Q.

Which of the following statement is incorrect?

A. For columns, the solid round bar is less economical than the turbular section
B. The radius of gyration for the tubular section in all directions remains the same
C. A tubular section is most economical for the column free to buckle in any direction
D. none of the above
E. Increasing the diameter of threaded portion
Answer» D. none of the above
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