GATE PI · 2026 · PI
Question 54: Metrology and Inspection
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Question 54
PINAT2 marksNeeds review
In the measurement of surface roughness using a 2D stylus profilometer, a surface profile measured over a length of 0.8 mm was recorded on a graph paper. During recording, vertical magnification of 10,000 and horizontal magnification of 100 were used. The areas in the as-recorded graph above and below the datum line are as follows:
Above (mm²): 140, 60, 150, 50
Below (mm²): 70, 50, 120, 160
The average surface roughness (
) of the surface is _____ μm (rounded off to two decimal places).Log in to check the answer
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2026PI
GATE PI 2026 · Paper 1
Production and Industrial Engineering · Original paper archive
- Section
- Production and Industrial Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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