Machine Design
Stress concentration is caused due to

All of these
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
Variation in properties of material from point to point in a member

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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Set screws are

Used to prevent relative motion between parts
Slotted for a screw driver and generally used with a nut
Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available

ANSWER DOWNLOAD EXAMIANS APP