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Why back emf used for a dc motor? Highlight its significance.
Explain advantages of storage batteries
what are the different methods for the starting of a synchronous motor.
Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes.
State thevenin’s theorem?
State norton’s theorem?
explain different losses in a transformer.
Explain different types of d.c motors? Give their applications
explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.
Explain the process of commutation in a dc machine.
Explain what are inter-poles and why they are required in a dc machine.
Comment on the working principle of operation of a single-phase transformer.
Mention the disadvantages of low power factor? How can it be improved?
Mention the disadvantages of low power factor?
State the methods of improving power factor?
