Specifications

193
Part – IV
Answer Any Four Questions Elaborately 4x20=80Marks
50. Derive expressions for electrical and mechanical degrees in terms of poles and slots.
51. Develop a 3 phase, single layer concentric type of winding for a 4 pole ac machine having
24 slots using a) Half coil winding OR b) whole coil winding OR c) mush winding
52. Develop a winding diagram for a 4 pole, 13 slot double layer simplex wave connected dc
machine with 1 commutator segments. Indicate the position of brushes.
53. With suitable circuits, explain briefly the method of 3 – phase power measurement using i)
single wattmeter ii) two wattmeters and iii) three wattmeters.
54. Explain with neat sketches, the construction and working of an electric toaster
55. Stating the function of bimetallic thermostat, explain briefly the construction and working of
Automatic Iron box.