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for 5KW resistive load can anyone please suggest me whether to go for UPS/Inverter or Generator depending upon cost calulations
what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
what are safety measures in /control in diesal engine/ explain them?
how does grading rings & spacers in transmission line works? Working Principle?
why are the maintaine power factor and how can this control and this is how work.
what is v/f control in VFD?
Is the installation of the filter cloths necessary before spreading the gravels at the transformer yards?
mostly the questions were from machines... d.c. machines, transformer, synchronous and induction all theory paper........ few from power system... but the level of paper was easy.....
what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors
differnce between single acting and double acting solenoid valves
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..............
difference between semiconductor & conductor & insulator?
What happens to voltage when current is zero?
how to remover corona effect and hysteresis losses from contactor
Why efficiency in thermal power plant is low?