Electrical Engineering Interview Questions
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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 1860

What should be the minimum depth of ground laid 66 kv ht cable?

L&T,

3 4601

IS THE ANY DIFFERENCE B/W GENERATORS & ALTERNATORS

6 4129




what should be the value of proper neutral earthing resistance?

ABC,

3 4529

what is the minimum distance between substation wall and LT panel outer surface?

L&T,

3 8806

what is the IS foe lightning arrester?

858

How to calculate the Meter constant for the given Meter (by using any formula)

Viva, HCL,

4 58052

What is the difference between a Vacuum Circuit Breaker and a Load Break Switch?

7 17394




Which motor is suitable for mixer grinders.

12 14816

what is earthing/

CPCL, B.Tech, Mobiserv,

3 3049

what is the use of earthing?

CPCL,

1 3455

why we provided electrical earthing?

CPCL,

5 5387

explain the details about vaccum circut breaker and advantages?

CPCL, Unisol,

4 3763

Car battery + terminal allways biger than - terminal! Why?

2 2746

why commutator is attached with only dc macine

ONGC,

8 7170


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Un-Answered Questions { Electrical Engineering }

What are the roles and responsibilities of electrical engineer in cement plant

578


How to calculate the current of Highpressure Mercury Vapour Lamp?what is the basis?whether we have to consider power factor or not?

771


what is meant by CT`s saturation ? Can we use Metering CT`s with Protetection CT`s ?

794


why we use Test Terminal Block in 11 KV and 33 KV electrical panels.

195


How are load losses and no-load losses measured at site in a DG set?

581






Why front mounted CT polarities are always towards breaker?

719


Ratings of power transformer,Distribution transformer.

212


HOW TO TEST A LIGHTENING ARREST ER ?

877


What is the Minimum winding resistance of motors ( small & big)? referance range

839


In case of generator when we consume more power produces by it why load on generator increase and starts sound more. and how it is adjusted..

581


How it can worked plc based electrical system And which type of software using.

908


if we install two earth pits with a clear space of 5m without any interconnection,by checking the digital multimeter will it show continuity between earth pits? If so what would be the approx. value

623


what is the isolation transformer. what is the isolator?

807


The power supplied to a 33microF capacitor from a 120V, 60Hz source will be

741


why the frequency and voltage in india is 230v and 50HZ. when compared to USA say 110v and 60 HZ.

222