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Solution


Q.

In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument, thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51, then the correct thickness of the sheet is ______ mm.

[Assume least count is 0.01 mm]                      [2026]
1 1.54  
2 1.48  
3 1.50  
4 1.51  

Ans.

(1)

Zero error e=-3×LC=-0.03 mm

Reading taken =1 mm+51(0.01 mm)

=1.51 mm

So, correct reading =1.51-(-0.03)

=1.54 mm