Machine Design
A V-belt designated as B 4430 LP has

4430 mm as nominal pitch length
4430 mm as diameter of small pulley
4430 mm as centre distance between pulleys
4430 mm as diameter of large pulley

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Jam nut is a locking device in which

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
A slot is cut partly in middle of nut and then slot reduced by tightening a screw
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is more stretched than the outer side during the manufacturing process
It is subjected to a higher cyclic loading than the outer side
It has a lower curvature than the outer side
It is subjected to a higher stress than the outer side

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Machine Design