27 real GD&T questions from the Mechanical Design bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Datum reference frame?
Junior
A.position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears
B.three mutually perpendicular planes built from primary, secondary and tertiary datum features that lock all six degrees of freedom
C.form tolerance zone between two parallel planes within which all points of a surface must lie, requiring no datum
D.two-tier feature control frame in which the upper segment locates the hole pattern and the lower, tighter segment refines hole-to-hole spacing
2. Which term means: "three mutually perpendicular planes built from primary, secondary and tertiary datum features that lock all six degrees of freedom"?
A.Datum reference frame — position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears
B.Datum reference frame — two-tier feature control frame in which the upper segment locates the hole pattern and the lower, tighter segment refines hole-to-hole spacing
C.Datum reference frame — extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies
D.Datum reference frame — three mutually perpendicular planes built from primary, secondary and tertiary datum features that lock all six degrees of freedom
5. Which term means: "rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence"?
A.Feature control frame — position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears
B.Feature control frame — circled M that lets the geometric tolerance grow as the feature departs from its maximum material size toward least material
C.Feature control frame — three mutually perpendicular planes built from primary, secondary and tertiary datum features that lock all six degrees of freedom
D.Feature control frame — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
A.Flatness — circled M that lets the geometric tolerance grow as the feature departs from its maximum material size toward least material
B.Flatness — form tolerance zone between two parallel planes within which all points of a surface must lie, requiring no datum
C.Flatness — two-tier feature control frame in which the upper segment locates the hole pattern and the lower, tighter segment refines hole-to-hole spacing
D.Flatness — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
11. Which term means: "where only a size tolerance is given, the surface may not extend beyond the envelope of perfect form at maximum material condition"?
A.Rule #1 (envelope principle) — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
B.Rule #1 (envelope principle) — form tolerance zone between two parallel planes within which all points of a surface must lie, requiring no datum
C.Rule #1 (envelope principle) — where only a size tolerance is given, the surface may not extend beyond the envelope of perfect form at maximum material condition
D.Rule #1 (envelope principle) — extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies
14. Which term means: "cylindrical zone around the true position within which a feature's axis must lie, giving 57% more usable area than a square ± coordinate box"?
A.Position tolerance — three mutually perpendicular planes built from primary, secondary and tertiary datum features that lock all six degrees of freedom
B.Position tolerance — cylindrical zone around the true position within which a feature's axis must lie, giving 57% more usable area than a square ± coordinate box
C.Position tolerance — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
D.Position tolerance — where only a size tolerance is given, the surface may not extend beyond the envelope of perfect form at maximum material condition
A.Maximum material condition modifier — where only a size tolerance is given, the surface may not extend beyond the envelope of perfect form at maximum material condition
B.Maximum material condition modifier — circled M that lets the geometric tolerance grow as the feature departs from its maximum material size toward least material
C.Maximum material condition modifier — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
D.Maximum material condition modifier — extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies
20. Which term means: "extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies"?
A.Bonus tolerance — extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies
B.Bonus tolerance — rectangular box read left to right containing the geometric symbol, tolerance value with modifiers, and datum references in order of precedence
C.Bonus tolerance — form tolerance zone between two parallel planes within which all points of a surface must lie, requiring no datum
D.Bonus tolerance — cylindrical zone around the true position within which a feature's axis must lie, giving 57% more usable area than a square ± coordinate box
23. Which term means: "two-tier feature control frame in which the upper segment locates the hole pattern and the lower, tighter segment refines hole-to-hole spacing"?
A.Composite position tolerance — extra geometric tolerance equal to the difference between the actual mating size and the MMC size when an MMC modifier applies
B.Composite position tolerance — two-tier feature control frame in which the upper segment locates the hole pattern and the lower, tighter segment refines hole-to-hole spacing
C.Composite position tolerance — circled M that lets the geometric tolerance grow as the feature departs from its maximum material size toward least material
D.Composite position tolerance — position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears
26. Which term means: "position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears"?
A.Projected tolerance zone — where only a size tolerance is given, the surface may not extend beyond the envelope of perfect form at maximum material condition
B.Projected tolerance zone — cylindrical zone around the true position within which a feature's axis must lie, giving 57% more usable area than a square ± coordinate box
C.Projected tolerance zone — form tolerance zone between two parallel planes within which all points of a surface must lie, requiring no datum
D.Projected tolerance zone — position zone extended above the part surface by the mating part's thickness, used for tapped holes and press-fit pins so the fastener clears
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