GMA CoC EOOW Practice Questions - Ghana Maritime Authority Certificate of Competency - Engineer Officer of the Watch Exam - GMA CoC EOOW Practice Questions - Ghana Maritime Authority Certificate of Competency

Question 1

What is the primary cause of a scavenge space fire in a large two-stroke crosshead marine diesel engine?

Accumulation of unburnt cylinder oil and carbonaceous deposits ignited by blow-by of hot combustion gases. Excessive fuel injection pressure causing cylinder overload. Failure of the piston rod stuffing box gland seals allowing crankcase oil to enter. High exhaust gas backpressure due to a fouled turbocharger nozzle ring.

Correct Answer:

Accumulation of unburnt cylinder oil and carbonaceous deposits ignited by blow-by of hot combustion gases.

Question 2

What is the immediate action to take if a scavenge space fire is detected in a running main propulsion diesel engine?

Slow down the engine, cut off fuel to the affected cylinder(s), close the scavenge air drains, and inject extinguishing medium (such as CO2 or steam). Stop the engine immediately and open all crankcase inspection doors to check for overheating. Increase engine speed to blow the carbon deposits out through the exhaust gas receiver. Open the scavenge air drains fully to drain the accumulating lube oil and relieve pressure.

Correct Answer:

Slow down the engine, cut off fuel to the affected cylinder(s), close the scavenge air drains, and inject extinguishing medium (such as CO2 or steam).

Question 3

Why must you wait at least 20 to 30 minutes after a main diesel engine has stopped due to suspected hot spot before opening crankcase doors?

To allow the hot spot to cool below the ignition temperature of the oil mist, preventing a catastrophic explosion from air ingress. To allow the lube oil pump to scavenge all remaining oil from the crankcase sump. To allow the starting air pressure in the air receivers to bleed down to safe levels. To allow the cylinder liners to cool evenly, preventing thermal cracking of the engine frame.

Correct Answer:

To allow the hot spot to cool below the ignition temperature of the oil mist, preventing a catastrophic explosion from air ingress.

Question 4

What is the function of a crankcase oil mist detector (OMD) on a marine diesel engine?

To detect concentration of oil mist in the crankcase and warn of developing hot spots before an explosion can occur. To measure the oil level in the main sump tank automatically. To monitor the viscosity and water content of the lubricating oil during engine operation. To control the rate of cylinder oil injection based on engine load.

Correct Answer:

To detect concentration of oil mist in the crankcase and warn of developing hot spots before an explosion can occur.

Question 5

In a diesel engine indicator diagram, what does a low compression pressure coupled with a low maximum combustion pressure generally indicate?

Leaking piston rings, worn cylinder liners, or leaking exhaust valves. Late fuel injection timing or fouled fuel injectors. Excessive fuel injection pump delivery or high fuel index. Early fuel injection timing causing pre-ignition.

Correct Answer:

Leaking piston rings, worn cylinder liners, or leaking exhaust valves.

Question 1

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Prepare with the GMA CoC EOOW Practice Questions - Ghana Maritime Authority Certificate of Competency - Engineer Officer of the Watch Exam practice quiz. This question bank includes 100 questions covering engine, marine, function, diesel, and valve. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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GMA CoC EOOW Practice Questions - Ghana Maritime Authority Certificate of Competency - Engineer Officer of the Watch Exam

This practice set contains 100 questions from the matching question bank and focuses on engine, marine, function, diesel, and valve. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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GMA CoC EOOW Practice Questions - Ghana Maritime Authority Certificate of Competency - Engineer Officer of the Watch Exam

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