Correct option is D
A
feeler gauge is used to measure
small gaps or clearances between two matching parts. It consists of a set of thin metal blades of various thicknesses, marked with their precise thickness values. By inserting different blades or combinations of blades into the gap, the clearance can be accurately determined. Feeler gauges are commonly used for checking valve clearances, spark plug gaps, and alignment in machinery.
Construction of Feeler Gauge:
Typically consists of 10–30 thin metal blades of standard thickness, ranging from
0.01 mm to 1.00 mm.
Common Uses:
· Setting valve clearances in engines.
· Measuring gaps between precision machine components.
· Adjusting spark plug gaps in automobiles.
Working Principle:
· A blade that fits snugly in the gap represents the size of the clearance.
· Multiple blades can be stacked together to measure larger gaps.
