What are the dimensions of a properly formed rivet head?

The dimensions of a properly formed rivet head are essential for ensuring the structural integrity and load distribution when the rivet is installed. The correct answer states that the head should be 1-1/2 times the shank diameter in width and 1/2 the shank diameter in height.

The width of the rivet head being 1-1/2 times the shank diameter provides adequate surface area for load transfer, which is necessary for strength and connection integrity. If the head were smaller, it might not adequately support the structure, leading to increased stress concentrations in the surrounding material. The height being set at 1/2 the shank diameter is also important—it allows for sufficient deformation during the riveting process without compromising the rivet's strength or causing it to protrude excessively.

The other choices either provide dimensions that would not yield a solid rivet connection or are not standard practices in the aircraft industry, making option B the preferred standard for rivet head formation.