You are assigned to a platform supply vessel...

Question 1 / 2066636eef28f7522a1c51f6fe

Question 1 of 2066636eef28f7522a1c51f6fe

You are assigned to a platform supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0224

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🔍 Key Concepts

• Relationship between crankshaft and camshaft speed in a four-stroke diesel cycle • How many crankshaft revolutions are required to complete one full engine cycle for the valves and fuel injection shown in the illustration • Gear train ratio between the crankshaft gear and the camshaft gears in the drawing

💭 Think About

• From the valve and fuel-injection arrangement in the illustration, decide whether this is a two-stroke or four-stroke engine and how many crank revolutions make one complete cycle • Think about how often the intake and exhaust valves must open for each cylinder and how that translates into camshaft rotation compared with the crankshaft • Use the visible gear sizes between the crankshaft and camshafts to estimate whether the camshafts should turn faster, slower, or the same speed as the crankshaft

✅ Before You Answer

• Confirm whether the engine operates on a four-stroke or two-stroke cycle based on the scavenging, valve, and cam layout • Verify the gear ratio between the crankshaft gear and camshaft gears (look at relative gear diameters/teeth in the illustration) • Check that the camshaft completes the correct number of revolutions for each full engine cycle (compression + power + exhaust + intake) before choosing the rpm value

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Question 1 of 20

450 rpm

900 rpm

1800 rpm

Not enough information is given to determine camshaft rpm.

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Question 1 / 2066636eef28f7522a1c51f6fe

Question 1 of 2066636eef28f7522a1c51f6fe

Back

Question 1 of 20

66636eef28f7522a1c51f6fe

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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