Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is the function of buchhos rely in transformer

5 4805

what is the function of conservater in transformer

3 9169

what is the function of cooling tubes in transformer

4 16056




kindly tell me how the load on generator increase by just increasing the fuel of prime mover, as if for exampple 20 MW gen set is synchronized the load ramps from zero to 20 MW gradully and during this procress only fuel of prime mover increases. Which thing determines the load on generator with respect to fuel

Birla,

4 11884

Hi, Next week Iam appearing RRB exam for section engineer. So help me to get modal question papers for this position. Iam very thankful to you. Whether question will be fully techanical format or general form. Please give me a details regarding this exam.

716

Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?

978

Differenciate between circuit wiring and sub main wiring with illustrations

MU,

976

3. What is Impedance Voltage in Transformer?

L&T, Torrent Power, KESC,

16 92588




5. What is PMG in Alternators?

L&T,

11 35127

Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

973

why are you interested in joining in core company instead of joing in software company

11 18104

how to test vector groups in transformer differential relay.

1 1957

Is it true that IPT are more accurate than CVT for Measuring purpose?

2 2414

is emf is indued if dc is passed through coil

5 3919

why transformer not work in dc

16 20385


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Un-Answered Questions { Electrical Engineering }

Under wat condition statcom operates as an inductor for the transmission line?

619


WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?

3334


what are the stresses in circuit breakers ?

653


What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?

790


1.What is the range of stator resistance of 3-phase induction motor? 2.Two electrically operated vibro motors are foxed in parallel direction in vibrating feeders. what is the direction of both vibro motors?

697






1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

933


what is v/f control in VFD?

239


In Power Line Communication (PLC) the wave trap is used to block communication signals from entering neighboring lines. My question is this: Why do they allow for different filtering arrangements on these wave traps? Isn't it always going to be a low pass filter since we want the power frequency to go through, and the comm signal blocked?

680


Why is tan-delta test and capacitor measurement done on alternator?

733


A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

1172


If the earth is a good conductor of electricity, why don't people get shocked every time they walking on earth?

518


1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

761


please send me privious exam's queation papers of section engineer(electrical).

841


sir plz send some previous year questions of jspl.

670


why impedance relay is used for medium transmission line protection

785