Unit I

Asynchronous machines : Three phase induction motors. Principle of operation. Cage and slip ring rotors.

Unit II

Torque-slip characteristics. Equivalent circuit. Starting and speed control.

Unit III

Single phase induction motors : Types. Applications. Universal Motor.

Unit IV

Selection of Drives : Electric drives. Individual and group drives. Factors governing selection of drives. Motors for domestic uses.

Unit V

Applications : Cranes, Lifts, General factory, Textile mills, Paper mills, Mining works, cement Mills, machine tools, Belt conveyors, Ships, Refrigeration and Air conditioning.


1. Theraja, B.L., Electrical Technology, Vol 2, S. Chand & Company, 1997.
2. Gupta, J.B., A Course in Electrical Power, S.K. Kataria & Sons, 1997.
3. Hughes, E., Electrical Technology, E.L.B.S. 1996.
4. Partab, H., Art & Science of utilization of Electrical Energy, Dhanpat Rai & Sons, 1997.