Question 518Steam Plants - Assistant Engineer

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What is the significance of pinion deflection in the operation of reduction gears?

APinion deflection causes unequal tooth loading.
BDeflection is minimal because a longer pinion is more rigid.
CDeflection causes excessive wear at the center of the pinion.
DDeflection causes excessive wear at both ends of the pinion.
AI Explanation

The correct answer is A) Pinion deflection causes unequal tooth loading. Explanation: Pinion deflection is a critical factor in the proper operation of reduction gears. When the pinion shaft deflects under load, it can cause unequal tooth loading across the width of the gear teeth. This unequal loading leads to accelerated wear and potential failure of the reduction gear system. A longer, more rigid pinion design (choice B) can help minimize deflection, but pinion deflection is still a concern that must be addressed in the design and operation of reduction gears. The other choices (C and D) are incorrect as they do not accurately describe the primary issue caused by pinion deflection.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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