Free Practice Questions for Sjöingenjör

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Sample Sjöingenjör Practice Questions

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

1Why do large two-stroke crosshead engines have a piston rod stuffing box (diaphragm) between the scavenge space and the crankcase?

A.So the piston can rotate in the liner to even out wear

B.To keep scavenge residues out of the crankcase oil

C.So no exhaust valve is needed in the cylinder cover

D.To take the side thrust instead of the crosshead guides

Explanation: The crosshead and guides take the connecting rod's side thrust, so the piston rod moves straight up and down through the stuffing box. Its scraper and sealing rings stop drained cylinder oil, combustion residues and acids from reaching the crankcase oil.

2An out-of-phase (draw) card shows the pressure rise delayed past TDC, a low peak pressure and a high exhaust temperature for that unit. What is the likely cause?

A.Early injection, giving hard combustion and knocking

B.A cracked liner letting cooling water onto the piston

C.A fouled turbocharger giving too much charge air

D.Late injection; burning continues into expansion

Explanation: With late injection, combustion starts after TDC and the peak pressure stays low. More fuel burns during expansion, so less work is done and more heat leaves with the exhaust.

3A six-cylinder two-stroke engine has a bore area of 0.2827 m² and a stroke of 2.0 m. At 100 rpm the mean indicated pressure is 18.0 bar. Using P = pmi × L × A × n per cylinder, what is the total indicated power?

A.About 10,177 kW

B.About 5,089 kW

C.About 1,696 kW

D.About 20,354 kW

Explanation: For a two-stroke, n is revolutions per second: 100 ÷ 60 = 1.667. Per cylinder P = 1.8 × 10⁶ Pa × 2.0 m × 0.2827 m² × 1.667 s⁻¹ ≈ 1,696 kW, and six cylinders give about 10,177 kW.

4What is the main operational advantage of an electronically controlled (camshaftless) two-stroke engine over a camshaft engine?

A.It needs no turbocharger or charge air cooler

B.It can burn only distillate fuels, which are cleaner

C.Free injection and valve timing at any load

D.It has no crankshaft and drives a generator directly

Explanation: A hydraulic power supply and electronically controlled valves replace the camshaft, so injection timing, injection profile and exhaust valve timing can be optimised for each load, including low-load and emission modes.

5On a low-pressure dual-fuel engine running on gas (Otto cycle), what is methane slip and why does it matter?

A.Gas leaking from the double-walled pipes into the engine room

B.Unburned gas slipping into the exhaust

C.Methane absorbed into the cylinder lubricating oil

D.Boil-off gas lost from the LNG fuel tank vent

Explanation: Some premixed gas escapes combustion, for example from crevices around the piston or during scavenging, and leaves with the exhaust. Methane's global warming effect over 100 years is many times that of CO2, so slip reduces the climate benefit of LNG.

6How does a high-pressure gas injection two-stroke engine (Diesel cycle) differ from a low-pressure Otto-cycle gas engine?

A.Gas is premixed with scavenge air at low pressure

B.Spark plugs ignite the gas in each cylinder

C.Gas is burned only at low load, with oil at sea speed

D.High-pressure gas into a pilot flame near TDC

Explanation: Pilot oil ignites first, and gas is injected at high pressure near TDC into the flame, as in a diesel engine. Because there is no premixed charge, knocking is avoided and methane slip is very low.

7What usually causes a scavenge space fire in a two-stroke crosshead engine?

A.Oily carbon in the scavenge space lit by blow-by

B.Using low-sulphur gas oil instead of residual fuel

C.An overheated charge air cooler circulating pump

D.Stray current through the shaft earthing device

Explanation: Excess cylinder oil and carbon collect in the scavenge space. Hot gas blowing past worn, broken or sticking piston rings ignites them. Regular cleaning and draining and good ring condition prevent it.

8A scavenge fire is found while the engine is running. What are the correct first actions?

A.Stop cylinder lubrication and drain the crankcase sump

B.Increase engine speed to blow the fire out quickly

C.Slow down, cut its fuel, raise its cylinder oil

D.Open the scavenge doors at once and attack with hoses

Explanation: Reduce speed, cut fuel to the affected unit and increase its cylinder lubrication to protect the piston. Keep scavenge doors closed. If the fire spreads, stop the engine and use the fixed extinguishing system; open doors only after cooling.

9How do primary and secondary crankcase explosions develop?

A.Water in the oil splits into hydrogen and oxygen

B.Hot-spot oil mist ignites; inrushing air re-ignites it

C.Exhaust gas leaks back into the crankcase and ignites

D.Air in the crankcase is compressed until it self-ignites

Explanation: A hot spot, such as a failing bearing, vaporises oil, which condenses into a fine mist. When the mist reaches a flammable concentration the hot spot ignites it. The blast and cooling create a partial vacuum that draws in air, which can cause a more violent secondary explosion.

10How do crankcase explosion relief valves, required by SOLAS II-1/27 on larger engines, protect people and the engine?

A.They spray water onto the crankshaft to cool it

B.They lock the crankcase doors so they cannot blow off

C.They inject inert gas when oil mist is detected

D.Vent via a flame trap at low pressure, then reclose

Explanation: SOLAS II-1/27 requires relief valves on engines with a bore of 200 mm or more or a crankcase volume of 0.6 m³ or more. They open quickly at a small overpressure, pass the gases through a flame arrester so no flames escape, and close immediately so air cannot rush in and cause a secondary explosion.

About the Sjöingenjör Exam

Sjöingenjör is Sweden's highest engineer certificate, giving the right to serve in every engineer officer position on all Swedish merchant ships, at any propulsion power and in every trading area. It requires the sjöingenjörsexamen, a professional degree from Chalmers or Linnaeus University trained to STCW Code section A-III/2, followed by 36 months of engineer officer service with stated power, trading-area and förste fartygsingenjör requirements. This independent bank is an English-language MCQ study adaptation, not an official translation or assessment.

Exam sponsor: Transportstyrelsen (certificates); Chalmers and Linnaeus University (degree). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Four-year programme at Chalmers or Linnaeus University leading to the sjöingenjörsexamen (180 credits). With ten months of sea training plus electrical and workshop practice it leads first to Maskinbefäl klass V; the Sjöingenjör certificate follows after 36 months of engineer officer service. Training meets STCW Code section A-III/2.

Time Limit

Varies by course exam

Passing Score

Pass in every course of the degree; no single national pass mark

Exam / Certification Fees

No separate exam fee; SEK 1,000 per certificate application

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.

20%

Marine diesel and propulsion plants

Two- and four-stroke diesels, indicator cards, power calculations, dual-fuel engines, fires and explosions, turbochargers and vibration.

20%

Marine electrical power and automation

High voltage, insulated systems, paralleling, protection, emergency power, motor starting, sensors and safety systems.

15%

Steam turbines, boilers, and thermodynamics

Boilers, water treatment, blowdown, safety valves, superheating, turbines, condensers and deaeration.

15%

Auxiliary machinery and refrigeration

Purifiers, bilge separators, freshwater generation, refrigeration, steering gear, compressors, pumps and coolers.

15%

Naval architecture and damage control

Dry-docking, stern tube and rudder checks, limiting KG, flooding, DP classes, cathodic protection and coatings.

15%

Maritime regulations, safety, and environmental protection

MARPOL Annex VI, scrubbers, record books, SOLAS fire safety, ISM maintenance, class surveys, noise and towing.

Preparing for the Sjöingenjör Exam

What You Need to Know

Passing score: Pass in every course of the degree; no single national pass mark
Assessment: Four-year programme at Chalmers or Linnaeus University leading to the sjöingenjörsexamen (180 credits). With ten months of sea training plus electrical and workshop practice it leads first to Maskinbefäl klass V; the Sjöingenjör certificate follows after 36 months of engineer officer service. Training meets STCW Code section A-III/2.
Time limit: Varies by course exam
Exam / certification fees: No separate exam fee; SEK 1,000 per certificate application Official sources

Using Our Practice Resources

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Sjöingenjör: Suggested Study Strategy

1Work engine power from first principles: indicated power = mean indicated pressure × stroke × bore area × firing strokes per second × cylinders.

2Read indicator cards by shape: late injection, early injection and leaking valves each leave a distinct pattern.

3Know generator paralleling cold: synchroscope direction, governor versus AVR roles, reverse power and preferential tripping.

4Learn the SOLAS figures engineers are tested on: emergency generator start and duration, steering gear timing and fire pump location.

5Keep MARPOL Annex VI current: Tier III NOx in the Baltic and North Sea NECAs, open- and closed-loop scrubbers, EEXI power limits and HCFC rules.

Frequently Asked Questions

What does the Sjöingenjör certificate allow?

Transportstyrelsen describes Sjöingenjör as the highest engineer certificate, giving the right to serve in every engineer officer position on all Swedish merchant ships, at any propulsion power and in every trading area.

How do you qualify for Sjöingenjör?

Complete the sjöingenjörsexamen at Chalmers or Linnaeus University, which leads first to Maskinbefäl klass V. Then serve at least 36 months as an engineer officer on ships of 750 kW or more, including 18 months beyond Öresund-only near-coastal trade, of which 12 months as förste fartygsingenjör on ships of 3,000 kW or more. You must be at least 20.

Is there one national Sjöingenjör exam?

No. Knowledge is assessed through the courses of the degree, including written exams, laboratory work, simulator exercises and onboard training. Transportstyrelsen then checks the degree and sea service before issuing the certificate.

Is this practice bank official?

No. It is independent practice by OpenExamPrep. Chalmers lists Swedish and English as the languages of instruction and examination; this bank is an English-language MCQ study adaptation, not an official translation or a simulation of the university assessments.