Chapter 19.1, Problem 2RQ

For a four pole, 16 slot armature with two coil-side/slot having wave connected progressive winding has single turn coils has simplex winding. The number of current paths is?

The shunt field winding of a shunt generator has a resistance of 80 ohms at 20⁰C. After several hours of continuous operation, the winding temperature rises to 50⁰C. How much is the winding resistance under this condition, Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0⁰C.

Figure Ql shows a two-legged iron core with air gap on the middle leg. Primary winding and secondary winding are placed around the left and right legs respectively. Nı and N2 are the number of turns of the primary and secondary windings, respectively. The primary current (In) is supplied to the primary winding with the direction indicated in the diagram. Primary Winding Secondary Winding Figure Ql: Two-legged iron core The fringing effect of the air gap plays a role in the flow of the magnetic flux through the secondary winding. Explain how the fringing effect of the air gap can affect the voltage induced across the secondary winding. The explanation should be supported with a relevant equation. |