Discussion
When assembled, the hole \(30^{+0.030}_{+0.000}\) mm and shaft \(30^{+0.020}_{-0.020}\) mm will result in
Answer: C
The assembly is a transition fit.
The hole ranges from 30.000 to 30.030 mm and the shaft from 29.980 to 30.020 mm.
\[ \begin{aligned} \text{max clearance} &= 30.030 - 29.980 = 0.050\ \text{mm} \\ \text{max interference} &= 30.020 - 30.000 = 0.020\ \text{mm} \end{aligned} \]
Because the tolerance zones overlap, a given pair may have clearance or interference, which is the definition of a transition fit. A clearance (loose) fit would need the largest shaft below the smallest hole, and an interference fit the smallest shaft above the largest hole.
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