_________________ gears are used to obtain large speed reductions between nonintersecting shafts placed at 90-degree angles to one another.
a. Spur
b. Worm
c. Helical
d. Bevel
a. Incorrect. Spur gears are primarily used in low-power applications.
b. Correct. Worm gears are used to obtain large speed reductions between nonintersecting shafts, and they are generally nonreversible.
c. Incorrect. Helical gears are used in applications that require greater power (torque) and equipment size.
d. Incorrect. A bevel gear connects two intersecting shafts in any given speed ratio.
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