You are assigned to an offshore supply...

You are assigned to an offshore supply...

Question 1 of 29218673956e598d45f16831b6d2f

You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 720 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0005

Question 1 of 29218

Q

You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 720 rpm, what will be the rotational speed of the two camshafts? Illustration MO-0005

No Illustration

This question does not have an illustration

🔍 Key Concepts

• Relationship between crankshaft speed and camshaft speed in a four-stroke diesel engine • How many crankshaft revolutions are needed to complete one full engine cycle (intake, compression, power, exhaust) • What the illustration shows about valve operation and camshaft location on this V-type engine

💭 Think About

• From the picture, decide whether this is a two-stroke or four-stroke engine based on the valve arrangement and ports • Ask yourself: for one complete engine cycle, how many turns does the crankshaft make compared with how many turns the camshafts must make to open/close the valves correctly? • Once you know that ratio, apply it to a crankshaft speed of 720 rpm to find the camshaft speed

✅ Before You Answer

• Confirm from the illustration that there are valves operated by cams (not just ports in the cylinder wall) • Decide whether one full engine cycle requires 360° or 720° of crankshaft rotation • Use the correct speed ratio between the crankshaft and camshafts before choosing among 360, 720, or 1440 rpm