Final answer:
The correct answer is Bearings. Bearings are removable inserts that fit between the crankshaft main journals and block the main bore. They help reduce friction and support the crankshaft, allowing it to rotate smoothly as they play a crucial role in various machines and mechanisms.
Step-by-step explanation:
The correct answer is A) Bearings. Bearings are removable inserts that fit between the crankshaft main journals and block the main bore. They help reduce friction and support the crankshaft, allowing it to rotate smoothly. For example, in an internal combustion engine, the crankshaft is supported by multiple bearings to ensure smooth rotation and minimize wear and tear between the crankshaft and the engine block.
Bearings are removable inserts that fit between the crankshaft main journals and block the main bore. They help reduce friction and support the crankshaft, allowing it to rotate smoothly as they play a crucial role in various machines and mechanisms. Understanding bearings is important in engineering, specifically in the field of mechanical engineering, as they play a crucial role in various machines and mechanisms.