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 Categories >> Engineering >> Electrical Engineering
 
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Question Asked @ Answers Views     Select
Do we really need wheels for the transformer    1  707
What is the difference between Off line UPS and Line interruptible UPS?    1  1616
avr is an automayic voltage regulator ... it regulates voltage before it synchronise with grid after synchronisation it regulates power factor why....    7  2367
Why we transmit the power at the voltage in the multiple of 11 or 1.1 like 11kv, 22kv, 66kv, 132kv...... some one told me that it is due to fomr factor 1.1 of sine wave. its fine but while transforming we can choose any voltage, so why only multiple of 1.1 there also.......? plz tell me.    5  1606
Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation? jindal   0  377
On the secondary side of a distribution transformer, we use 1c x 630 sq mm cable. Why dont we use 4 core cables instead of 1 core cables on the secondary. Why we use aluminium cable glands on the outgoing instead of brass cable glands? siemens   2  4257
I have a table fan of Rallifan Make. When I overhauled it I found a stator winding and an aluminum die cast rotor. So it is supposed that it is a 1 phase induction motor. But there are only two terminals coming out and there is no capacitor. Can any one tell how this motor works? or which type of this motor is?    1  1459
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............    0  251
what is differance between PT-100 and thermocouple?    1  3295
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply.............. ntpc   8  6867
why we use CVT (capacitive voltage transformer)in switch yard?    4  5691
what must be the mf for a meter with the following conditions. line ct ratio-100/1 line pt ratio- 220kv/110v meter pt ratio- 3X63.5V meter CT ratio- -/1 A    1  789
A well system is when , no. of bus bar is less or more. Tell me the concept of it.    0  239
A long transmission line is limited by - a)thermal limited b)voltage limited c)stability limited d) L,C limited please explain with proper reason.    1  710
Can a dc motor works as a dc generator. If yes , then how?    2  1990
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Un-Answered Questions
 
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how we can produce negative DC voltage ? please explain it .,thank u 369
Sir,In our company there are 3 caterpillar make(capacity:(1) 3.3KV,2.5MW(2)3.3KV,2.5MW & (3)3.3KV,1.9MW) & 1 deutz make (capacity:11KV,3.8MW)gas engines utilised,all are running in paralell. There are three transformer utilised,(1) 6.25MVA,3.3KV/22KV,Impedence voltage:6.7% used for two generator,both are 2.5MW(2)5.5MVA,3.3KV/22KV,Impedence voltage:7.2% used for one generator of 2.5MW & (3) 5.5MVA,11KV/22KV,Impedence voltage:7.8% used for one generator of 2.5MW.all generator breakers capacity of 1250Amps. Sir,I want the details of fault level calculation of generator,transformer individually & for whole system. If you require any information from me.feel free for contact me sir.pl.send the answer of my question as the earliest as possible. 402
Why the power generated in dams is complex power? Why the generators in dams cannot produce Real power directly (i.e power which has zero reactive part)? 183
how pt is using 269
What is x/r ratio? 696
how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization) 521
how to calculate the step resistance for slipring induction motor,how you deside the no of step for that? 370
what type of earthing do for dry fissure rock? 767
The Q-facr o of a coil given as wL/R. what will be shape of Q versus frequency graph. 307
What is the meaning of utility ground and clean ground? How the distribution panel is grounded? 572
what is The difference between national electrical code and I.S.Code (electrical) and what is the value of NEC in electrical engineering field 273
How to design the NGR Resistance 393
what is the safety points of vaccum circuit breaker. 335
Please give me a solid reason there are 2 ELCB's If we take Phase from ELCB NO:1 an Netural from ELCB N:2 why ELCB is tripping when we connect the Load?please brief me with detail 836
What is the difference between in Fourier series and Fourier Transform. and please tell me the difference between both of them and the why we use them in communication system? 326
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