Electrical Engineering Interview Questions
Questions Answers Views Company eMail

when a cunductor is being disconnected from live cct, still it showing charged, if its checked by line tester?

GEB,

8 4497

WHY CFL can't made in shape of bulb.

5 5589

why three phase system is not preferred in aircrafts power cckts if yes than explain reasons?

3 3208




wat is the role of reactive power in power generation?why we have maintain it.

3 7290

wat is the importance of reactive power in power generation.....if it is zero means wat will happen to system........

Bhel, Jindal,

22 28314

what is difference between differential protection and distance protection and how we calculate the sloop?

OPS, Power Grid,

5 33558

what is slip resistance? how much its value in 110 kw motor? why voltage is varied in vvvf drive ?

Reliance,

1 2711

What type of protective system we uses in L.V. distribution panels?

6 4995




Why P.f. of the system decreases when it is connectect across induction motor? & how to maintain the p.f. of system to unity.?

Reliance,

6 5765

What do you mean by S.F.U. unit? application of it.

Indo Asian,

16 82718

what is green house effect?

4 3234

what do u mean by knee point voltage?

TATA,

7 10822

what is negative,positive abd zero sequence current explain clearly

Jindal,

1 6594

what happens when ac supply is given to D.C motor.

17 21366

what is purpose of using reactor in substations.

Heavy Engineering Corporation Ltd HECL,

20 90641


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Un-Answered Questions { Electrical Engineering }

Differenciate between circuit wiring and sub main wiring with illustrations

1000


in conventional fan regulators how the current varies with speed?

678


Is there any problem about which the drive (inverter) doesn't show/display the alarm and/or fault but instead of this , it doesn't work ? I want to know that could there be any kind of problem in the drive when the drive doesn't display the alarm and/or fault ?

739


please give me all the Alarm .Trip ,Safety Relays & Conditions of Chiller mail me on ashokbabunhce@gmail.com

598


How to test Alternator stability test for REF relay

187






in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

886


Atwhat condition reverse power relay will act?

834


what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?

1037


What type of surgery impedence with 200ohs 

534


What is the maximum and minimum rating of UPS?

182


what is the preventive maintence for ht panels and busbars and vcb abd acb's.

1105


What is the difference in calculating size of AC cables compared to calculating size of DC Cables? Usually DC Cables are larger than AC Cables although they have the same ampacity. Why is it?

772


Briefly describe means used by electricity suppliers to influence the flow of active and reactive power in power networks (one for each type)?

782


draw the full wave and half wave circuit of 3 phase system and inverter circuit used in ups 

1102


How to calculate main incomer rating of APFC Panel ? Let's say i want to find main incomer for 11kV, 1000kVAR Panel.

149