Machine Design
Cap screws are

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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and bending stress in the wire

ANSWER DOWNLOAD EXAMIANS APP