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Question

The screw gauge is provided with a “ratchet” arrangement, in the form of a knob. The screw should be rotated using this only. The purpose of this is to:

A
Reduce backlash error
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B
Reduce zero error
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C
Prevent damage to the pitch of the screw
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D
Control the rate of rotation of the screw
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Solution

The correct option is C Prevent damage to the pitch of the screw
Ratchet is a small device which is used to provide a limited applied force. Installed at the end of screw gauge, ratchet acts as a safety device for instruments.

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