Metrology And Inspection

- The Rockwell hardness test uses a diamond cone indenter (Option IV).
- The Vickers hardness test uses a square-based diamond-pyramid indenter (Option I).
- The Brinell hardness test uses a hard steel ball indenter (Option II).
- The Knoop hardness test uses a rhombic-based diamond-pyramid indenter (Option III).

A ratchet screw in a micrometer is used to apply a constant pressure on the job specimen ensuring that the measurement is consistent and accurate regardless of the user’s hand pressure

In clearance fit the shaft is always smaller than the hole Therefore the upper limit of the shaft must be greater than the lower limit of the hole to ensure a clearance gap between the parts

Step 1: Understand sine bar specifications. A sine bar is a precision instrument used to measure angles in machining. It consists of a bar with two rollers at each end. The key specification of a sine bar is the center distance between the two rollers. Step 2: Conclusion The sine bar is specified by the center distance between the two rollers (option 4). Final Answer:

Step 1: Understand the function of a V-block.
A V-block is a precision tool used in workshops for holding cylindrical workpieces for measurement and inspection. It is designed with a "V" shaped groove that ensures the workpiece is held securely, and it is commonly used for checking the roundness and straightness of cylindrical jobs. Step 2: Conclusion Thus, the V-block is primarily used to check the roundness of cylindrical jobs. Final Answer:

Step 1: Understand measuring tools for diameter.
- Vernier calipers and digital calipers are suitable for measuring dimensions with less precision and are generally used for more general measurements.
- Micrometers are highly accurate instruments specifically designed for measuring small dimensions, including the diameter of cylindrical objects with high precision.
- Gauge blocks are used for setting reference standards and are not typically used to measure the diameter directly.
Step 2: Conclusion The most accurate method to measure the diameter of a cylindrical object is with a micrometer.
Final Answer: