A diesel engine with a full speed of 1000...

A diesel engine with a full speed of 1000...

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Question 1 of 205eccefa3bacbc34ba4d47ccd

A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?

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A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?

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🔍 Key Concepts

• Speed reduction gear ratio compares input speed (engine) to output speed (propeller) • How to express a ratio when one number is larger than the other (e.g., "X to 1") • Basic division: engine RPM ÷ propeller RPM

💭 Think About

• Which number in the problem is the input speed and which is the output speed of the reduction gear? • If the engine turns 1000 times while the propeller turns 300 times, how many engine turns happen for each single turn of the propeller? • When you compute the ratio, should it be written as "engine : propeller" or "propeller : engine" for a reduction gear?

✅ Before You Answer

• Be sure you divide engine RPM by propeller RPM, not the other way around • Confirm your final number is written as "X to 1" (e.g., 2.5 to 1), not "0.X to 1" for a reduction gear where the engine is faster • Double‑check the arithmetic: 1000 ÷ 300 = ? and then match that value to the closest answer choice format

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