Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life
Belts are available in sets

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A tap bolt

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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface
Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and zero at the outer surface

ANSWER DOWNLOAD EXAMIANS APP