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Electrical Engineering Interview Questions

I need to calculate the Battery bank back up for below configuration:- UPS - 120 KVA Battery Bank - 200Ah Volt of each cell - 12 V Total No of cell - 34 No's Can you please help me to get the battery back up time for above configuration...? along with formula

1423

how can i design a APFCR panel? please explain with example..

1561

why don't we use the generator as a motor? and what will happen?

987

1217

Dg pf .71 i am improve pf 0.80 what capacitor connected in dg how?

823

1.Can we use 6.6/11KV 300sq mm xlpe 3core cable for LT use (415 Volt). 2. If we use it for LT then what is the current rating

833

How to calculate wire length,size & current? ( related to control panel)

1201

what is the function of a circuit breaker ?how does the circuit breaker function during normal operation of an electrical system

1934

Difference of induction motor & servo motor ??

871

What is the minimum permissive IR value for LT & HT motor for safe starting?

1963

what is the CT & PT. where is it uses.what is the using that plese kindly answer me...?

3128

What is the function of isolater

3273

How convergengr of nr method is not dependent on selection of slack bus and how gauss siedel method depends?

857

why the field winding in dc motor is not short circuited eventhough dc supply is applied across the winding

976

How the annunciator works ? How to do its wiring

Ford, MSEB,

1204

Un-Answered Questions { Electrical Engineering }

how to test and calculat the head and discharge in borewell compressor

1325

Define reserve-generating capacity?

230

What is meaning of out of phase (making & breaking) capacity And how to calculate

1220

How capacitor improves pf

765

how can we make cable shedule for controll wiring ? which details must be required for it.?

1189

How can we increase fuel-power ratio of any DG set?

941

is all the servo motors having brake?please specify which servo motors having brake for stop on position and which are not.

891

how to calculate differential current when we testing differential relay..suppose we have 1000kw generator,630amp VCB,what value we should put /inject so that relay trip the VCB? PLLZ justify ur comment

796

which VFD is better ( LT or HT)

1186

I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

1015

Which motor connection is preferable star-delta or delta-star?

228

Define characteristics impedance?

266

how can check the resistance of battery contact?

1330

what is R Core Transformer. how it differs from normal transformers. dont search in net and post the answer.

1195

how external lighting design? please give examples?

1031