Free Practice Questions for Croatia Chief Engineer Officer

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More Croatia Maritime Certificates of Competency (Svjedodžbe o osposobljenosti pomoraca — MMPI)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Croatia Master Mariner (Zapovjednik broda od 3000 BT — MMPI)

Practice Questions100 questions

Exam Review

Key Facts: Croatia Chief Engineer Officer Exam

STCW III/2

Regulation

IMO Standards

3000 kW+

Propulsion Power

Pravilnik o zvanjima pomoraca

5 Members

Exam Commission Size

Pravilnik NN 130/13 Art. 98

5 Years

Certificate Validity

STCW Convention

Written + Oral

Assessment Mode

MMPI Prilog C11

6 Modules

Statutory Subjects

Pravilnik Prilog C11

36 Months

Sea Service Route

Pravilnik Art. 35

MMPI

Licensing Authority

Republic of Croatia

The Croatia Chief Engineer Officer (Upravitelj stroja 3000 kW+) credential is a statutory marine engineering certificate issued by the Croatian Ministry of the Sea, Transport and Infrastructure (MMPI) under STCW Regulation III/2. Examination commissions assess marine propulsion engines, auxiliary machinery and steam boilers, electrical engineering and automation, engine-room management and leadership, maritime regulations, and Maritime English through the modes assigned in Prilog C11. This bank provides 100 English-language practice questions adapted for independent study.

Sample Croatia Chief Engineer Officer Practice Questions

Try these sample questions to review concepts for the Croatia Chief Engineer Officer exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A 6-cylinder, two-stroke marine diesel engine has a cylinder bore of 600 mm (0.60 m), a piston stroke of 2,000 mm (2.00 m), and operates at 100 RPM. Indicator card analysis reveals a mean indicated pressure (P_mi) of 18.0 bar across all cylinders. What is the total indicated power (P_i) developed by the engine?

A.10,179 kW

B.5,089 kW

C.12,215 kW

D.8,143 kW

Explanation: For a two-stroke engine, one power stroke occurs per revolution per cylinder. Indicated power is given by P_i = P_mi × L × A × n × z, where: P_mi = 18.0 bar = 1,800,000 N/m²; L = 2.0 m; Bore D = 0.6 m, so piston area A = (π/4) × (0.6)² = 0.282743 m²; engine speed n = 100 rev / 60 s = 1.6667 rev/s; number of cylinders z = 6. Substituting values: P_i = 1,800,000 × 2.0 × 0.282743 × 1.6667 × 6 = 10,178,748 W ≈ 10,179 kW.

2During main engine performance evaluation, an out-of-phase indicator diagram (draw card taken at 90° out of phase with the crank) is recorded. What is the primary operational diagnosis derived from this specific diagram?

A.Calculation of mean indicated pressure (P_mi) and total indicated engine power

B.Detection of exhaust valve leakage and scavenge manifold backpressure fluctuations

C.Evaluation of ignition delay, fuel injection timing, and rate of combustion pressure rise (dP/dθ)

D.Measurement of mechanical friction losses and compressor piston ring blow-by

Explanation: A draw card (out-of-phase diagram) is intentionally phased 90° away from top dead center (TDC), placing the combustion event where piston displacement change is fastest on the indicator drum. This spreads out the pressure-versus-crank-angle trace across TDC, allowing the marine engineer to clearly inspect fuel injection timing, fuel ignition delay, compression pressure (P_comp), peak cylinder pressure (P_max), and the rate of pressure rise (dP/dθ).

3Modern electronically controlled two-stroke marine diesel engines (such as MAN B&W ME-C and WinGD RT-flex) replace the conventional camshaft with hydraulic-electronic systems. What component provides the high-pressure motive force for fuel injection and exhaust valve actuation?

A.High-pressure pneumatic boosters fed directly from the main 30 bar starting air receivers

B.Individual high-speed solenoid servo actuators powered directly by 440 V three-phase motor drives

C.Dedicated mechanical pushrod rockers operated by variable-frequency electric stepper motors

D.An engine- or electrically driven hydraulic power supply providing high-pressure control oil at the pressure specified for that engine design

Explanation: Electronically controlled two-stroke engines use an engine- or electrically driven hydraulic power supply to provide the high-pressure control medium specified by the particular design. That energy is distributed to electronically triggered units that control fuel injection and exhaust-valve actuation. The detailed rail medium, pressure, and actuator names differ among engine families, so the maker's manual remains controlling.

4A scavenge space fire occurs in cylinder number 4 of a large two-stroke crosshead main engine. What is the fundamental root cause of this hazard?

A.Accumulation of unburnt fuel oil and cylinder lubricating oil residues in the scavenge space ignited by combustion blow-by

B.Premature ignition of rich scavenge air caused by an overloaded auxiliary scavenge blower

C.Excessive jacket cooling water temperatures causing spontaneous vaporization of entablature paint

D.Complete blockage of the turbocharger air suction filter creating a high vacuum in the scavenge trunk

Explanation: Scavenge fires occur when flammable residues (unburnt fuel drippings from defective injectors, excessive or drained cylinder lubricating oil, and carbon deposits) collect on the scavenge box floor and are ignited by hot combustion gases or glowing carbon particles blowing past worn, broken, or sticking piston rings (piston blow-by).

5Under what condition does a primary crankcase explosion occur in a marine diesel engine, and what is the function of the crankcase relief valve?

A.Oil mist is ignited by electrostatic discharge at ambient temperatures; relief valves permanently lock open to vent all combustible gases to the engine room

B.Lubricating oil flashes due to high sump oil temperature (> 95°C); relief valves inject high-pressure carbon dioxide into the running crankcase

C.An internal mechanical hot spot (≥ 270°C to 400°C) vaporizes oil that condenses into mist above the LFL (~50 mg/L); relief valves release excess pressure and close immediately to prevent air ingress

D.Exhaust gases pressurize the sump; relief valves allow air into the crankcase to dilute the concentration below the lower explosive limit

Explanation: When an engine component overheats (such as a bearing reaching 270°C–400°C), lubricating oil splashing onto it vaporizes and condenses into a white oil mist of microscopic droplets. When the oil mist concentration reaches the lower explosive limit (approx. 50 mg/L), the hot spot ignites it, causing a primary explosion. The crankcase explosion relief valve features a spring-loaded disc that lifts at 0.1 to 0.2 bar overpressure to relieve the shockwave, backed by an internal wire gauze flame trap to quench flames, and immediately snaps shut to prevent fresh atmospheric air from rushing in, which would trigger a catastrophic secondary explosion.

6Severe cold corrosion in marine two-stroke diesel cylinder liners occurs predominantly under which operational conditions, and how is it mitigated?

A.Excessively high cylinder liner temperatures exceeding 250°C; mitigated by decreasing jacket cooling water inlet temperature to 50°C

B.Low combustion pressures causing moisture condensation in scavenge air; mitigated by injecting fresh water into the fuel homogenizer

C.High engine RPM causing abrasive wear between piston skirts and liners; mitigated by switching to low-viscosity hydraulic oil for cylinder lubrication

D.High combustion pressure combined with liner-wall temperatures below the sulfuric-acid dew point; mitigated by appropriate temperature control and cylinder oil matched to fuel sulfur and operating conditions

Explanation: High combustion pressure can raise the sulfuric-acid dew point. During slow steaming or other low-load operation, liner surfaces may fall below that dew point, allowing sulfur oxides and water vapor to form acid on the liner wall. Mitigation follows the engine maker's guidance for load-dependent cooling and lubrication, including choosing a cylinder-oil Base Number and feed rate appropriate to the fuel sulfur content and verified liner condition.

7A marine propulsion engine develops 12,500 kW brake power at sea. During a 24-hour performance trial, the engine consumes exactly 51.6 metric tonnes of very low sulfur fuel oil (VLSFO). What is the Brake Specific Fuel Consumption (BSFC) of the engine?

A.172.0 g/kWh

B.185.5 g/kWh

C.164.2 g/kWh

D.206.4 g/kWh

Explanation: BSFC is calculated as: BSFC = (Total fuel consumed in grams per hour) / (Brake Power in kW). Total fuel consumed = 51.6 tonnes = 51,600,000 grams. Consumption per hour = 51,600,000 g / 24 hours = 2,150,000 g/h. BSFC = 2,150,000 g/h / 12,500 kW = 172.0 g/kWh.

8While operating at full sea speed in heavy weather, the main engine turbocharger suddenly emits loud popping noises accompanied by severe vibration and fluctuating scavenge air pressure. What phenomenon is occurring, and what is its primary operational cause?

A.Turbine blade stall caused by mechanical collision with loose exhaust valve springs

B.Exhaust gas economizer soot fire forcing hot combustion gases backward through the gas turbine

C.Turbocharger compressor surging, caused by aerodynamic flow separation and backflow across compressor blades when discharge pressure exceeds delivery capacity

D.Scavenge air manifold implosion resulting from severe negative atmospheric pressure

Explanation: Turbocharger surging is an aerodynamic instability occurring when the compressor delivery pressure exceeds the pressure that the compressor impeller can sustain at a given mass flow rate. The airflow suddenly stalls, separates from the impeller blades, and reverses direction, venting back through the air intake with loud panting/banging sounds and intense pressure oscillations. Common causes include abrupt main engine load changes in heavy seas (propeller racing), severe fouling of the air cooler or scavenge ports, or exhaust nozzle ring blockage.

9When measuring cylinder liner wear during a major overhaul, why is the maximum diametral wear almost invariably found at the uppermost limit of top piston ring travel?

A.The piston travels at its highest linear velocity at top dead center, maximizing hydrodynamic frictional abrasion

B.Centrifugal forces acting on the cylinder liner crown are greatest at the top of the stroke

C.Scavenge air entering through the upper ports carries abrasive salt crystals directly across the combustion chamber

D.Maximum combustion pressure behind the ring forces it against the liner, boundary lubrication prevails, and temperatures are highest at TDC

Explanation: Maximum liner wear occurs at the top dead center (TDC) position of the uppermost compression ring because: (1) Gas pressure behind the top piston ring is at its peak (up to 150–200 bar), forcing the ring outward with maximum radial load against the liner wall; (2) Piston speed momentarily slows to zero at TDC, collapsing the hydrodynamic oil film and causing boundary lubrication (metal-to-metal contact); and (3) Temperature is highest, thinning lubricating oil and promoting thermal and corrosive wear.

10What is the consequence of fitting piston rings with insufficient butt (end) clearance during a piston overhaul?

A.Thermal expansion of the ring during engine operation causes ring ends to butt together, leading to ring bowing, liner scoring, and possible piston seizure

B.Excessive gas leakage past the ring gap decreases cylinder compression pressure by more than 50%

C.The piston ring will spin rapidly in its groove, cutting deep helical grooves into the cylinder liner wall

D.The ring will become permanently welded to the bottom of the ring groove by excessive oil carbonization

Explanation: Piston rings expand circumferentially as they heat up during engine operation. If the cold butt clearance is insufficient, the ends will make contact (butt) when thermal expansion occurs. Once the ends meet, further expansion forces the ring outward with extreme radial force against the liner or causes it to buckle out of its groove, stripping the lubricating oil film, severely scoring the liner wall, breaking the ring, and risking full piston seizure.

About the Croatia Chief Engineer Officer Exam

The Croatia Chief Engineer Officer (Upravitelj stroja na brodu sa strojem porivne snage od 3000 kW ili jačim) examination is the statutory qualification administered by the Ministry of the Sea, Transport and Infrastructure (Ministarstvo mora, prometa i infrastrukture — MMPI) and Harbour Master's Offices (Lučke kapetanije) under the Croatian Maritime Code (Pomorski zakonik) and the STCW Convention (Regulation III/2). Prilog C11 assigns written and oral assessment to Maritime English, oral and practical assessment to four engineering subjects, and oral assessment to Maritime Regulations before a five-member state commission. This practice bank is an independent English-language multiple-choice study adaptation designed to reinforce essential marine engineering principles, thermodynamic calculations, auxiliary plant operations, high voltage electrical systems, ERM, and MARPOL/SOLAS compliance; it is not an official translation or an official format simulation.

Exam sponsor: Ministarstvo mora, prometa i infrastrukture (MMPI) and the competent Lučka kapetanija. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

State examination prescribed in Prilog C11 of the Pravilnik o zvanjima i svjedodžbama o osposobljenosti pomoraca (NN 130/13 as amended), covering Maritime English (oral and written), Auxiliary Plants (oral and practical), Electrical Engineering and Automation (oral and practical), Propulsion Machinery (oral and practical), Plant Management and Crew Leadership (oral and practical), and Maritime Regulations (oral). Article 102 permits practical assessment aboard ship, in a specially equipped facility, or on a simulator.

Time Limit

No fixed overall duration is published; confirm session arrangements with the competent Lučka kapetanija

Passing Score

Passing grade ('zadovoljio') in each individual subject and 'položio' overall before the Examination Commission appointed by MMPI

Exam / Certification Fees

Candidates bear examination costs under Article 112; the official sources reviewed do not publish one fixed amount for this examination.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

23% of this practice bank

Marine Propulsion Machinery

Two-stroke crosshead and four-stroke trunk diesel engines, fuel injection systems, common rail, cylinder lubrication, scavenge fires, crankcase relief valves, turbocharging, indicator cards, power calculations, and shafting alignment.

24% of this practice bank

Auxiliary Machinery & Boilers

Auxiliary water-tube and smoke-tube boilers, water treatment chemistry (alkalinity, phosphate, dissolved oxygen, chlorides), steam valves, pumps, air compressors, oily water separators, plate/tubular heat exchangers, centrifugal purifiers, and steering gear.

20% of this practice bank

Electrical Engineering & Automation

Marine alternators, AVR control, active and reactive power sharing, synchronization methods, vacuum circuit breakers, high voltage safety (1 kV - 11 kV), insulation testing, emergency switchboard logic, PLCs, sensors, and PID governors.

14% of this practice bank

Engine Room Management & Leadership

Engine room resource management (ERM), communications, situational awareness, fatigue management, planned maintenance systems (PMS), spare parts inventory, bunkering checklists, permit-to-work systems, and enclosed space rescue.

14% of this practice bank

Maritime Regulations & Environmental Protection

MARPOL Annex I oil discharge monitoring and oil record book part I, Annex VI air pollution (EEXI, CII, scrubbers, low sulfur fuels), Annex IV sewage, Ballast Water Management Convention (D-2 performance standard), SOLAS machinery requirements, and MLC 2006.

5% of this practice bank

Maritime English

Clear engine-room handovers, defect reports, machinery terminology, closed-loop orders, and technical correspondence. These allocations are editorial practice-bank shares, not official examination weights.

Preparing for the Croatia Chief Engineer Officer Exam

What You Need to Know

Passing score: Passing grade ('zadovoljio') in each individual subject and 'položio' overall before the Examination Commission appointed by MMPI
Assessment: State examination prescribed in Prilog C11 of the Pravilnik o zvanjima i svjedodžbama o osposobljenosti pomoraca (NN 130/13 as amended), covering Maritime English (oral and written), Auxiliary Plants (oral and practical), Electrical Engineering and Automation (oral and practical), Propulsion Machinery (oral and practical), Plant Management and Crew Leadership (oral and practical), and Maritime Regulations (oral). Article 102 permits practical assessment aboard ship, in a specially equipped facility, or on a simulator.
Time limit: No fixed overall duration is published; confirm session arrangements with the competent Lučka kapetanija
Exam / certification fees: Candidates bear examination costs under Article 112; the official sources reviewed do not publish one fixed amount for this examination. Official sources

Using Our Practice Resources

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

Croatia Chief Engineer Officer: Suggested Study Strategy

1Practice indicator card and marine diesel calculations: solve for indicated mean effective pressure, indicated power, brake power, mechanical efficiency, and specific fuel consumption.

2Study boiler-water testing and treatment principles, then use the boiler maker's and treatment supplier's instructions for vessel-specific alkalinity, phosphate, oxygen-scavenger, and chloride limits.

3Review high-voltage safety procedures: understand earthing truck operations, permit-to-work requirements, dielectric breakdown testing, and key interlock systems on 6.6 kV and 11 kV switchboards.

4Memorize MARPOL Annex I discharge criteria: know the 15 ppm limit, oil filtering equipment operation, automatic stopping device requirements, and exact 15 ppm alarm calibration standards.

5Review SOLAS steering-gear performance requirements and practise the vessel-specific changeover, local-control, communications, and emergency-steering drill procedure.

6Understand fuel oil purification: master gravity disc diameter selection based on fuel density, viscosity, and separation temperature to prevent oil loss from water outlets.

Frequently Asked Questions

What is the Croatia Chief Engineer Officer (Upravitelj stroja od 3000 kW) qualification?

It is the statutory certificate of competency issued by the Republic of Croatia under the Maritime Code (Pomorski zakonik) and STCW Regulation III/2 for service as Chief Engineer Officer (Upravitelj stroja) on ships powered by main propulsion machinery of 3,000 kW or more.

Who administers the Chief Engineer examination in Croatia?

The examination is conducted by state examination commissions appointed by the Ministry of the Sea, Transport and Infrastructure (MMPI), through the competent Harbour Master's Office (Lučka kapetanija).

What is the official format of the Croatian Chief Engineer examination?

Prilog C11 assigns oral and written assessment to Maritime English, oral and practical assessment to four engineering subjects, and oral assessment to Maritime Regulations. Article 102 permits practical assessment aboard ship, in a specially equipped facility, or on a simulator. The commission has five members.

In what language is the official Croatian examination conducted?

Prilog C11 expressly makes Maritime English an oral and written subject. The public Ordinance reviewed does not state a general delivery-language rule for the other subjects, so candidates should confirm those arrangements with the competent Harbour Master's Office.

How does this practice bank relate to the official examination?

This bank is an independent English-language multiple-choice study adaptation developed by OpenExamPrep. It is designed to reinforce essential thermodynamic calculations, machinery troubleshooting, electrical principles, and regulatory compliance; it is not an official translation or an official format simulation.