100+ Free BD Marine Engineer Class 4 (Coastal CE) Practice Questions

Prepare for the Bangladesh DoS Marine Engineer Officer Class 4 (Chief Engineer Officer - Coastal Voyage) Certificate of Competency exam with instant access — no signup required.

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Sample BD Marine Engineer Class 4 (Coastal CE) Practice Questions

Try these sample questions to test your BD Marine Engineer Class 4 (Coastal CE) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is a feeler gauge used for in engine room workshop practice?

A.Measuring electrical voltage across a circuit

B.Measuring small clearances or gaps between two surfaces

C.Measuring the temperature of a bearing

D.Measuring the specific gravity of battery electrolyte

Explanation: A feeler gauge is a set of thin metal blades of graduated thickness used to measure small clearances, such as piston ring side clearance, valve tappet clearance, or bearing running clearance. The correct blade is selected until it just fits snugly in the gap.

2Which tool is used to accurately measure the outside diameter of a shaft to within a hundredth of a millimetre?

A.Feeler gauge

B.Vernier caliper only

C.Micrometer screw gauge

D.Steel rule

Explanation: A micrometer screw gauge gives precise external (or internal/depth) measurements, typically to 0.01 mm, using a calibrated screw thread. It is the standard workshop instrument for checking shaft diameters, wear limits, and bearing clearances with high accuracy.

3What does the Total Base Number (TBN) of a diesel engine's lubricating oil indicate?

A.The oil's resistance to foaming at high temperature

B.The oil's ability to neutralise acidic combustion by-products

C.The oil's viscosity at operating temperature

D.The oil's flash point

Explanation: TBN measures the reserve alkalinity in lubricating oil, which neutralises acidic products formed from combustion (especially with high-sulphur fuel) before they can corrode cylinder liners, piston rings, and bearings. A falling TBN during oil analysis warns that the oil's acid-neutralising capacity is being used up.

4What condition is most likely to cause cavitation damage in a centrifugal pump?

A.Excessive suction pressure on the pump inlet

B.Insufficient suction head causing local vaporisation of the liquid

C.Running the pump at too low a speed

D.Using an oversized discharge pipe

Explanation: Cavitation occurs when the pressure at the pump's suction eye drops below the liquid's vapour pressure, causing vapour bubbles to form and then collapse violently as they reach the higher-pressure discharge side. This is usually caused by insufficient suction head, a blocked strainer, or excessive suction lift, and the collapsing bubbles erode impeller and casing surfaces.

5What is the main function of a stuffing box fitted around a propeller shaft where it passes through the stern tube?

A.To lubricate the propeller blades

B.To prevent seawater from entering the vessel along the rotating shaft

C.To reduce the shaft's rotational speed

D.To measure the shaft's torque

Explanation: The stuffing box (shaft seal) around the stern tube uses packing or mechanical seals to prevent seawater from leaking into the engine room along the rotating propeller shaft, while still allowing the shaft to turn freely. It is checked regularly for gland leakage and packing wear.

6How does a sacrificial zinc anode protect a ship's hull and sea water piping from corrosion?

A.It coats the metal surface with a protective paint film

B.It absorbs vibration that would otherwise crack the metal

C.It corrodes preferentially because it is more electrochemically active than the surrounding metal

D.It increases the water temperature to reduce rust formation

Explanation: Sacrificial anodes such as zinc or aluminium are more anodic (electrochemically active) than steel. When connected in the same electrolyte, the anode corrodes preferentially, supplying electrons that protect the more valuable steel hull or piping from galvanic corrosion. Anodes must be inspected and replaced as they waste away.

7Why is a bilge high-level alarm fitted in the engine room?

A.To warn of excessive fuel oil viscosity

B.To warn the watchkeeper of a rising water level that could indicate flooding or a leak

C.To indicate when the main engine has overheated

D.To signal when the anchor is dragging

Explanation: A bilge high-level alarm alerts the engineer on watch that water is accumulating faster than normal in the bilge well, which may indicate a pipe leak, gland leakage, or hull ingress. Early warning allows the crew to investigate and pump out the bilge before the situation becomes dangerous.

8Which of the following best describes a key difference between ferrous and non-ferrous metals used in engine room components?

A.Ferrous metals always melt at a lower temperature than non-ferrous metals

B.Ferrous metals contain iron and are generally magnetic, while non-ferrous metals do not contain iron and are generally non-magnetic

C.Non-ferrous metals cannot be welded under any circumstances

D.Ferrous metals are always lighter than non-ferrous metals

Explanation: Ferrous metals (such as cast iron and steel used for cylinder liners and engine blocks) contain iron and are generally magnetic, while non-ferrous metals (such as copper, brass, and bronze used for pipework and bearings) contain no iron and are generally non-magnetic. This distinction affects corrosion resistance, strength, and suitability for different engine components.

9Why must a torque wrench be used when tightening cylinder head or bearing cap bolts?

A.To measure the temperature of the bolt during tightening

B.To apply a specified, even tightening force so that gaskets seal properly and bolts are not over- or under-stressed

C.To count the number of threads on the bolt

D.To electrically insulate the joint

Explanation: A torque wrench applies a precisely controlled rotational force to a fastener, ensuring bolts are tightened to the manufacturer's specified value. This prevents under-tightening (which can cause leaks or loosening from vibration) and over-tightening (which can stretch or shear the bolt and damage the gasket or joint face).

10What is the primary purpose of a gasket fitted between two mating flanges or covers?

A.To increase the electrical conductivity between the two parts

B.To provide a compressible seal that fills surface irregularities and prevents fluid or gas leakage

C.To reduce the weight of the assembly

D.To act as a bearing surface for a rotating shaft

Explanation: A gasket is a compressible material placed between two mating surfaces to fill microscopic irregularities and maintain a leak-tight seal against the fluid or gas pressure inside, even though the two surfaces are not perfectly flat or smooth. Gasket material is chosen based on the fluid, temperature, and pressure involved.

About the BD Marine Engineer Class 4 (Coastal CE) Exam

The Bangladesh DoS Marine Engineer Officer Class-4 Certificate of Competency qualifies a seafarer to serve as Chief Engineer Officer on a coastal or near-coastal voyage ship with main propulsion machinery of less than 3000 kW. Per the 2020 regulations (section 13(5)), eligible candidates typically must already hold the Class-5 (Engineer Officer — Coastal Voyage) COC and have at least 12 months of approved sea service as officer in charge of an engineering watch on qualifying coastal vessels — the ~36-month sea-service routes with Navy/Coast Guard or fishing-vessel alternates apply to Class-5, not directly to Class-4. The certificate is awarded following an oral examination administered by the DoS COC Section.

Assessment

Certificate of Competency assessment under the Bangladesh Merchant Shipping Officers and Ratings Training, Certification, Recruitment, Work Hours and Watchkeeping Regulations (as amended), qualifying the holder to serve as Chief Engineer Officer in charge of a manned engine room, or as designated duty engineer officer in a periodically unmanned engine room, on a seagoing ship with main propulsion machinery of less than 3000 kW engaged on coastal or near-coastal voyages. This is the coastal chief-engineer grade (Class-4), not the coastal engineer-officer/watchkeeping grade (Class-5). The Class-4 (Engine) examination is assessed by oral examination only. Per the 2020 regulations (section 13(5)), candidates must typically already hold the Class-5 coastal engineer-officer COC, complete at least 12 months as officer in charge of an engineering watch on qualifying coastal vessels, and hold the required STCW certificates including PSCRB, Advanced Fire Fighting, Medical First Aid, and Ship Security Officer training — confirm the current ERP portal checklist before applying.

Time Limit

DoS has not published a fixed time limit for the Class-4 (Engine) oral examination. Confirm session arrangements with DoS or your maritime training institute.

Passing Score

Per the Bangladesh Merchant Shipping Officers and Ratings Training, Certification, Recruitment, Work Hours and Watchkeeping (Amendment) Regulations 2020, the Class-4 (Chief Engineer Officer - Coastal Voyage) examination is oral only, with a minimum pass mark of 70%.

Exam Fee

DoS charges separate government fees for the assessment application, oral examination application, and certificate issuance, all paid online via the DoS ERP portal; these fees are set by the government and change periodically. Confirm the current fee schedule on the DoS ERP portal before applying. (Department of Shipping (DoS), Bangladesh, Ministry of Shipping)

BD Marine Engineer Class 4 (Coastal CE) Exam Content Outline

16%

Engineering Knowledge (General)

Workshop tools and measurement, materials and metals, bearings, corrosion control, gaskets and fasteners, and general engine room safety practice.

18%

Engineering Knowledge (Motor/Diesel Engines)

Two-stroke and four-stroke cycles, turbocharging, fuel injection, combustion faults, cylinder liners, piston rings, camshafts, governors, crankcase safety, and cooling water treatment.

10%

Naval Architecture and Ship Construction

Metacentric height, freeboard, trim, list and heel, double bottom tanks, load line marks, bulkheads, free surface effect, displacement and deadweight, and bilge keels.

Machine Drawing and Engineering Components

Orthographic projection, sectional views, fits and tolerances, drawing line conventions, hatching, and basic welding symbols.

Applied Mechanics

Moments and levers, work and power, stress and strain, Young's Modulus, and factor of safety for lifting gear.

Applied Heat and Thermodynamics

The first law of thermodynamics, heat transfer modes, specific heat and latent heat, boiler safety valves, the refrigeration cycle, exhaust gas economisers, and jacket cooling water pressurisation.

10%

Electro-technology

Ohm's Law, AC and DC generators, earth fault indication on insulated distribution systems, circuit breakers, insulation resistance testing, batteries, rectifiers, AVRs, and switchboard bus-bars.

Auxiliary Machinery, Pumps and Piping

Centrifugal and reciprocating pump priming, purifiers, oily water separators, starting air systems, sea chests and sea valves, non-return valves, and cooling water expansion tanks.

Engine Room Management and Statutory Duties

Chief engineer's responsibilities, Engine Room Resource Management, the Oil Record Book, the ISM Code Safety Management System, planned maintenance, watch handover, enclosed space entry, and classification society surveys.

Safety, Firefighting and Emergency Procedures

The fire triangle and fire classes, fixed CO2 systems, emergency generators, fire response procedures, quick-closing fuel valves, SOPEP, and engine room PPE.

How to Pass the BD Marine Engineer Class 4 (Coastal CE) Exam

What You Need to Know

Passing score: Per the Bangladesh Merchant Shipping Officers and Ratings Training, Certification, Recruitment, Work Hours and Watchkeeping (Amendment) Regulations 2020, the Class-4 (Chief Engineer Officer - Coastal Voyage) examination is oral only, with a minimum pass mark of 70%.
Assessment: Certificate of Competency assessment under the Bangladesh Merchant Shipping Officers and Ratings Training, Certification, Recruitment, Work Hours and Watchkeeping Regulations (as amended), qualifying the holder to serve as Chief Engineer Officer in charge of a manned engine room, or as designated duty engineer officer in a periodically unmanned engine room, on a seagoing ship with main propulsion machinery of less than 3000 kW engaged on coastal or near-coastal voyages. This is the coastal chief-engineer grade (Class-4), not the coastal engineer-officer/watchkeeping grade (Class-5). The Class-4 (Engine) examination is assessed by oral examination only. Per the 2020 regulations (section 13(5)), candidates must typically already hold the Class-5 coastal engineer-officer COC, complete at least 12 months as officer in charge of an engineering watch on qualifying coastal vessels, and hold the required STCW certificates including PSCRB, Advanced Fire Fighting, Medical First Aid, and Ship Security Officer training — confirm the current ERP portal checklist before applying.
Time limit: DoS has not published a fixed time limit for the Class-4 (Engine) oral examination. Confirm session arrangements with DoS or your maritime training institute.
Exam fee: DoS charges separate government fees for the assessment application, oral examination application, and certificate issuance, all paid online via the DoS ERP portal; these fees are set by the government and change periodically. Confirm the current fee schedule on the DoS ERP portal before applying.

Keys to Passing

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

BD Marine Engineer Class 4 (Coastal CE) Study Tips from Top Performers

1Since the Class-4 exam is oral, practise explaining concepts out loud in your own words rather than only reading silently - an examiner will expect you to describe how a system works and why, not just pick a multiple-choice answer.

2Build up from engine fundamentals (two-stroke vs four-stroke, fuel injection, cooling and lubrication) before moving to auxiliary machinery and electrical systems, since oral examiners commonly probe a fault scenario (for example, black smoke or a tripped generator) and expect you to reason through causes step by step.

3Pair each theory topic with the equivalent hands-on task on your own vessel or training ship, such as taking a crankshaft deflection reading, checking battery specific gravity, or testing insulation resistance with a megger, since a coastal chief engineer is expected to demonstrate practical competence, not just recall definitions.

4Revise your engine room safety and statutory duties thoroughly, including watch handover, enclosed space entry, and the Oil Record Book, since as the senior engineer on a coastal vessel you are expected to know these management responsibilities cold, not just the technical machinery topics.

Frequently Asked Questions

Who awards the Marine Engineer Class-4 Certificate of Competency and what does it qualify you to do?

The Department of Shipping (DoS), Bangladesh, under the Ministry of Shipping, awards the Class-4 (Engine) Certificate of Competency, which qualifies the holder to serve as Chief Engineer Officer of a manned engine room, or as designated duty engineer officer in a periodically unmanned engine room, on a coastal or near-coastal voyage ship with main propulsion machinery of less than 3000 kW.

Is the Class-4 (Engine) examination written or oral?

Per the Bangladesh Merchant Shipping Officers and Ratings Training, Certification, Recruitment, Work Hours and Watchkeeping (Amendment) Regulations 2020, the Marine Engineer Officer Class-4 (Chief Engineer Officer - Coastal Voyage) Certificate Examination is oral only, with a minimum pass mark of 70%. There are no separate written subject papers for this grade, unlike Class-3 and Class-5, which include written papers.

How many questions are in this practice bank and what topics does it cover?

This free bank has 100 multiple-choice questions covering engineering knowledge (general and motor/diesel engines), naval architecture and ship construction, machine drawing, applied mechanics, applied heat and thermodynamics, electro-technology, auxiliary machinery and pumps, engine room management, and safety and firefighting - the underlying knowledge areas an oral examiner would probe for a coastal chief engineer candidate.

What sea service is needed to sit the Class-4 (Engine) examination?

Per the 2020 regulations (section 13(5)), Class-4 (Chief Engineer Officer — Coastal Voyage) candidates typically must already hold the Class-5 coastal engineer-officer COC and have at least 12 months of approved sea service as officer in charge of an engineering watch on ships under 3000 kW on coastal or near-coastal voyages. The ~36-month sea-service requirement (with six months supervised watchkeeping and alternate Navy/Coast Guard or fishing-vessel routes) applies to the Class-5 examination, not Class-4 directly. Confirm your exact route with DoS.

What certificates of proficiency are needed alongside the oral exam for a Class-4 (Engine) COC?

Per the 2020 regulations (section 13(5)(c)), candidates must hold documentary evidence of Basic Training (STCW A-VI/1), Proficiency in Survival Craft and Rescue Boats (A-VI/2-1), Advanced Fire Fighting (A-VI/3), Medical First Aid (A-VI/4-1), and Ship Security Officer (A-VI/5), plus medical fitness. The DoS ERP COC Manual (Engine) lists a shorter basic-STCW set for online Class-4 application — confirm the current portal checklist before applying.