Numerical - Shaft diameter, given tensile stress & power

Q.  A shaft transmits power of 30 kW. According to maximum principle stress theory and shear theory diameter of shaft is 70 mm and 73 mm respectively. Tensile stress acting on the shaft is 50 Mpa. What will be the shaft diameter to transmit power?
- Published on 14 Sep 15

a. 65 mm
b. 70 mm
c. 73 mm
d. Insufficient data

ANSWER: 73 mm

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    Discussion

  • Sravanthi   -Posted on 03 Nov 15
    Given: Diameter (Maximum principle stress theory) = 70 mm, diameter (Maximum shear stress theory) = 73 mm

    Maximum diameter is considered while designing a shaft. Diameter obtained according maximum principle stress theory is 70 mm and diameter obtained by maximum shear stress theory is 73 mm.

    - Hence, diameter obtained by maximum shear stress theory is considered.

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