438) In a belt drive, the velocity ratio is the inverse ratio of the diameters of driving and driven pulleys.

439) In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

440) The bearing characteristic number in a hydrodynamic bearing depends upon

441) A spring is used to

442) When the top of a tooth undercuts the root on the mating gear, it is known as interference.