10. (2) the smallest number of teeth on a 20" pressure angle spur gearset, unning with itselt, is: a 12 teeth 13 teeth c) 15 teeth d) 18 teeth e) none of these 11. (2) a 350 rpm bearing under 1600 i dynamic load must last 12,000 hours with 90% reliability. select one with load rating a) 5,050 ib b) 300 b c) 10,100 ib e) none of these 12. (2)is conserved across meshing a) angular velocity ) torque d) e) radial velocity none of these 13. (2) backlash can be a significant challenge with a) helical b spur c) spiral d) hypoid e) none of these 14. (2)gears are most efficient b) spiral spur 15. (2) gears come in both parallel or a) rack and pinion b) hypoid c) spiral differential e)helical