The correct answer is A. 1.5 d.
The minimum pitch of rivets is the distance between the centers of adjacent rivets in a row. It is important to ensure that the minimum pitch is not less than the required value, as this will ensure that the rivets are properly spaced and that the joint is strong.
The minimum pitch is typically specified in the design of the joint. It is based on the diameter of the rivets and the type of joint being made. For example, the minimum pitch for a lap joint with 1/2″ diameter rivets is 1.5 times the diameter of the rivet, or 3/4″.
If the minimum pitch is not met, the rivets may not be able to carry the load of the joint. This can lead to the joint failing, which can be catastrophic. Therefore, it is important to ensure that the minimum pitch is always met when riveting joints.
Here are some additional details about each option:
- Option A: 1.5 d. This is the correct answer. The minimum pitch of rivets shall not be less than 1.5 times the diameter of the rivet.
- Option B: 2.0 d. This is not the correct answer. The minimum pitch of rivets shall not be less than 1.5 times the diameter of the rivet.
- Option C: 2.5 d. This is not the correct answer. The minimum pitch of rivets shall not be less than 1.5 times the diameter of the rivet.
- Option D: 3.0 d. This is not the correct answer. The minimum pitch of rivets shall not be less than 1.5 times the diameter of the rivet.