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Dial indicators are used to determine:

A. Time and dates
B. Thickness and diameter
C. Smoothness and finish
D. Dimensions, concentricity, and flatness

Answer :

Final answer:

The correct option is b. Thickness and diameter Dial indicators are measurement tools used in engineering to check dimensions, concentricity, and flatness of machined parts and surfaces.

Explanation:

Dial indicators are precision measuring tools used in engineering for measuring dimensions, concentricity, and flatness of objects. They consist of a plunger that moves vertically in response to changes in the surface being measured, usually displaying the measurements via a dial or digital readout. While they can measure thickness and diameter to some extent, their main applications include ensuring that parts are machined accurately, checking the runout of shafts, and verifying the flatness of surfaces.

For example, a machinist might use a dial indicator to verify that a freshly machined part is perfectly flat across its surface. A mechanic could use it to check for shaft misalignment or to confirm that two surfaces are perfectly parallel or concentric.

Dial indicators are used to determine dimensions, concentricity, and flatness of an object. It helps in measuring the accuracy of the shape, size, and alignment of different parts. For example, in manufacturing processes, dial indicators are used to check the flatness of a surface or the concentricity of two interconnected parts.

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