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QUESTION: 1

A solid shaft of circular cross-section is subjected to a torque T which produces a maximum shear stress f_{s} in the shaft. The diameter of the shaft should be

Solution:

∴

QUESTION: 2

A hollow shaft of inner radius 30 mm and outer radius 50 mm is subjected to a twisting moment. If the shear stress developed at inner radius of shaft is 60 N/mm^{2}. What is the maximum shear stress in shaft?

Solution:

As we know, torsional shear stress varies linearly

∴

= 100N/mm^{2}

QUESTION: 3

A solid steel shaft is surrounded by a copper shaft, such that, what is the ratio of if composite shaft is subjected to a twisting moment?

Solution:

QUESTION: 4

A shaft is subjected to a bending moment M and a torque T. The equivalent bending moment. M_{eq} on the shaft is given by

Solution:

QUESTION: 5

A shaft of diameter ‘d’ is subjected to bending moment M and twisting moment T. The developed principal stress will be

Solution:

QUESTION: 6

If n is the ratio of internal and external diameters of a hollow shaft, ratio of weights of hollow shaft and solid shaft in order to have same strength will be

Solution:

In order to have same strength,

QUESTION: 7

If a shaft is simultaneously subjected to a torque T and a bending moment M, the ratio of maximum bending stress and maximum shearing stress is given by

Solution:

QUESTION: 8

If two shafts of the same length, one of which is hollow, transmit equal torque and have equal maximum stress, then they should have equal

Solution:

As T_{s} = T_{h},

∴ Z_{s} = Z_{h}

QUESTION: 9

A circular shaft fixed at A has diameter D for half of its length and diameter D/2 over the other half as shown in the figure. What is the rotation of C relative to B if the rotation of B relative to A is 0.1 radian?

Solution:

QUESTION: 10

A shaft AS of'length l, diameter d is subjected to torque Tat section Csuch that AC = l/3, ends of the shaft are fixed, What is the resisting torque at A?

Solution:

Resisting torque at A, T_{A} is given by,

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