Question

A steel plate is 300 mm wide and 10 mm thick. If the diameter of the bolt hole is 20 mm, the net sectional area of the plate is:

• A. $30{\text{cm}}^2$
• B. $28{\text{cm}}^2$
• C. $28{\text{mm}}^2$
• D. $280{\text{mm}}^2$

Answer 1

The correct option is B $28{\text{cm}}^2$

Net sectional area $(300-20)10=2800{\text{mm}}^2$
$=28{\text{cm}}^2$