Electrical Engineering Interview Questions
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Why dont we get shock while testing for voltage with a line tester? How the bulb inside the tester glows while testing with tester coz we are totaly isolated from earth or we are not giving close path for the current to flow?

3 14503

What is the operational principle of direct current current transformer and direct current potential transformer?if possible plz reply with ckt. diagram.

1 3849

i am BSEE student, my project study is to synchronize the generator of an hospital, it have a one 313KVA standby-power diesel gen.,and three 100kva transformer.The generator system is operated manually and no ATS or UPS. one more new building is being build so the transformer will be upgrade to a higher vale. 1)how i can connect the new gen. to the old gen. and to the synchronize panel? 2)what is the new gen. to be buy?(rating, etc.) These is my title: To synchronize the generator system of the ____ Hospital. Anyone have a good title? Thanks.

1 3033

in a dc motor we supply current only to the armature conductors,from where is the field winding gets excited then??

RRB, Siemens,

3 4765

please send me previous year questions of jspl through which i could prepare myself for the test.

1349

Is there any option to replace two Genset of capacity 125KVA with one higher capacity for same office?

8 7011

1)which height building required lightning arrester? 2)how to calculate the requirement of lightning arrester? 3)what is the pro instrument? 5)how to test protective relay like overload?earth fault relay?

1 15508

How can you calculate in detail the VA burden of current transformer used for Restricted earth fault protection? Please understand that the CT required here is Class PX or X. Also please show the calculations for knee point vtg, stabilizing resistor, magnetising current.

3 15473

Why we are not using capacitor in line when load on Genset?

3 6613

what is phase voltage and phase current what is line current and line phase

L&T,

3 5546

What are the methods/types of distance protection schemes used in transmission system?

2 7093

can you plz send l&t aptitude questions if available its urgent plz plz plz

HPCL,

1627

what is the significance of terminal voltage and phase sequence in the operation of paralleling of two generators?

2001

WHAT ARE THE CHARACTERISTICS OF AN VOLTAG AMPLIFIER

1579

why doesnt the back emf hold the speed of unloaded series motor?

1 2496


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Un-Answered Questions { Electrical Engineering }

Differenciate between circuit wiring and sub main wiring with illustrations

1736


hi can anyone pls tell me the eee interview core questions asked in l&t

1521


3- What is the target from Zero Impedance, Single Phase Imp., S/C Imp. and magnetic balance tests?

1364


Parts of machine and their discription in details with suitable photo

1609


What type of a DC motor would you use for a lift?

646






what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor

1633


how to find the multiplication factor for digital energy meter and analog energy meter

1740


why actual valve timing diagram is different than ideal valve timing digram of a 4 stroke engine?

5023


How to findout raw or ups power? its not indicated in socket,

1522


What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.

875


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?

1641


what is maxemo work permit procedure

1651


what is the difference between electrical and electronic choke?

1448


The ripple frequency in output of fullwave bridge rectifier is a. Half the input b. Twice the input c. Same as input

1788


what is the safe meggar values for motor, transformer HT, LT and Cables? IF we want to replace I/C bay at our 220 kv substation which is of 140 mw load capacity bay to be replaced by 400 mw capacity bay.other than CT(1200/1) what are the other equipment i have to replace. why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero

1790