Minimum pitch provided in riveted steel tanks is (where d is diameter of rivets) A. 1.5 d B. 2.0 d C. 2.5 d D. 3.0 d

The correct answer is B. 2.0 d.

The minimum pitch provided in riveted steel tanks is 2.0 d, where d is the diameter of the rivets. This is to ensure that the rivets are able to withstand the loads placed on them and that the tank is structurally sound.

Option A, 1.5 d, is not a safe pitch as it would not provide enough support for the rivets. Option C, 2.5 d, is a safe pitch but it is not the minimum required pitch. Option D, 3.0 d, is a safe pitch and it is the minimum required pitch.