Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Assuming a horizontal roller chain drive is used to transmit power to the jack shaft of a crane, for proper tension, the roller chain should have __________.

No slack
A tight fit
A small amount of sag
A rigid attachment

The correct answer is: A small amount of sag

For a roller chain drive, having a small amount of sag is essential for proper tensioning. This slight sag allows the chain to operate smoothly while accommodating any movement that might occur during operation. If the chain were to be completely taut or exhibit no slack, it could lead to excessive strain on both the chain and the sprockets, potentially causing premature wear or failure of components. The necessity for some sag also provides a buffer for thermal expansion and contraction of the chain due to temperature changes during operation, as well as any elongation that might occur over time. This slight flexibility helps maintain proper tension across the chain, ensuring efficient power transmission without overloading the drive components or interrupting the operation of the crane mechanism.