Electrical Engineering Interview Questions
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what is differance between PT-100 and thermocouple?

1 7400

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............


I have a table fan of Rallifan Make. When I overhauled it I found a stator winding and an aluminum die cast rotor. So it is supposed that it is a 1 phase induction motor. But there are only two terminals coming out and there is no capacitor. Can any one tell how this motor works? or which type of this motor is?

1 3508

On the secondary side of a distribution transformer, we use 1c x 630 sq mm cable. Why dont we use 4 core cables instead of 1 core cables on the secondary. Why we use aluminium cable glands on the outgoing instead of brass cable glands?


2 9967

Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?



Why we transmit the power at the voltage in the multiple of 11 or 1.1 like 11kv, 22kv, 66kv, 132kv...... some one told me that it is due to fomr factor 1.1 of sine wave. its fine but while transforming we can choose any voltage, so why only multiple of 1.1 there also.......? plz tell me.

7 6024

avr is an automayic voltage regulator ... it regulates voltage before it synchronise with grid after synchronisation it regulates power factor why....

7 7121

What is the difference between Off line UPS and Line interruptible UPS?


1 3840

Do we really need wheels for the transformer

1 2735

Is motor current is dependent on load.

2 3738

how to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor


3 13058

How o select the electrical fuse?.What are its characteristics.How to select the material od fuse?



Why only three phase power generation are load are used


2 5491

where is the need for short circuit test for 3 see is required and why? can you explain in brief with application


I want to know in body earthing which material can be use either copper plate or GI plate please guide us which is best option.

3 3961

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Un-Answered Questions { Electrical Engineering }

Is any generator is developed which is operated with out diesal or other expensive source?


What is the source of dependent source ?


What do you mean by dependent and independent voltage sources?


How to calculate the input cable rating for 10kva ups (3phase input and single phase output and also 3phase output, battery rating 65Ah)provide the formula also.thnx


Hi everyone, I'm Lachuu, recently joined automation company as PLC Engineer. I have certain basic question, I request all big gurus and seniors to answer these question. Because this will be very helpful to me as well starters like me. How to design a control circuit (ex: pick & place - my current project) Yamaha robot PxYx series controller RCX222, using 6 cylinder double acting, plc keyence kv p16r 2 expansion unit for input and output each. How to select panel terminal mcb elcb powersupply. My main concern in some projects how to select dc power supply, mcb rcb(I came across dif bt b c d curves, but stil confusing, pls help me :-(. I would really appreciate all who are going respond to this question.


how to calculate units consumption for a 12 hp motor /hr.


Transmission through a short line depends on


Why you are switching off arc protection mcb when you are taking shutdown for lv board.


When can we take Neutral as common neutral link?


induction 3 phase motor terminal connection


How does the slip regulator works as a startor


1- What is the Polarization Index number be good for 15KV 3c#500MCM electrical cable? 2- Can I use the IEEE Std 43-2000 to perfom the PI test? Thanks


Is it true that in the 3 phase transformer, the limbs of the core are at 45 dgrees to each other. if true, why?


how to select the isolation tranformer for siemens 802dsl cnotroller


54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?