Engineering Mechanics
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

50
200
100
400

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Engineering Mechanics
The moment of a force

Is the turning effect produced by a force, on the body, on which it acts
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
All of these
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

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