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Key Facts: GASM Uzakyol Vardiya Mühendisi Exam
100
Practice Questions
Study Adaptation
STCW III/1
International Standard
IMO STCW Convention
60-70%
Subject Pass Mark
GASM Examination Directive
4 Modules
Examination Structure
GASM Curriculum
Unlimited kW
Propulsion Rating
UAB Gemiadamları Yönetmeliği
This question bank provides independent English-language MCQ practice for the Turkish GASM Uzakyol Vardiya Mühendisi (Engineer OOW Unlimited) certification. It features 100 practice questions spanning two-stroke and four-stroke propulsion, auxiliary boilers and fluid systems, marine electrical automation, STCW watchkeeping standards, and MARPOL compliance.
Sample GASM Uzakyol Vardiya Mühendisi Practice Questions
Try these sample questions to review concepts for the GASM Uzakyol Vardiya Mühendisi exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1What is the primary function of the diaphragm plate and piston rod stuffing box in a two-stroke crosshead marine diesel engine?
A.To completely isolate the open combustion and scavenge spaces from the crankcase lubrication system
B.To provide hydraulic dampening for the reciprocating motion of the crosshead guide shoes
C.To inject high-pressure cylinder oil directly onto the piston crown during the power stroke
D.To transfer lateral side-thrust directly from the connecting rod to the cylinder liner walls
Explanation: In large two-stroke crosshead engines, the diaphragm plate fitted with a piston rod stuffing box separates the scavenge air space from the crankcase. The scraper rings and sealing rings prevent combustion residues, acidic cylinder oil, and scavenge sludge from contaminating the main crankcase system oil, while wiping clean crankcase oil back down. Trunk piston engines lack this barrier, requiring system oil with higher detergency.
2A 6-cylinder single-acting two-stroke marine diesel engine has a cylinder bore of 0.50 m, stroke of 1.80 m, and operates at 120 RPM. If indicator cards show an indicated mean effective pressure (IMEP) of 1.60 MPa (16.0 bar), calculate the total Indicated Power of the engine.
A.3,393 kW
B.5,429 kW
C.6,786 kW
D.13,572 kW
Explanation: Indicated Power P_i = IMEP * L * A * N * n. Cross-sectional area A = pi * (0.50)^2 / 4 = 0.19635 m^2. Stroke L = 1.80 m. In a 2-stroke engine, there is 1 power stroke per revolution, so firing frequency N = 120 / 60 = 2.0 rev/s. Power per cylinder = 1600 kPa * 1.80 m * 0.19635 m^2 * 2.0 = 1,130.98 kW. For n = 6 cylinders, total P_i = 6 * 1,130.98 = 6,786 kW.
3During a sea trial, a propulsion shaft torsionmeter indicates a torque of 750 kNm while the main engine turns at 105 RPM. What is the delivered shaft brake power?
A.7,422 kW
B.8,247 kW
C.9,115 kW
D.10,450 kW
Explanation: Brake power is calculated using P = 2 * pi * N * T / 60. Here, N = 105 RPM and T = 750 kNm (750,000 Nm). P = 2 * 3.14159 * 105 * 750 / 60 = 8,246.7 kW, which rounds to 8,247 kW.
4A main propulsion diesel engine develops 10,000 kW brake power while consuming 1,900 kg/h of heavy fuel oil with a lower calorific value (LCV) of 42,700 kJ/kg. What is the brake thermal efficiency of the engine?
A.38.5%
B.41.2%
C.48.9%
D.44.4%
Explanation: Thermal efficiency eta_b = Work Output / Heat Input. Heat input rate = mass fuel rate * LCV = (1,900 kg / 3,600 s) * 42,700 kJ/kg = 0.52778 kg/s * 42,700 kJ/kg = 22,536.1 kW. Brake thermal efficiency = 10,000 kW / 22,536.1 kW = 0.4437 or 44.4%.
5A bulk carrier main engine operates at an average load of 12,500 kW with a specific fuel oil consumption (SFOC) of 175 g/kWh. How many metric tonnes of fuel oil will the engine consume in a 24-hour sea passage?
A.52.5 tonnes
B.50.0 tonnes
C.55.2 tonnes
D.58.8 tonnes
Explanation: Total fuel mass = Power * SFOC * time = 12,500 kW * 175 g/kWh * 24 h = 52,500,000 grams. Converting to metric tonnes (1 tonne = 1,000,000 g): 52,500,000 / 1,000,000 = 52.5 metric tonnes.
6What is the primary operational advantage of fitting a Variable Injection Timing (VIT) mechanism to a marine diesel engine fuel pump?
A.It delays injection at high loads to prevent cylinder head mechanical thermal stress
B.It allows the fuel pump to deliver heavy fuel oil without heating or viscosity control
C.It advances fuel injection timing at partial loads (between 40% and 90%) to maintain maximum cylinder pressure (P_max) and reduce SFOC
D.It eliminates the need for high-pressure fuel injectors by using low-pressure atomization
Explanation: VIT systems adjust fuel injection start timing by altering the barrel or spill sleeve position based on engine load. By advancing injection start at part load (40-90%), peak combustion pressure (P_max) is kept near its maximum allowable design level, which improves combustion efficiency and reduces specific fuel oil consumption.
7In a marine engine starting air system, which safety device is specifically installed on the main starting air branch line to each cylinder to prevent a starting air line explosion from traveling back to the air manifold?
A.An oil mist detector sampling valve
B.A cylinder starting air non-return valve combined with a flame arrester or relief valve
C.A pilot air pressure regulator with moisture drain
D.A quick-closing pneumatic fuel stop valve
Explanation: If a cylinder starting air valve leaks or sticks open during combustion, hot burning gas and fuel can blow back into the starting air pipe where lubricating oil residue may be present. A cylinder non-return starting valve and burst disc/relief valve with flame arrester prevents flame propagation back into the main air manifold.
8What combination of conditions is the primary cause of starting air line explosions in marine diesel engines?
A.Accumulated lubricating oil vapor from the air compressor combining with leaking combustion gas past a stuck-open cylinder starting valve
B.High ambient engine room humidity entering the compressor suction silencer
C.Excessive starting air pressure exceeding the air receiver relief valve setpoint of 30 bar
D.Overcooling of starting air in the compressor intercooler leading to dense oxygen pockets
Explanation: Compressor carryover coats the interior of starting air piping with a thin film of lubricating oil. If a cylinder starting air valve sticks open or leaks, incandescent combustion gases blow back into the starting air line, igniting the oil-air mixture and initiating a violent explosion.
9During a sea watch, you observe a rapid rise in exhaust gas temperature on cylinder No. 4, accompanied by high scavenge air temperature alarms, turbocharger surging, and black smoke at the funnel. What casualty is occurring, and what is the immediate watch action?
A.Crankcase bearing wipe; immediately trip the emergency stop button and vent the crankcase
B.Cylinder liner cracking; increase jacket water expansion tank makeup flow immediately
C.Turbocharger turbine blade loss; shut down the main engine auxiliary blower
D.Scavenge space fire; immediately reduce engine speed, cut off fuel injection to the affected cylinder, and prepare boundary cooling and smothering
Explanation: Accumulated unburned cylinder oil and carbon sludge in the scavenge space can be ignited by blow-by gases from worn piston rings, causing a scavenge fire. Immediate actions are to slow down the engine, cut off fuel to the affected cylinder, inform the bridge, engage auxiliary blowers if necessary, check scavenge drains, and use fixed CO2/steam smothering if the fire persists.
10What is the sequence of events leading to a secondary crankcase explosion, and why is opening crankcase doors immediately after an oil mist alarm strictly prohibited?
A.Oil mist is formed by cold lube oil splashing against the crankcase walls; opening doors allows mist to condense safely
B.A hot spot vaporizes lubricating oil, which condenses into a white explosive mist (primary explosion); opening crankcase doors admits fresh air/oxygen, triggering a much more violent secondary explosion
C.The crankcase vacuum relief valve opens outward, allowing exhaust gas to ignite the sump oil directly
D.High scavenge pressure forces nitrogen into the sump, which reacts violently with crankcase oil when exposed to atmospheric light
Explanation: Overheated bearings or guide surfaces (hot spots exceeding 200°C) vaporize oil splashing onto them. As this vapor circulates to cooler parts of the crankcase, it condenses into sub-micron oil droplets (white oil mist). If ignited, a small primary explosion creates a pressure wave followed by a vacuum. Opening the doors admits a rush of fresh air (oxygen), triggering a catastrophic secondary explosion. The engine must be slowed/stopped and allowed to cool thoroughly before opening doors.
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