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

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

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these

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Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
All of these
Abrupt change of section

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