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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Difference between a pilot wire and a normal conductor?

United Arab Aluminum Company,

1356

How to reduce current flowing in neutral due to unbalanced load conditions in a three phase system.

IOCL, wbsedcl,

1 3253

Why current transformer is earthed??

2 3627

why when i start my diesel generator it takes 1 minute or less then stop, and i checked the oil sensor is ok and when the generator start i can get 220 voltage but it it is stop after 1 minute or less, how can i solve this problem?

1 1663

what is compatible kva for 3300 watts and why

FoodBev,

1 2161

What is the value of system voltage?

Bhel,

2 3582

What is difference between MCC,PMCC,PDB?

Cipla, JSW,

2 33350

(1) From the following option, which option is correct for largest size transformer.? a)1KVA,25Hz , b)1KVA,50HZ , c)1KVA,60Hz , d)1KVA,100Hz

Torrent Power,

5 6330

Why ct secondary is not kept open while primary charged. Answer in terms of ct parameters.

Power Grid,

4 4597

What type of surgery impedence with 200ohs 

1 1336

suppose i have two single and three phase induction motor,thier have not any rating on its panel,anybody can tell me which motor is single or three phase?

Doon,

1 2167

why chock were used in old tubelights but are not newest tubelights?

1198

Differnce between negative Pahse SequenceFunction and unbalance Function?

Atsco, LMW Lakshmi Machine Works Limited,

1129

What is the name and type of power transformer oil?

4 3729

what is the full name of ELCB &MDB 2 3454



Post New Electrical Engineering Questions

Un-Answered Questions { Electrical Engineering }

how to calculate transformer load?

1784


Why GRR starts from 60% of motor speed why not less than 60%?

285


what happens to the supply voltage if there is any change in frequency?

5350


If we want to change a contactor of faulty one what are the conditions want to fullfil

1385


I need the list of Universities who have summer intake for BS degree in Electrical Engineering.?

1399






why u r living from presentaly working.

1727


Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?

1212


how to calculate current and voltage in a same circuit?

1505


What difference between ref protection and differential protection ?

1173


What are the advantages and disadvantages of open loop control system?

488


We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

1452


What information we need to prepare relay coordination chart

1666


IF I KNOW THE AREA OF CROSS SECTION OFTHE WIRE , WATTAGE OF THE LOAD ,VOLTAGE SUPPLY WHAT IM GIVING TO THE LOAD AND ALSO POWER FACTOR OF LOAD ....... SO GIVE ME FOR WHAT AMOUNT OF CURRENT I SHOULD USE WHICH TYPE OF CABLE?

1271


why different series of vfds (like allenbradley)are used in industry ?

1641


how to calulate short circuit current for the following: 1.cable connecting 11KV of 22KV/11KV transformer to 11Kv of 11KV/415V transformer 2.what cable size should i use.

1472