Machine Design
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is

None of these
Greater than 1/10
Less than 1/10
Equal to 1/10

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Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Inversely proportional to the applied torque and the polar moment of inertia

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