IMPORTANT TOPIC FOR COMPETITIVE
EXAMINATION (MPEB,SSC JE)
UTILISATION OF ELECTRICAL ENERGY
-----MOTOR FOR PARTICULAR SERVICES
Dc motors
· Series wound --- characteristics and cost
1.
Very high starting torque.
2.
Torque varies linearly as the square of the current.
3.
Varying speed; dangerously high at no load.
4.
Self-adjustable speed –decrease in speed with increase in load.
5.
Speed control possible.
· Application
1.
electric traction (electric railways)
2.
Rolling mills –Rolling of steel, the process during which the cross
section of the metal gets reduced, while increasing its length proportionately,
is the major function of steel mills.
3.
Metallurgical works
4.
Mine hoists
5.
Continuous conveyors
6.
Cranes
7.
Valve operation
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