While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm and i

Question

While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm and it has 100 divisions on circular scale. The diameter of the wire is 50 x ​ mm . The value of x is :

TestHub · Accepted Answer

​ MSR = 1 mm , CSR = 42 , pitch = 1 mm LC = No. of CSD pitch ​ = ( 100 1 ​ ) = 0.01 mm Diameter = MSR + LC × CSD Diameter = 1 + ( 0.01 ) × 42 mm Diameter = 1.42 mm = 50 x ​ ∴ x = 71 ​

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