College

Which of the following cannot be directly used for angle measurement?

A) Bevel protractor
B) Sine bar
C) Dial indicator
D) Interferometer

Answer :

Final answer:

Among options A, B, C and D, the dial indicator (C) cannot be directly used for angle measurement. Whereas devices like a bevel protractor, sine bar, and interferometer are designed to measure angles.

Explanation:

The option C, the dial indicator, cannot be directly used for angle measurement. The dial indicator is primarily used to measure straight-line distances, such as the deviation in an object's flatness or alignment, rather than angles. Devices such as a bevel protractor, sine bar, and interferometer are more appropriate for angle measurement. Just as an example, a bevel protractor can be used to measure an angle by aligning its edge with the angle in question and reading the result on the graduated dial. A sine bar utilizes trigonometric functions to accurately gauge an angle, while an interferometer employs principles of wave interference to measure small angles to very high precision.

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