5. A propeller solid shaft of a ship with 200 mm diameter transmit a power of 5 MW at 500 r.p.m. It is proposed to alter the power to 7 MW and speed to 400 r.p.m and to replace the shaft by a hollow shaft made of same material but having only 80% of the weight of the solid shaft. The length of both shafts is to remain same and the hallow shaft is to have the same maximum shear stress as the solid shaft. Compute the ratio between the torque per unit angle of twist per meter for the two shafts and the external and internal diameter of the hallow shaft.

5. A propeller solid shaft of a ship with 200 mm diameter transmit a power of 5 MW at 500 r.p.m. It is proposed to alter the power to 7 MW and speed to 400 r.p.m and to replace the shaft by a hollow shaft made of same material but having only 80% of the weight of the solid shaft. The length of both shafts is to remain same and the hallow shaft is to have the same maximum shear stress as the solid shaft. Compute the ratio between the torque per unit angle of twist per meter for the two shafts and the external and internal diameter of the hallow shaft.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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