The correct answer is C. 60%.
The efficiency of a riveted joint is defined as the ratio of the load that the joint can carry to the load that the individual members can carry. The minimum pitch of a riveted joint is the distance between the centers of adjacent rivets. The minimum pitch is specified in the Indian Standard IS: 800.
The efficiency of a riveted joint is affected by a number of factors, including the type of rivet, the diameter of the rivet, the thickness of the plates, the pitch of the rivets, and the quality of the workmanship.
The efficiency of a riveted joint is typically in the range of 50% to 70%. The efficiency of a riveted joint is higher for joints with smaller rivets, thicker plates, wider pitches, and better workmanship.
The efficiency of a riveted joint is an important consideration in the design of riveted structures. The efficiency of a riveted joint affects the load-carrying capacity of the structure and the cost of the structure.
The following are the brief explanations of each option:
- Option A: 40%. This is the lowest possible efficiency of a riveted joint. This efficiency is achieved when the rivets are not properly aligned and when the plates are not properly fitted.
- Option B: 50%. This is a typical efficiency of a riveted joint. This efficiency is achieved when the rivets are properly aligned and when the plates are properly fitted.
- Option C: 60%. This is a higher efficiency of a riveted joint. This efficiency is achieved when the rivets are properly aligned, when the plates are properly fitted, and when the workmanship is good.
- Option D: 70%. This is the highest possible efficiency of a riveted joint. This efficiency is achieved when the rivets are perfectly aligned, when the plates are perfectly fitted, and when the workmanship is excellent.