Question

The circular scale of a screw gauge has 50 divisions and pitch of 0.5 mm. Find the diameter of sphere. Main scale reading is 2 -

A. `1.2`
B. `1.25`
C. `2.207`
D. `2.25`

Answer 1

Correct Answer - A
Least count `= (0.5)/(50) = 0.01 mm`
Diameter of sphere
`= 2 xx 0.5 + (25 - 5)xx 0.01 = 1.2 mm`