The correct answer is: C. Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings.
A rivet is a permanent fastener that is used to join two or more pieces of metal together. It consists of a head, a shank, and a tail. The head is the part of the rivet that is visible after it has been installed. The shank is the cylindrical part of the rivet that passes through the two pieces of metal being joined. The tail is the part of the rivet that is left after the rivet has been installed.
A bolt is a temporary fastener that is used to join two or more pieces of metal together. It consists of a head, a shank, and a nut. The head is the part of the bolt that is visible after it has been installed. The shank is the cylindrical part of the bolt that passes through the two pieces of metal being joined. The nut is the part of the bolt that is used to tighten the bolt.
The main difference between a rivet and a bolt is that a rivet is a permanent fastener, while a bolt is a temporary fastener. Rivets are typically used in applications where the joint needs to be strong and durable. Bolts are typically used in applications where the joint needs to be easily disassembled.
Here is a brief explanation of each option:
- Option A: Material cost of a rivet is higher than that of a bolt. This is not always the case. The cost of a rivet or a bolt will depend on the type of material used, the size of the fastener, and the quantity being purchased.
- Option B: Tensile strength of a bolt is lesser than that of a rivet. This is not always the case. The tensile strength of a rivet or a bolt will depend on the type of material used, the size of the fastener, and the manufacturing process.
- Option C: Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings. This is the correct statement. Rivets are typically used in applications where the joint needs to be strong and durable. Bolts are typically used in applications where the joint needs to be easily disassembled.
- Option D: Riveting is less noisy than bolting. This is not always the case. The noise level associated with riveting or bolting will depend on the type of tools being used, the skill of the operator, and the material being joined.