Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?
Correct answer: D. 40
- A. 10
- B. 20
- C. 30
- D. 40
Explanation
Using the standard boiler-joint rule that the rivet diameter is approximately twice the plate thickness, d = 2(20) = 40 mm. This gives option d.
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