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A 10 mm deep cylindrical cup with diameter of 15 mm is drawn from a circular blank. Neglecting the variation in the sheet thickness, the diameter (upto 2 decimal points accuracy) of the blank is mm.
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- 24.72 mm
- 48.79 mm
- 28.72 mm
- 38.76 mm
Correct Option: C
Here d = 15 mm and h = 10 mm
Now, by formula
D = √d² × 4dh
= √(15)² + 4 × 15 ×10
= 28.72 mm
