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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what will happen if we pass a dc current through a ac bulb of 60 watt.The dc current is half ac one

4 6393

What are methods to avoid the inrush current at the time of starting of power transformer ?

Wipro,

8 9046

What is the min and max ohmic value for earthing?

NewTek, Wipro,

15 29789

WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??

Reliance,

7 13106

WHY IS RESTRICTED EARTH FUALT PROTECTION NEEDED?? WHY CANT DEIFFERENTIAL PROTECTION SUFFICE???

14 22002

As Electricity Generates in MW I w'd like to know What are the factors we have to consider regarding the transmission of electricity from generation station to Public uses(230 V)

1 2637

In view of Electrical Engg. What is the use of SCR(Silicon control rectifier)

11 11453

if receiving voltage is higher than sending ones what will be the effect of receiver

4 4343

What is the breakdown voltage?

13 10206

What are types of encoders?

ITC Infotech, UFO, Wipro,

19 79323

how water and air molecules are conduct the heat?

1 2335

sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"

980

What is min and max voltage between earth and neutral/phase if it perfect earthing?

Epoch, ISS, ITC Infotech, L&T, Power Works, Statex, Sterlite, Wipro,

37 223470

why designer use kva rating instead of kw in transformer rating???????????????

9 14923

send me any model test paper of clerical post of state bank of india.......

878


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Un-Answered Questions { Electrical Engineering }

Why squirrel cage motor can only use with low starting loads ?

1064


When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

1117


What is the minimum value of hfe for the oscillations in transistorized rc phase shift oscillator?

176


What is difference between Sample test and Routine test in safety standard?

789


tell me about roaster switch .& what is the function in transmission & distribution?

1691






I am going to appear for the RRB Chennai Section Engineer online exam. Please send me the question papers from 2001 to date to my mail id:upendrakrishna20@gmail.com,plz send me ,or send any other rrb papers plzzzzzzzzzzzzzzzzzz

1169


why Induction Generators are not "Black start" ? and apart from WTGs where this types of generator are generally used?

1745


A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

813


to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power

1045


Is electro plating what type of load whether resistive, inductive or capacitive loads

2410


What is voltage ratio of a transformer?

154


What is the different between conventional MCC and intelligent MCC? Common controller or controller for each bucket

84


how to determine the inrush current of a transformer

1627


what is servo motor and how it works?

1301


th how could we differentiate between armoured copper and armoured aluminium cable what is the basic application? why we prefer the armoured copper as compared to armoured aluminium.

991