Machine Design
A tube has the following advantage over pipe

Smoother inside walls
All of these
Lighter and easier to handle
Greater shock absorption

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Machine screws are

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

ANSWER DOWNLOAD EXAMIANS APP