The fishing industry factory ship to which...

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Question 1 of 2066636eef28f7522a1c51f6cd

The fishing industry factory ship to which you are assigned has a main propulsion engine of the type shown in the illustration. In terms of piston action, operating cycle, and piston type, what statement is true concerning this engine type? Illustration MO-0069

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Question 1 of 20

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🔍 Key Concepts

• Single-acting vs double-acting pistons (how many sides of the piston see combustion pressure) • Opposed piston vs crosshead piston layouts (look at how many pistons share the cylinder and how the connecting rod is arranged) • How to recognize a two-stroke cycle in a large marine diesel (scavenge ports, exhaust valve, no intake valves)

💭 Think About

• From the illustration, count how many pistons are in this one cylinder and how many combustion spaces there are. Does combustion act on one face of the piston or on two? • Trace the force path from the piston crown down to the crankshaft. Do you see a separate piston rod and crosshead, or do the piston and connecting rod join directly? • Look along the cylinder liner: do you see scavenge/air ports in the liner and a single exhaust valve in the head, suggesting a uniflow two-stroke design, or do you see separate intake and exhaust valves for a four-stroke?

✅ Before You Answer

• Confirm whether there is only one piston in the cylinder or two pistons moving toward each other (opposed piston). • Check if there is a crosshead assembly between the piston rod and connecting rod (a block sliding in guides). • Verify if combustion occurs on one side only of the piston (single-acting) and whether there are scavenge ports plus one exhaust valve (typical of a large two-stroke marine diesel).

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