in transformer?

Organic Industries,

1 2225

can anyone please help me to find the rupturing or breaking capacity in KA of circuit breaker (MCCB,VCB,ACB etc) of HT and LT side of a distribution transformer...please help with detailed step by step answer...thank you


Why Closing coli supervision is not required for Circuit breaker.


1 4467

Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

2 2295

How to calculate earth wire load by formula



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Un-Answered Questions { Electrical Engineering }

I want to design a heating coil of 80/20 nicrome for 3.5KW please give me the calculations choosing for physical dimensions assume coil voltage will be 110V AC assume necessary conditions


After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.


A ii kv 1200 A Breaker combination fixed in a cubicle. How many ampere Fuse is required? If fuse is not using, Why?


What is online and offline ups? how does it works?


What is the difference between acs 550 & acs 850


what is advertised hop count


What is the role of feedback in a closed loop control system?


What is the difference b/w fanuc alpha series 16i and 18i controller. what is stand for i


What are gain margin and phase margin?


What are the advantages of nichols chart?


how to convert lv line to hv line and viseversa, any losses will occur during this process


what is formula to cal cute earth pit numbers and size of earth strip used in earthing?


When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt


What is the minimum underground tank size capacity considered for firefighting purpose?


What happens if the Capacitive Voltage Transformer Primary neutral is not earthed. There is a CVT between Transformer and source, and the CVT neutral of the transformer is not earthed, does it effect the transformer while charging or does it effect the transformer charging process.