SAMSA OICEW Practice Questions - SAMSA Certificate of Competency Officer in Charge of an Engineering Watch (STCW Section A-III 1) Exam - SAMSA OICEW Practice Questions - SAMSA Certificate of Competency Officer in Charge of an Engineering Watch (STCW Section A-III 1) Exam

Question 1

What is the primary operational difference between a two-stroke crosshead marine diesel engine and a four-stroke trunk piston engine?

A two-stroke crosshead engine completes a power cycle in one revolution of the crankshaft and isolates the crankcase from the cylinder scavenge space. A two-stroke crosshead engine requires two revolutions of the crankshaft for each power stroke and shares crankcase oil with cylinder oil. A four-stroke trunk piston engine isolates combustion side-thrust from the cylinder liner walls using a crosshead pin and guide shoe. A two-stroke engine uses intake and exhaust valves exclusively without scavenge ports.

Correct Answer:

A two-stroke crosshead engine completes a power cycle in one revolution of the crankshaft and isolates the crankcase from the cylinder scavenge space.

Question 2

A 6-cylinder single-acting 2-stroke diesel engine has a bore of 0.6 m, stroke of 2.0 m, and operates at 100 RPM. If the indicated mean effective pressure (IMEP) is 1.5 MPa (15 bar), calculate the total Indicated Power of the engine.

2,545 kW 4,241 kW 5,089 kW 8,482 kW

Correct Answer:

4,241 kW

Question 3

During engine indicator card analysis, a draw card (out-of-phase diagram) is taken primarily to inspect which combustion parameter?

Exhaust manifold backpressure fluctuations during blowdown Total area under the main power loop to determine indicated power Compression pressure and firing pressure timeline near Top Dead Centre (TDC) Scavenge air receiver pressure during port opening

Correct Answer:

Compression pressure and firing pressure timeline near Top Dead Centre (TDC)

Question 4

What is the primary purpose of Variable Injection Timing (VIT) in modern marine diesel engines?

To bypass fuel oil back to the settling tank during engine maneuvering. To advance fuel injection timing at full load to increase exhaust gas temperature for turbocharger boost. To retard fuel injection timing at low loads to reduce scavenge receiver pressure. To maintain maximum firing pressure (Pmax) near its design limit at partial engine loads to improve fuel economy.

Correct Answer:

To maintain maximum firing pressure (Pmax) near its design limit at partial engine loads to improve fuel economy.

Question 5

A main engine produces 10,000 kW brake power while consuming 42 tonnes of heavy fuel oil per 24-hour period. Calculate the Brake Specific Fuel Consumption (BSFC) in g/kWh.

175.0 g/kWh 155.0 g/kWh 195.0 g/kWh 210.0 g/kWh

Correct Answer:

175.0 g/kWh

Question 1

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Prepare with the SAMSA OICEW Practice Questions - SAMSA Certificate of Competency Officer in Charge of an Engineering Watch (STCW Section A-III 1) Exam practice quiz. This question bank includes 100 questions covering engine, diesel, marine, main, and stroke. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SAMSA OICEW Practice Questions - SAMSA Certificate of Competency Officer in Charge of an Engineering Watch (STCW Section A-III 1) Exam

This practice set contains 100 questions from the matching question bank and focuses on engine, diesel, marine, main, and stroke. 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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SAMSA OICEW Practice Questions - SAMSA Certificate of Competency Officer in Charge of an Engineering Watch (STCW Section A-III 1) Exam

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