Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

70 to 83%
80 to 90%
45 to 60%
63 to 70%

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Set screws are

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

ANSWER DOWNLOAD EXAMIANS APP