Electrical Engineering Interview Questions
Questions Answers Views Company eMail

whats the formula for convert KVAR to FARADS

2 7916

We have three 33kv substations. All of them energised by same source.When i am checking the phase sequence between one substation to other substation (like R Phase to R Phase) by multimeter i am getting some voltage.Near to LT panels UPS panels are there. Can u explain whether any possible to happen like that. In Phase SEquencemeter is showing correctly in both substations. How is it happen. Explain me.Explain me communication signal will produce Phase difference on this case.

3 2701

What is AVR in Generators and How is it working.

4 5490




is starting current of induction is high or stating current of ransformor is hign ,for the same rating

BARC,

12 6342

Why is our voltage always seems to be 3.3Kv,11Kv,66Kvetc.. why not 40Kv,39Kv,65Kv???

3 3513

could i arrange a faulty and healthey battery bank togather in parallel , if your ans is not then why?

3 2041

could i arrange a faulty and healthey battery bank togather in parallel , if your ans is not then why?

3 1984

what is phase angle ? and also tells me why my phase-phase voltages are 390 rather then my single phase voltages are 221 and 223 respectivly?

2 1873




why we +ve load distribution in 24v and -ve load distribution in 48volt in the telecom sector.?

2 1966

what happen if we supply ac to the field of a alternator?

5 3030

how to calculate power consumption in slip ring motor at different step

ABB,

632

in ONAN type transformer winding temperature is lower than oil temperature at evening time but morning winding temp is higher than oil temp what is the reason?

Areva,

2 3386

how the grounding[earting] is achieved on ships.

1 2348

1]how the voltages and frequency are achieved on ships. 2]how does the line and phase voltages are related on ships.

3 1557

how many units will 100 kvar capacitor consume for one day?

Philips,

2 4481


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Un-Answered Questions { Electrical Engineering }

nwhat are the main Components of servo motor?

589


how to discharge 3 phase power factor correction capacitors

976


The capacity of the transformer is 20/25 MVA, Ratio is 132/11 KV, Vactor group YNyno. and impedance is 10.07%. As per the calculation the secondary current is 1312.2Amps. The maximum fault current the transformer should sustain is 13.030KA. How many times the transformer should sustain the maximum short circuit current of 13.030KA over a period up 1 Year. The transformer is repaired one & 10 Years old.

2631


Please brief what is sinewave

523


how to determine motor size for a fan application?

669


(1)Can earth and be conected together (2) what is the diferent between earth & neutral

171


hi if anybody got model questions for cpcl Grade'A' electrical engineer position.send it to my mail please krishkumar22@gmail.com

382


What is meant by RVT and NDR ? expansion and details of it

804


what kind of technical test that i need to learn because i have an interview tomorrow.. please someone help me..

457


Benifits of 3ph 4 wire metering over 3ph 3 wire

978


High speed earth switch operation with diagram

564


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

335


Stator of 3-phase IM has 3 slots per pole per phase. If supply frequency is 50 Hz, calculate the speed of rotating stator flux A 1000 rpm B 500 rpm C 1500 rpm D 1440 rpm

448


Power factor =1.000 at factory in supply. However, PF = 0.8 at motor end. Current = 100 Amp, Voltage = 400 V. What is the power distribution loss? Can I reduce it by adding capacitor at the load feeder?

604


HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

458