Electrical Engineering Interview Questions

how much cable size required for 70 kilowatt load.

205

how to find out cable size if load is 2800 watts, 230 volts AC supply and load distance is 1800 meters

214

How to find out damper winding failure for synchronous machine?

151

How to calculate MCB Breaking capacity.

76

What is making & breaking current ???

JLL,

198

Where can i get practical knowledge of solar system?

197

What is contract demand in solar system?

247

Explain the operation of grid connected central solar inverter ?

281

My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?

204

how to select correct size of power cable for inverter duty motor

69

What's voltage?

156

What value of resistance required between Saftey earth and instrunment earth , maximum and minimum values required

193

What is the safety of UPS?

90

What does the letter CTNM in negative phase sequence relay means?

25

Un-Answered Questions { Electrical Engineering }

WHY EARTHING NOT NEEDED IN BATTERY IN SUBSTATION

751

Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studies in Not Possile ? Q2)Why majority of Buses in power system are load buses Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ? Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason

456

What type of surgery impedence with 200ohs

579

how to calculate compresor capacity?

909

What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection

1683

how to select the double earth conductor if 21A full load?

771

A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

499

what is gridrotor resistance starter

709

I have a reading off 1.5ohms at my mem my main c/b is rated at 40/6 amps in a domestic house and i was told to change it to a b curve c/b is this ok

479

7886

there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit

724

why a tester wont shock while testing the power in house

560

percetans

1002

How many lightning arrestors to be installed on 50MX60MX10M building and is there any formular for that?

734

what type questions asked in hp cl

753