For the same material and the mass, which of the following configurations of flywheel will have maximum mass moment of inertia about the axis of rotation $$OO’$$ passing through the center of gravity

The value of moment of inertia of the section shown in the figure about the axis-$$XX$$ is
$$All$$ $$dimensions$$ $$are$$ $$in$$ $$'mm'$$

A cylindrical tank with closed ends is filled with compressed air at a pressure of $$500 kP$$a. The inner radius of the tank is $$2 m,$$ and it has wall thickness of $$10 mm.$$ The magnitude of maximum in-plane shear stress (in $$MP$$a) is ________

A gear train is made up of five spur gears as shown in the figure. Gear $$2$$ is driver and gear $$6$$ is driven member. $${N_{2,}}{N_{3,}}{N_{4,}}{N_5}$$ and $${N_6}$$ represent number of teeth on gears $$2,3,4,5,$$ and $$6$$ respectively, The gear(s) which act(s) as idler(s) is/are