The shaft angle of two helical gears is 60°. The normal module is 6 mm. The larger gear has 50 teeth and the gear ratio is 2. The centre distance is 300 mm. Find the helix angles of the two gears.

Find the spiral angles of the two helical gears for maximum efficiency if the shaft angle is 100° and the friction angle is 10°.

Find the normal circular pitch as well as the normal module if the larger gear has 40 teeth and the gear ratio is 4. The helix angle is 20° and the shaft angle is 50°. Assume the centre distance between the gears to be 200 mm.

The normal circular pitch of two helical gears in a mesh is 7 mm. If the number of teeth on the smaller gear is 22 and the gear ratio is 2, find the pitch diameters of the gears. Ψ₁ = 40° and Ψ₂ = 25°.

For two gears having shaft angle 90° and friction angle 6°, find the maximum efficiency of the helical gears.

When large gear reductions are needed _________ gears are used.

The driven gear in the worm gear is a helical gear. True or false?

Which is of these is an advantage of worm gear?

The distance between corresponding points on adjacent teeth measured along the direction of the axis is called ____________

The distance by which a helix advances along the axis of the gear for one turn around is called _____________

The angle at which the teeth are inclined to the normal of the axis of rotation is called _______________