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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..............
1822I 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 4277On 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?
2 11044Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?
2257Why 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.
7 7789avr is an automayic voltage regulator ... it regulates voltage before it synchronise with grid after synchronisation it regulates power factor why....
7 9071how to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor
3 14482How o select the electrical fuse?.What are its characteristics.How to select the material od fuse?
BARC,
1986where is the need for short circuit test for 3 see is required and why? can you explain in brief with application
1960I want to know in body earthing which material can be use either copper plate or GI plate please guide us which is best option.
3 5166Post New Electrical Engineering Questions
What is the difference between rated and per unit in transformer?
why sometime we get electrical shock while touching the ballon of dish tv connection ? which we should not get.
What is primary and backup protection?
Why power genaration in India is at 50HZ while America its 60HZ
what is the operating time for LBB and how does the LBB relay realise whether cb is opened or not?
please send me latest & previous years question papers for IOCL Technical level questions
Define active filter?
How to select HT/MV cable size ?
What is the meaning of Insulation H for transformers????
What is the application of Dyn1 and Dyn11 vector group of transformer?
State kirchoff voltage law?
1) What are your personal strength? 2) What are your personal areas of improvement? 3) What are your expectations from from a particular job? 4) what are your carrier objectives?
what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor
I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?
sir i am apearing for nic exam.i dont know exam pattern.can you please send me some model papers
