What is meant by pwm control in dc chopper?

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sir i am completed B.E in 2006 i wrote RRb Section Engineer Exams two times .how to prepare and how is ask previous question paper some previous question paper send through mail id

2 Answers   RRB, Spectrum,

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Why does all cellular networks have same shape of sim? Why is it designed in such a particular shape? Does it have any other shape?

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Draw the circuit diagram of 1φ capacitor commutated current source inverter and explain its operation with equivalent circuits for different modes and necessary wave forms?

0 Answers  

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why rs232 is used in uart when there are many rs devices like rs449 etc . what is the main advantage in using rs232

0 Answers  

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In wave guides tem wave propagation is not exit, give the physical interpretation?

0 Answers  

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why we not connect the 12 V batteries in parallel to get the more backup supply ? how to calculate the input wattage and output wattage of an UPS ?

1 Answers  

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What is meant by commutation?

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difference between cell and battery?

5 Answers   TATA,

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write test cases for cases

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Explain what is the main application of scr in electronic field as well as in software field?

0 Answers  

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I am going to join in RFID technology company in chennai.what about the future for that technology?

1 Answers   ISRO,

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