A diesel engine is operating at 1800 RPM and...

A diesel engine is operating at 1800 RPM and...

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Question 1 of 205eccefa3bacbc34ba4d47cd8

A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?

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A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?

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🔍 Key Concepts

• Gear ratio (speed reduction ratio) compares engine RPM to propeller RPM • To find the ratio, always compare input speed (engine) to output speed (propeller) • Simplify the ratio to match the form in the answer choices

💭 Think About

• What simple fraction do you get if you put engine RPM over propeller RPM using 1800 and 600? • Once you have that fraction, how can you express it as "X to 1" so it matches the answer format? • Does the reduction ratio describe how many engine revolutions happen for each single propeller revolution?

✅ Before You Answer

• Be sure you are using engine RPM ÷ propeller RPM, not the other way around • Confirm the units cancel so you get a pure number (ratio), not RPM • Double-check that your final ratio is written as X to 1, not 1 to X

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