Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
In increasing the slip of the belt
To increase pulley life
To keep the belt in centre on a pulley while it is in motion

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Set screws are

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

ANSWER DOWNLOAD EXAMIANS APP