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
Pitch point of a cam is

A point on the pitch curve having minimum pressure angle
Any point on the pitch curve
Any point on the pitch circle
A point on the pitch curve having maximum pressure angle

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of bending stress and curvature of the wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of transverse shear stress and curvature of wire

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