Helical
gears have their teeth:
Inclined
to wheel rim
Straight
over the wheel rim
Curved
over the wheel rim
Cut
on the surfaces of the frustum of cones
Curved
over the wheel rim
In helical gear, the teeth are curved each being helical in shape. Two mating gears have the same helix angle but have teeth of opposite hands.
Hence,
the correct option is (C).
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