Hypoid gears have the following characteristics.
(a) Curved teeth
(b) Mounted on non -parallel non intersecting shafts
(c) Efficiency of 97%
(d) All of the mentioned
I was tested on this in an online quiz.
This advanced question is from the Bevel Gears section in part Bevel Gears, Worm Gears and FlyWheel of Machine Design