Q3.An electric motor is connected to a turbine with the help of a hollow shaft. The hollow shaft has an internal diameter that is 23% of its external diameter and transmits 550 kW power at 130 r.p.m. Determine the minimum external diameter of the shaft if the shear stress is not to exceed 5700 and the twist in a length of 1.6 m should not exceed 1.5 degrees. N Cm² Assume maximum torque = 1.2 mean torque and modulus of rigidity 7.5 x 106 N cm2* (4.0 Marks) Generator Rotation Turbine (a) B

Q3.An electric motor is connected to a turbine with the help of a hollow shaft. The hollow shaft has an internal diameter that is 23% of its external diameter and transmits 550 kW power at 130 r.p.m. Determine the minimum external diameter of the shaft if the shear stress is not to exceed 5700 and the twist in a length of 1.6 m should not exceed 1.5 degrees. N Cm² Assume maximum torque = 1.2 mean torque and modulus of rigidity 7.5 x 106 N cm2* (4.0 Marks) Generator Rotation Turbine (a) B

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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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

Q3.An electric motor is connected to a turbine with the help of a hollow shaft. The hollow
shaft has an internal diameter that is 23% of its external diameter and transmits 550 kW
power at 130 r.p.m. Determine the minimum external diameter of the shaft if the shear stress
is not to exceed 5700 and the twist in a length of 1.6 m should not exceed 1.5 degrees.
N
Cm²
Assume maximum torque = 1.2 mean torque and modulus of rigidity
N
7.5 × 106 ².
(4.0 Marks)
cm²
Rotation
Turbine

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