## Machine Design A stud

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other

## Machine Design The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch

## Machine Design Maximum principal stress theory is applicable for

All of these
Elastic materials
Brittle materials
Ductile materials

Brazing
Flaring
Fusion welding
Soft soldering

## Machine Design If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum distortion energy theory
Maximum shear stress theory
Maximum strain energy theory
Maximum principal stress theory

## Machine Design The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

P1 / P2 = e–ᶠα
P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα