Electrical Engineering Interview Questions
Questions Answers Views Company eMail

If we have a 2000kva load,How much kvar capacitors we go to add to improve the power factor at 0.9?pls give the calculation and fully theory?

ABB, Unitech,

2 6428

what is the kva rating of 20 kv transformer?

1 4054

WHY RATING OF VCB NOT LESS THAN 630A

1994

Hi, what is the temp of bus bar.

1 2992

How many types of Differential protection are there? and what the special arrangement are made at the time of charging of a transformer on the Differential protection?

1 2074

Why DC exitation to AC Generator? Why not AC?

Equate,

2 5425

Which type starter is used for synchronous motor?

Equate,

2 5932

What is infinite Busbar?

Equate,

4 14437

Why neutral point is consider as zero potential?

Equate,

2010

What is Nominal voltage?

Bhel, Equate,

3 8489

What is floating earthing?

Equate,

2 5225

What are the different methodes for calculating the short circuit Current?

Equate,

1475

What will be result if we connect LT votage to the terminal of HT motor?

Equate,

1688

What will be result if we connect LT votage to the terminal of HT Transformer?

Equate,

3 5177

How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

Equate,

2 5393


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Un-Answered Questions { Electrical Engineering }

What is Tachometer used to measure?

714


What are safety device in vcb and acb?

3229


what is the star delta connetion and how can do it a three phase motor with control witing with picture

1775


size of condotory fron voltage level

1688


What happen to the transformer if the OLTC frequently used for lower and raise occured 50times daily?

1541






Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

1725


Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above

1719


I am applying for NTPC examination.Can we please provide previous paper to my mail prasad.chintala108340@gmail.com

1705


List the power rating of any 5 important electrical appliances used in houses.

1541


If 22 KV HT line, Current transformer is 25/5 then how to calculate multiplying factor.

576


what are the values of VRY,VYB,VBR,Vry,Vyb,Vbr,Vrn,Vyn,Vbn for Magenetic balance test of 100 KVA and 63 KVA Distribution transformer

2387


I HAVE A 50A MCCB AS PER DESIGN LINE WIRE CONNECT UPWORD SIDE AND LOAD IS CONNECTED TO DOWNWARD SIDE TO THE MCCB.IF NOW ANY ONE CHANGE SUPPLY & LOAD(WISEVERSA) WHAT HAPPENS ? DOES MCCB OPERATION OR WORKING FUNCTION NORMAL IF YES THAN WHY THERE ARE MARKED LINE & LOAD ON MCCB.

1894


How they LT panel busbar size choose

1231


What is the formula to calculate the no load current of a single & three phase induction motor

1738


How much load can be taken for chiller from 1500 kva transformer

835