Helical gears are preferred over spur gears...

Question 1 / 270705eccefa1bacbc34ba4d47193

Question 1 of 270705eccefa1bacbc34ba4d47193

Helical gears are preferred over spur gears for steam turbine reduction gear units due to the fact that they __________.

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Question 1 of 27070

Helical gears are preferred over spur gears for steam turbine reduction gear units due to the fact that they __________.

🔍 Key Concepts

• differences between spur gears and helical gears • effects of tooth shape and angle on gear operation • behavior of gears at high rotational speeds, such as in steam turbine reduction units

💭 Think About

• Think about what happens when straight-tooth gears mesh at very high speed compared to angled-tooth gears. • Which gear feature would most affect smoothness of power transmission between turbine and shaft? • Among the choices, which effect is most directly tied to tooth engagement characteristics rather than overall shaft or system design?

✅ Before You Answer

• Review how helical tooth engagement differs from spur (straight) tooth engagement over time. • Consider which option is a primary operational advantage of helical gears, not just a possible side benefit. • Eliminate any choices that refer to conditions (like torsional stress or pinion deflection) that depend more on shaft design and loading than on gear tooth angle alone.

Question 1 of 27070

Helical gears are preferred over spur gears for steam turbine reduction gear units due to the fact that they __________.

prevent torsional stress

eliminate pinion deflection

produce less noise and vibration

be easier to lubricate at high speeds