GATE Quality and Reliability: Metrology and Inspection – Previous Year Questions
14 GATE previous year questions on Metrology and Inspection (Quality and Reliability, Production and Industrial Engineering) with answers and explanations, from every paper.
- GATE 2021 PI Q21 – Match features P:surface-plate flatness error; Q:cam profile; R:machine-tool slideway alignment error; S:screw-thread pitch and angle errors, with…
- GATE 2021 PI Q44 – A hole is 30 mm with upper/lower deviations +0.040/0.000 mm. Its mating shaft has minimum clearance 0.01 mm and tolerance 0.03 mm. Find maximum…
- GATE 2021 PI Q45 – GO and NO GO snap gauges are specified for a shaft 36.000 mm with deviations +0.070/+0.010 mm. Gauge tolerance is 5% of the stated “hole tolerance”.…
- GATE 2022 PI Q31 – Absolute surface deviations from a datum line are 10,15,12,10,13,12,20,25 µm. Find RMS roughness in µm to one decimal.
- GATE 2022 PI Q42 – An assembly has hole size 25.000 mm with upper/lower deviations +0.002/−0.001 mm and shaft size 25.000 mm with deviations +0.001/−0.003 mm. Identify…
- GATE 2022 PI Q56 – Two spherical steel balls of diameters 3 and 4 cm are placed in a cylindrical cavity as shown. The bigger ball is above the smaller one. Cavity depth…
- GATE 2023 PI Q23 – The surface-texture symbol is shown, with all values in µm. Find the difference between maximum and minimum surface roughness Rₐ.
- GATE 2024 PI Q57 – A single-start metric thread has calculated pitch 1.4 mm from a two-wire pitch-diameter measurement. Find best-wire diameter (two decimal mm).
- GATE 2025 PI Q35 – Hole dimensions are 30+0.04 -0.02 mm and shaft dimensions 30+0.06 +0.03 mm. Find maximum possible clearance (two decimal mm).
- GATE 2025 PI Q61 – A vernier’s zero lies between main divisions 20 and 21; its fourth division coincides with a main division. Five vernier divisions equal four main…
- GATE 2026 PI Q17 – Match instruments P: sine bar; Q: profilometer; R: vernier calliper; S: ring GO gauge, with applications 1: milled planar-surface roughness; 2:…
- GATE 2026 PI Q40 – A student determines flatness and parallelism of a part’s top surface from the shown cross-section, uniform in Z. Which statement is correct?
- GATE 2026 PI Q54 – A 2D stylus profilometer measures a 0.8 mm surface profile. The graph uses vertical magnification 10000 and horizontal magnification 100. Areas…
- GATE 2026 PI Q63 – All sizes are mm. Hole limits are 22+0.018 +0.010 and shaft limits are 22+0.075 +0.004. Find clearance magnitude when shaft is at minimum material…