Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with single cover plate
Lap joint with one ring overlapping the other
Any one of the above
Butt joint with double cover plate

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Have variable bending moment (M) in each leaf
Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf
Make M/I constant throughout the length of the leaf

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Machine Design
A bolt of uniform strength can be developed by

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

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