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 1821

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

L&T,

3 4525

IS THE ANY DIFFERENCE B/W GENERATORS & ALTERNATORS

6 4056




what should be the value of proper neutral earthing resistance?

ABC,

3 4456

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

L&T,

3 8622

what is the IS foe lightning arrester?

795

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

Viva, HCL,

4 56281

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

7 16780




Which motor is suitable for mixer grinders.

12 14633

what is earthing/

CPCL, B.Tech, Mobiserv,

3 2968

what is the use of earthing?

CPCL,

1 3373

why we provided electrical earthing?

CPCL,

5 5317

explain the details about vaccum circut breaker and advantages?

CPCL, Unisol,

4 3681

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

2 2682

why commutator is attached with only dc macine

ONGC,

8 7056


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Un-Answered Questions { Electrical Engineering }

Tell me all plants load factors i.e which plant operating on which load?

727


what is difference between speed mode and torque mode in motor?? explain in simple words please.

303


Zone of protection and tripping scheme of arc protection relay.

591


SIR, GIVE ME OPGW SAG CALCULATION FORMULA I AM DAE ELECTRICAL. THANKS

4243


11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?

324






limitation of conductor height on ground when we consider EMC

608


why booster transformer is used in sumpners test conducted on transformer????

1973


List the power rating of any 5 important electrical appliances used in houses.

697


what is difference between earthingpits,earthing grid & earthing mess?

993


I use 20 nos led tube 4feet, in pathway 100mtr approximate, so what size cable i use for lighting

176


at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

692


armature winding of dc machine produce alternating emf then it convert in to dc by using commutator.But only we consider armature resistance why don't we consider inductive reactane effect?

763


0.5,1,1.5,2.5,4.0.6.0,10,16 square mm electrical wires how much take maximum current in 50htz

880


how to enter inverter parameter? without manaual?

747


What are conduct on the testing in cf in ur site?

397