4. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
6. The frequency of oscillation of a compound pendulum is(where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)
A. is the turning effect produced by a force, on the body, on which it acts
B. is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
C. is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
