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100+ Free SAMSA Second Engineer CoC Practice Questions
South African Maritime Safety Authority STCW Section A-III/2 Second Engineer Officer Certificate of Competency practice questions are available now; exam metadata is being verified.
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Sample SAMSA Second Engineer CoC Practice Questions
Try these sample questions to test your SAMSA Second Engineer CoC exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A 6-cylinder 2-stroke marine diesel engine has a cylinder bore of 0.70 m, stroke of 2.4 m, and runs at 100 rpm. If the mean indicated pressure (MIP) is 1.8 MPa, what is the total indicated power developed by the engine?
A.16,625 kW
B.8,312 kW
C.33,250 kW
D.12,468 kW
Explanation: Piston area A = π × (0.35)² = 0.3848 m². Work per stroke = P × L × A = 1.8 × 10⁶ N/m² × 2.4 m × 0.3848 m² = 1.6625 × 10⁶ J per cylinder per revolution. For a 2-stroke engine at 100 rpm (1.667 rev/s), Indicated Power per cylinder = 1.6625 × 10⁶ × (100 / 60) = 2,771 kW. For 6 cylinders, Total Indicated Power = 6 × 2,771 kW = 16,625 kW.
2What is the primary function of Variable Injection Timing (VIT) in modern marine 2-stroke engine fuel pumps?
A.To retard fuel injection timing at full load to prevent high exhaust gas temperatures
B.To advance fuel injection timing at partial load to maintain maximum combustion pressure (Pmax) near its rated value
C.To decrease fuel pump plunger stroke at idling speeds
D.To vary the fuel oil viscosity before entering the fuel injector
Explanation: VIT advances injection timing during partial engine load (typically between 40% and 85% MCR) so that maximum firing pressure (Pmax) remains close to its allowable limit. This lowers specific fuel oil consumption (SFOC) at part-load operation. At full load, VIT retards timing back to normal to prevent over-pressurizing the engine structure.
3Upon detecting a scavenge trunk fire on a 2-stroke main engine, what immediate action should be taken by the engineer officer on watch?
A.Immediately open scavenge inspection doors to inspect the extent of the fire
B.Speed up the engine to blow out the accumulation of unburnt oil
C.Slow down the engine, stop fuel to affected cylinder, engage turning gear cooling, and apply fixed extinguishing medium if fire persists
D.Increase cylinder lubrication oil feed rate to the maximum on all cylinders
Explanation: When a scavenge fire occurs, the engine load and speed must be reduced immediately, fuel to the affected cylinder cut off, and cylinder lubrication adjusted. If the fire is severe, the engine is stopped and fixed extinguishing medium (such as steam, CO2, or water mist) is injected. Scavenge doors must remain closed until the engine cools down to prevent air ingress and explosive backdraft.
4When analyzing a main engine draw card (out-of-phase indicator diagram), what does a abnormally high peak firing pressure (Pmax) accompanied by heavy diesel knock indicate?
A.Engine compression pressure (Pcomp) is too low
B.Fuel injection timing is excessively retarded
C.Fuel injector nozzles are severely choked
D.Fuel injection timing is excessively advanced
Explanation: Advanced injection timing initiates combustion too far before top dead center (TDC). This causes fuel to ignite while the piston is still ascending, creating excessively high peak firing pressure (Pmax), severe shock loading on bearings, and characteristic diesel knocking sound.
5Following a crankcase oil mist alarm and main engine shutdown, how long must the engine room staff wait before opening crankcase doors?
A.At least 20 minutes to allow hot spots to cool below the oil vapor ignition temperature
B.Immediately, to locate and extinguish the hot spot before damage occurs
C.Exactly 5 minutes after stopping the fuel supply
D.No waiting period is needed if forced crankcase extraction fans are running
Explanation: Opening crankcase doors immediately after an oil mist alarm allows atmospheric oxygen to rush into an oil-vapor-rich enclosure containing hot engine components. A minimum cooling period of 20 to 30 minutes is required to ensure hot spots drop below the ignition temperature of the oil mist, preventing a violent crankcase secondary explosion.
6Where is maximum cylinder liner wear typically measured during a main engine overhaul?
A.At the exact midpoint of the piston stroke
B.Near top dead center (TDC) position of the top piston ring
C.Near bottom dead center (BDC) below the scavenge ports
D.Uniformly along the entire length of the liner
Explanation: Maximum cylinder liner wear occurs near the TDC position of the upper piston ring. At TDC, gas pressure behind the top ring is highest, lubrication film is thin due to high temperature and zero piston velocity at reversal, and sulfuric acid condensation is most severe.
7In heavy fuel oil operation, high-temperature corrosion of main engine exhaust valve seats is predominantly caused by which chemical combination?
A.Sulfur and Nitrogen forming high-pressure nitric acid
B.Calcium and Carbon residues forming hard abrasive ash
C.Vanadium and Sodium compounds forming low melting point salts
D.Silicon and Aluminum catalyst fines embedding in the valve face
Explanation: Vanadium and sodium present in residual heavy fuel oil combine during combustion to form low melting point complex salts (e.g., sodium vanadyl vanadates). These salts melt on hot exhaust valve seating surfaces (above ~530°C), stripping protective oxide layers and causing rapid hot corrosion and localized guttering.
8Why do 2-stroke marine diesel engines require an independent high-pressure crosshead lubrication pump?
A.Because the main lubricating oil pump cannot operate above 2 bar pressure
B.To increase the speed of oil flow through the main crankshaft journal bearings
C.To cool the turbocharger bearings after main engine shutdown
D.Because crosshead bearing load is unidirectional and lacks the dynamic pressure reversal found in 4-stroke engines
Explanation: In 2-stroke engines, gas pressure acts downward on the piston throughout the cycle, keeping the crosshead pin continuously pressed against the lower bearing shell without load reversal. A booster pump supplying high-pressure oil (10 to 12 bar) is required to force hydrodynamic oil into the bearing interface.
9What is the fundamental cause of main engine turbocharger surging?
A.Breakdown of airflow through the compressor when air delivery pressure exceeds the aerodynamic pumping capacity
B.Excessive lubricating oil pressure supplied to turbocharger bearings
C.Operating the main engine at light load with clean air filters
D.Fouling of the turbine exhaust gas outlet pipe after the economizer
Explanation: Surging occurs when air pressure downstream of the compressor exceeds the pressure created by compressor blades. Air flow momentarily reverses back through the compressor wheel, causing violent air oscillations, loud banging noises, and thermal overload of turbine components.
10A main engine produces a continuous shaft power of 12,000 kW and consumes 48.96 tonnes of heavy fuel oil per day. Calculate the Specific Fuel Oil Consumption (SFOC) of the engine.
A.185.2 g/kWh
B.170.0 g/kWh
C.160.5 g/kWh
D.204.0 g/kWh
Explanation: Daily fuel consumption = 48,960 kg in 24 hours. Hourly fuel consumption = 48,960 / 24 = 2,040 kg/h = 2,040,000 g/h. SFOC = Hourly Fuel Mass / Power = 2,040,000 g/h / 12,000 kW = 170.0 g/kWh.
About the SAMSA Second Engineer CoC Practice Questions
Verified exam format metadata for South African Maritime Safety Authority STCW Section A-III/2 Second Engineer Officer Certificate of Competency is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.