The shear stress at the center of a circular shaft under torsion is

A lap joint is always in _________ shear.

A. Single

B. Double

C. Both A and B

D. None of these

A pressure vessel is said to be a thin shell when the ratio of wall thickness of the vessel to its diameter is __________ $$\frac{1}{{10}}.$$

A. Equal to

B. Less than

C. Greater than

D. None of these

A simply supported beam with a gradually varying load from zero at ‘B’ and ‘w’ per unit length at ‘A’ is shown in the below figure. The shear force at ‘B’ is equal to

A. $$\frac{{{\text{w}}l}}{6}$$

B. $$\frac{{{\text{w}}l}}{3}$$

C. $${\text{w}}l$$

D. $$\frac{{2{\text{w}}l}}{3}$$

The columns whose slenderness ratio is less than 80, are known as

A. Short columns

B. Long columns

C. Weak columns

D. Medium columns