ISRO Mechanical & Aerospace 2017 - Question 55

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Topic: Manufacturing

The missing dimension in the following simple part is

Figure for question 55, ISRO Mechanical & Aerospace 2017

  • A. 11.5 ± 1.5
  • B. 11.5 ± 2.5
  • C. 11.5 ± 3.5
  • D. 11.5 ± 4.5

Answer: C. 11.5 ± 3.5

Explanation: This is a tolerance stack-up problem. AB_avg = 57 - 17 - 17.5 - 11 = 11.5. The tolerance is the sum of individual tolerances: 1.5(CD)+0.5(EA)+0.5(GF)+0.5(BG) = 3.5. So, AB = 11.5 ± 3.5.

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