I85PREP
⌘ K
Registered Ship Surveyor study materials
Registered Ship Surveyor study resources

Registered Ship Surveyor practice questions

One question at a time. Build your Registered Ship Surveyor understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1International maritime conventions and national regulations

Under SOLAS, which document confirms that a ship and its equipment comply with the convention's requirements and that the ship is fit to proceed to sea without danger to the ship or persons on board?

  1. The Document of Compliance issued under the ISM Code
  2. The International Tonnage Certificate
  3. The Cargo Ship Safety Construction Certificate Correct answer.
  4. The Continuous Synopsis Record

Explanation

SOLAS certificates such as the Cargo Ship Safety Construction Certificate are issued after survey and certify that the ship and its equipment meet the applicable chapter requirements and are fit to proceed to sea without danger to the ship or persons on board. The other documents serve different purposes: ISM compliance, tonnage measurement, and ship history respectively.

Question 2International maritime conventions and national regulations

A new oil tanker of 150,000 tonnes deadweight is being delivered. Under MARPOL Annex I, which requirement applies to its cargo tank protection?

  1. It must be fitted with double hull or an approved alternative arrangement meeting the regulations Correct answer.
  2. It must be fitted with a single hull with high-tensile steel only
  3. It must be fitted with segregated ballast tanks only
  4. It must be fitted with a crude oil washing system only

Explanation

MARPOL Annex I Regulation 19 requires new oil tankers above certain deadweight thresholds to have double hulls, or an approved alternative arrangement that gives equivalent protection against oil pollution in the event of collision or stranding. Segregated ballast and crude oil washing are operational measures, not substitutes for the structural requirement.

Question 3International maritime conventions and national regulations

A surveyor is checking whether a ship's International Oil Pollution Prevention Certificate remains valid. Which event invalidates the certificate without any action by the Administration?

  1. A change of the ship's name
  2. A change of the ship's owner or manager
  3. A substantial alteration to the ship's structure or equipment covered by the certificate Correct answer.
  4. A change of the ship's classification society

Explanation

Under MARPOL, a certificate ceases to be valid when substantial alterations are made to the ship's structure, equipment, systems, fittings or arrangements covered by the certificate, unless the certificate is reissued or amended after survey. Changes of name, ownership or class do not by themselves invalidate the pollution prevention certificate.

Question 4International maritime conventions and national regulations

What is the purpose of the International Safety Management Code as adopted by IMO?

  1. To provide an international standard for the safe management and operation of ships and for pollution prevention Correct answer.
  2. To set minimum training standards for seafarers
  3. To establish structural requirements for hull strength
  4. To regulate the carriage of dangerous goods in packaged form

Explanation

The ISM Code requires companies to establish a safety management system covering safety and environmental protection policies, defined responsibilities, and procedures for key shipboard operations. It is a management standard, not a structural, training or cargo-carriage standard.

Question 5International maritime conventions and national regulations

Under the STCW Convention, which document must a seafarer hold to serve in a capacity for which certification is required?

  1. A passport issued by the flag State
  2. A certificate of competency or certificate of proficiency issued or recognised by the Administration Correct answer.
  3. A ship's articles of agreement
  4. A medical fitness certificate only

Explanation

STCW requires seafarers to hold certificates of competency or proficiency issued or recognised by the flag State Administration for the capacity in which they serve. The other documents may be required for employment but do not certify competence.

Question 6International maritime conventions and national regulations

A vessel of 40,000 gross tonnage is engaged on an international voyage. Under SOLAS Chapter IX, which requirement applies?

  1. The ship must be fitted with a double bottom
  2. The company and the ship must comply with the ISM Code and hold a Document of Compliance and Safety Management Certificate Correct answer.
  3. The ship must carry a Ship Security Officer
  4. The ship must carry a minimum of two GMDSS operators

Explanation

SOLAS Chapter IX makes the ISM Code mandatory for passenger ships, oil and chemical tankers, bulk carriers, gas carriers and cargo high-speed craft of 500 gross tonnage and above, and other cargo ships and mobile offshore units of 500 gross tonnage and above on international voyages. Compliance is evidenced by the company's Document of Compliance and the ship's Safety Management Certificate.

Question 7International maritime conventions and national regulations

What does the Load Line Convention primarily establish?

  1. Minimum freeboard and load line markings to ensure adequate reserve buoyancy and structural strength Correct answer.
  2. Minimum crew numbers for each ship type
  3. Maximum speed limits in coastal waters
  4. Maximum cargo weight per container

Explanation

The International Convention on Load Lines sets minimum freeboards for ships assigned load lines, taking into account structural strength, reserve buoyancy and protection of openings. The assigned load lines are marked on the ship's sides and recorded in the Load Line Certificate.

Question 8International maritime conventions and national regulations

A ship's International Load Line Certificate is about to expire. Under the Load Line Convention, what is the maximum period for which a certificate may normally be issued?

  1. Five years Correct answer.
  2. Ten years
  3. Three years
  4. Two years

Explanation

Under the Load Line Convention, an International Load Line Certificate is issued for a period not exceeding five years. Periodic surveys and annual surveys are required to maintain its validity.

Question 9International maritime conventions and national regulations

Under the International Convention for the Prevention of Pollution from Ships, what does Annex VI address?

  1. Air pollution from ships Correct answer.
  2. Sewage from ships
  3. Garbage from ships
  4. Noxious liquid substances in bulk

Explanation

MARPOL Annex VI regulates air pollution from ships, including emissions of ozone-depleting substances, nitrogen oxides, sulphur oxides, volatile organic compounds, and shipboard incineration, as well as energy efficiency requirements. Sewage, garbage and noxious liquid substances are addressed in Annexes IV, V and II respectively.

Question 10International maritime conventions and national regulations

A surveyor is verifying compliance with the Ballast Water Management Convention for a new ship. Which requirement applies at delivery?

  1. The ship must carry a sewage treatment plant
  2. The ship must have a garbage management plan
  3. The ship must have an approved Ballast Water Management Plan and a valid International Ballast Water Management Certificate Correct answer.
  4. The ship must conduct ballast water exchange only

Explanation

The BWM Convention requires ships to have an approved Ballast Water Management Plan, a Ballast Water Record Book, and to be surveyed and certificated with an International Ballast Water Management Certificate. New ships must meet the D-2 discharge standard through an approved ballast water management system.

Question 11International maritime conventions and national regulations

Under SOLAS Chapter XI-2 and the ISPS Code, which document is issued to a ship that complies with the applicable security requirements?

  1. The International Ship Security Certificate Correct answer.
  2. The Ship Security Plan
  3. The Safety Management Certificate
  4. The Document of Compliance

Explanation

The International Ship Security Certificate is issued after verification that the ship complies with SOLAS Chapter XI-2 and the ISPS Code, including having an approved Ship Security Plan. The Ship Security Plan itself is a plan, not a certificate, and the Safety Management Certificate and Document of Compliance relate to the ISM Code.

Question 12International maritime conventions and national regulations

What is the function of the Continuous Synopsis Record?

  1. To provide an on-board record of the history of the ship, including flag, owner and classification society Correct answer.
  2. To record the ship's cargo history
  3. To certify the ship's tonnage
  4. To certify the crew's qualifications

Explanation

The Continuous Synopsis Record is a document, required by SOLAS Chapter XI-1, that records the history of the ship, including the flag State, date of registration, name of the ship, registered owner, bareboat charterer, classification society and other identifying details. It is not a certificate of tonnage, cargo record or crew qualification.

Question 13International maritime conventions and national regulations

A surveyor finds that a ship's International Oil Pollution Prevention Certificate is valid but the ship has been transferred to another flag State. What is the appropriate action?

  1. The certificate remains valid indefinitely under the new flag
  2. The certificate must be surrendered and no certificate is needed until the next dry-docking
  3. The old certificate must be retained until its expiry date without any action
  4. The new Administration must issue a new certificate after survey or authorise a new one on the basis of the existing certificate Correct answer.

Explanation

When a ship is transferred to the flag of another State, the new Administration is responsible for issuing a new certificate after survey, or may authorise a new certificate based on the existing one, in accordance with MARPOL procedures. The old certificate cannot simply continue in force under the new flag.

Question 14International maritime conventions and national regulations

Under MARPOL Annex V, which of the following discharges of garbage is permitted outside special areas, subject to distance from land requirements?

  1. Discharge of food waste comminuted to a specified size Correct answer.
  2. Discharge of cooking oil
  3. Discharge of incinerator ash
  4. Discharge of plastics

Explanation

MARPOL Annex V permits the discharge of comminuted food waste outside special areas, provided it is passed through a comminuter or grinder with a specified mesh size and discharged at the required minimum distance from the nearest land. Plastics, cooking oil and incinerator ash are prohibited from discharge.

Question 15International maritime conventions and national regulations

Which convention sets out the international regulations for preventing collisions at sea?

  1. COLREG Correct answer.
  2. SOLAS
  3. MARPOL
  4. LLMC

Explanation

The Convention on the International Regulations for Preventing Collisions at Sea, known as COLREG, sets out the steering and sailing rules, lights, shapes and sound signals. SOLAS addresses ship construction and safety equipment, MARPOL addresses pollution, and LLMC addresses limitation of liability.

Question 16International maritime conventions and national regulations

A surveyor is reviewing a ship's compliance with the International Convention on Standards of Training, Certification and Watchkeeping. Which requirement relates to rest hours for watchkeepers?

  1. A maximum of 8 hours of rest in any 24-hour period
  2. A minimum of 4 hours of rest in any 24-hour period
  3. A minimum of 12 hours of work in any 24-hour period
  4. A minimum of 10 hours of rest in any 24-hour period and 77 hours in any 7-day period Correct answer.

Explanation

STCW, as amended, requires a minimum of 10 hours of rest in any 24-hour period and 77 hours in any 7-day period, subject to the specified provisions for watch schedules. These rest hour requirements are recorded in the ship's records of hours of rest.

Question 17International maritime conventions and national regulations

What is the primary purpose of the Maritime Labour Convention, 2006?

  1. To set emission limits for ship engines
  2. To establish minimum working and living conditions for seafarers Correct answer.
  3. To regulate the carriage of dangerous goods
  4. To regulate ship construction standards

Explanation

The Maritime Labour Convention, 2006 consolidates international standards on seafarers' working and living conditions, including minimum age, employment agreements, hours of work and rest, accommodation, food, health protection, medical care and welfare. It is often described as the seafarers' bill of rights.

Question 18International maritime conventions and national regulations

Under the Maritime Labour Convention, 2006, which document issued by the flag State demonstrates that a ship complies with the convention's requirements?

  1. The International Oil Pollution Prevention Certificate
  2. The International Ship Security Certificate
  3. The Maritime Labour Certificate and Declaration of Maritime Labour Compliance Correct answer.
  4. The Safety Management Certificate

Explanation

Ships of 500 gross tonnage and above on international voyages must carry a Maritime Labour Certificate and a Declaration of Maritime Labour Compliance, which together demonstrate compliance with the MLC, 2006. The other certificates relate to security, pollution prevention and safety management.

Question 19International maritime conventions and national regulations

What is the role of a recognised organisation acting on behalf of a flag State?

  1. To investigate marine casualties
  2. To provide port State control inspections
  3. To issue certificates of competency to seafarers
  4. To carry out statutory surveys and certification on behalf of the Administration Correct answer.

Explanation

A recognised organisation, often a classification society, is authorised by a flag State to carry out statutory surveys and issue or endorse certificates on its behalf, in accordance with IMO instruments such as the RO Code. Port State control is carried out by port States, and casualty investigation is a flag State function.

Question 20International maritime conventions and national regulations

A surveyor is examining a ship's tonnage certificate. Which statement best describes net tonnage as defined by the International Convention on Tonnage Measurement of Ships, 1969?

  1. A measure of the ship's earning capacity based on cargo spaces and passenger capacity Correct answer.
  2. A measure of the total enclosed volume of the ship
  3. A measure of the ship's displacement in tonnes
  4. A measure of the ship's lightship weight

Explanation

Under the 1969 Tonnage Convention, gross tonnage is a function of the total enclosed volume, while net tonnage reflects the ship's earning capacity and is based on cargo spaces and passenger capacity, adjusted by a formula. Displacement and lightship weight are not tonnage measures under the convention.

Question 21International maritime conventions and national regulations

Under SOLAS Chapter II-1, what is the purpose of subdivision and damage stability requirements?

  1. To ensure that a ship can survive flooding following assumed damage and remain afloat and stable Correct answer.
  2. To ensure that a ship can reach a minimum speed in heavy weather
  3. To ensure that a ship can carry a minimum quantity of deck cargo
  4. To ensure that a ship can operate without a ballast system

Explanation

SOLAS Chapter II-1 subdivision and damage stability requirements are intended to ensure that, following assumed damage such as collision or grounding, a ship retains sufficient buoyancy and stability to remain afloat and allow evacuation. Speed, deck cargo and ballast system requirements are governed by other provisions.

Question 22International maritime conventions and national regulations

A ship's Safety Management Certificate has expired. Under the ISM Code, what is the maximum period for which a certificate may be issued?

  1. Ten years
  2. Five years Correct answer.
  3. Three years
  4. Two years

Explanation

Under the ISM Code, a Safety Management Certificate is issued for a period not exceeding five years, subject to verification of the safety management system within three months before the expiry date. A Document of Compliance is also issued for a maximum of five years.

Question 23International maritime conventions and national regulations

Under the International Convention on Salvage, 1989, what principle governs the award of salvage remuneration?

  1. A reward based on the salved value of the property and the skill and efforts of the salvors, with special compensation for preventing environmental damage Correct answer.
  2. No cure, no pay, with no allowance for environmental protection
  3. A reward based only on the tonnage of the salved ship
  4. A fixed daily rate set by the flag State

Explanation

The 1989 Salvage Convention provides that salvage remuneration is fixed with a view to encouraging salvage operations, taking into account the salved value of the property, the skill and efforts of the salvors, and other factors, and it introduced special compensation for preventing or minimising environmental damage. The traditional no cure no pay rule is modified by this environmental element.

Question 24International maritime conventions and national regulations

A surveyor is assessing a ship's compliance with the International Convention for the Control and Management of Ships' Ballast Water and Sediments. Which statement correctly describes the D-2 standard?

  1. It sets maximum permissible concentrations of viable organisms and indicator microbes in discharged ballast water Correct answer.
  2. It requires the ship to retain all ballast water on board
  3. It prohibits the carriage of ballast water in tanks shared with cargo
  4. It requires ballast water exchange at sea

Explanation

The D-2 standard under the BWM Convention specifies maximum permissible concentrations of viable organisms by size class and indicator microbes in ballast water discharged into the sea. Ballast water exchange is addressed by the D-1 standard, which is an interim measure.

Question 25International maritime conventions and national regulations

Which convention establishes the framework for the safe and environmentally sound recycling of ships?

  1. The Basel Convention on the Control of Transboundary Movements of Hazardous Wastes
  2. The Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships Correct answer.
  3. The MARPOL Convention
  4. The London Convention on the Prevention of Marine Pollution by Dumping of Wastes

Explanation

The Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships, 2009, establishes requirements for ship recycling facilities, an Inventory of Hazardous Materials and an International Certificate on Inventory of Hazardous Materials. The Basel Convention addresses transboundary movements of hazardous wastes, and the London Convention addresses dumping at sea.

Question 26International maritime conventions and national regulations

A surveyor is asked to confirm the validity of a ship's International Tonnage Certificate issued under the International Convention on Tonnage Measurement of Ships, 1969. Which statement correctly describes the certificate's validity?

  1. It remains valid indefinitely unless the ship's tonnage particulars are altered in a way that changes the assigned tonnages. Correct answer.
  2. It must be renewed every five years, coinciding with the renewal survey for the Safety Construction Certificate.
  3. It lapses automatically whenever the ship changes flag and must be reissued by the new Administration.
  4. It expires after twelve months and is endorsed annually following an inclining experiment.

Explanation

Under the 1969 Tonnage Convention the International Tonnage Certificate has no expiry date; it remains valid for the life of the ship unless alterations cause a change in gross or net tonnage, in which case it is replaced. There is no periodic renewal cycle tied to other statutory certificates.

Question 27International maritime conventions and national regulations

A surveyor is reviewing the certificates of a cargo ship and notes that the Document of Compliance under the ISM Code is held by the company. Which statement correctly describes the relationship between the Document of Compliance and the Safety Management Certificate?

  1. The Document of Compliance is issued to the ship and the Safety Management Certificate to the company office.
  2. The Safety Management Certificate replaces the Document of Compliance once the ship passes its initial verification.
  3. Both documents are issued by the flag State to the ship and expire on the same anniversary date regardless of company audits.
  4. The Safety Management Certificate is issued to the ship only after the company holds a valid Document of Compliance covering that ship type. Correct answer.

Explanation

Under the ISM Code the company is verified and issued a Document of Compliance for each ship type it operates, and a ship is then issued a Safety Management Certificate confirming that the company and its shipboard management operate in accordance with the approved safety management system. The ship certificate depends on the company holding a valid Document of Compliance.

Question 28International maritime conventions and national regulations

A surveyor is verifying the International Anti-Fouling System Certificate for a ship of 500 gross tonnage engaged on international voyages. Which statement correctly reflects the requirement under the AFS Convention?

  1. The certificate is issued by the port State in which the ship last underwent a special survey.
  2. The certificate must be issued following survey and be accompanied by a Declaration on Anti-Fouling System signed by the owner or authorised agent. Correct answer.
  3. The certificate is valid for a maximum of two years and cannot be extended under any circumstances.
  4. The certificate is required only for ships of 400 gross tonnage and above and is issued without any supporting declaration.

Explanation

The AFS Convention requires ships of 400 gross tonnage and above on international voyages to be surveyed and certified, and the certificate must be supported by a Declaration on Anti-Fouling System signed by the owner or an authorised agent. The declaration records the anti-fouling systems applied and confirms compliance.

Question 29International maritime conventions and national regulations

A surveyor is checking a ship's Cargo Ship Safety Equipment Certificate and finds that the ship carries lifebuoys marked with the ship's name but no retro-reflective material. Which conclusion is most defensible under SOLAS Chapter III?

  1. Retro-reflective material is required only on lifejackets, so the lifebuoys are compliant as fitted.
  2. The marking of the ship's name alone satisfies the identification requirement, so no deficiency exists.
  3. The deficiency may be waived because lifebuoys are not subject to the equipment certificate.
  4. The lifebuoys do not meet the requirement that they be fitted with retro-reflective material and the deficiency should be recorded. Correct answer.

Explanation

SOLAS Chapter III and the Life-Saving Appliances Code require lifebuoys to be marked with the ship's name and port of registry and to be fitted with retro-reflective material so they can be located in low light. Missing retro-reflective material is therefore a recordable deficiency affecting the equipment certificate.

Question 30International maritime conventions and national regulations

A surveyor is assessing whether a ship's approved stability instrument complies with the applicable IMO instruments for a bulk carrier. Which combination of instruments most directly governs the requirement for a stability instrument and the associated approval?

  1. MARPOL Annex I and the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk.
  2. SOLAS Chapter II-1 and the International Code on Intact Stability, 2008, as amended. Correct answer.
  3. The ISPS Code and SOLAS Chapter XI-2.
  4. The Load Line Convention and the International Convention on Tonnage Measurement of Ships, 1969.

Explanation

The requirement for a ship to be provided with a stability instrument, and the performance standards for its approval, arise under SOLAS Chapter II-1 supported by the intact stability provisions of the 2008 Intact Stability Code. These instruments together set the criteria the instrument must verify for the ship's loading conditions.

Question 31Ship construction, hull structure and strength

In a longitudinally framed double-bottom tank, the primary structural members running continuously in the fore-and-aft direction to support the inner bottom plating are called:

  1. intercostal stiffeners
  2. centre girders and side girders Correct answer.
  3. transverse frames
  4. floors

Explanation

Longitudinal girders (centre girder and side girders) run continuously fore-and-aft and support the inner bottom, distributing load into the transverse structure. Floors are the transverse members of the double bottom and are cut by the girders.

Question 32Ship construction, hull structure and strength

Which structural member forms the upper boundary of a double-bottom space and the lower boundary of the cargo hold?

  1. Hopper plate
  2. Inner bottom plating Correct answer.
  3. Outer bottom plating
  4. Bilge keel

Explanation

The inner bottom plating is the tank top that closes the double bottom from above and forms the floor of the cargo hold. The outer bottom is the watertight shell below the double bottom.

Question 33Ship construction, hull structure and strength

For a transversely framed side shell, the principal members that carry water pressure from the shell to the decks and double bottom are:

  1. side frames (transverse frames) Correct answer.
  2. shell longitudinals
  3. stringers
  4. web frames only

Explanation

In transverse framing the side frames run from the double bottom to the deck and transmit hydrostatic load to the decks and bottom structure. Stringers support the frames but do not replace them as the primary load path.

Question 34Ship construction, hull structure and strength

The primary purpose of transverse watertight bulkheads in a cargo ship is to:

  1. subdivide the hull into watertight compartments to limit flooding and provide transverse strength Correct answer.
  2. provide longitudinal strength along the deck
  3. increase the ship's deadweight by adding internal volume
  4. support the propeller shafting

Explanation

Watertight bulkheads divide the hull into compartments so that flooding is confined, improving survivability, and they also contribute to transverse strength. They do not add cargo volume or carry shafting loads.

Question 35Ship construction, hull structure and strength

A cofferdam in a tanker is best described as:

  1. an empty space between two bulkheads separating tanks of different contents Correct answer.
  2. a cargo tank with heating coils
  3. a ballast tank at the forepeak
  4. a longitudinal girder in the double bottom

Explanation

A cofferdam is a void space placed between adjacent tanks, for example between cargo oil tanks and ballast or machinery spaces, to prevent leakage between incompatible contents. It is not a cargo or ballast tank itself.

Question 36Ship construction, hull structure and strength

The purpose of a bilge keel is to:

  1. damp rolling by increasing hydrodynamic resistance at the bilge Correct answer.
  2. increase the ship's longitudinal strength
  3. reduce wave-making resistance at the bow
  4. protect the propeller from grounding

Explanation

A bilge keel is a longitudinal fin on the turn of the bilge that sheds vortices and damps roll motion. It does not contribute to longitudinal strength or propeller protection.

Question 37Ship construction, hull structure and strength

In the context of hull girder strength, hogging corresponds to which condition?

  1. Uniform loading with no bending moment
  2. Excess weight amidships with the ends supported, causing the deck to be in compression
  3. Excess buoyancy amidships with the ends relatively unsupported, causing the deck to be in tension Correct answer.
  4. Pure torsional loading of the hull

Explanation

Hogging occurs when buoyancy amidships exceeds weight, so the hull bends with the deck in tension and the bottom in compression. Sagging is the opposite condition.

Question 38Ship construction, hull structure and strength

Which plating is normally the thickest part of the hull girder in a conventional cargo ship, reflecting its role in longitudinal strength?

  1. Sheer strake at the deck edge Correct answer.
  2. Deck plating at the centreline
  3. Bottom shell at the keel
  4. Side shell at mid-height

Explanation

The sheer strake is at the deck edge where the deck and side shell meet, a region of high longitudinal stress and stress concentration, so it is thickened. Mid-height side shell carries lower longitudinal stress.

Question 39Ship construction, hull structure and strength

A ship of length 120 m has a still-water bending moment that places the deck in tension. Which statement about the section modulus requirement is correct?

  1. Only the bottom modulus matters because the bottom is always in tension
  2. The section modulus is independent of the bending moment
  3. The section modulus is set solely by the ship's displacement
  4. The required section modulus is based on the larger of the still-water and wave-induced bending effects, with the deck modulus governing the tensile side Correct answer.

Explanation

Classification rules require the hull girder section modulus to keep bending stresses within allowable limits, using the combined still-water and wave bending moments. Because the neutral axis is usually below mid-depth, deck and bottom moduli differ and both must satisfy the criteria.

Question 40Ship construction, hull structure and strength

A transverse bulkhead in a deep tank is subject to large lateral pressure. Which stiffening arrangement best resists this pressure?

  1. No stiffeners, relying on plate thickness alone
  2. Vertical stiffeners spanning between a top and bottom stool or girder Correct answer.
  3. A single diagonal stiffener
  4. Horizontal stiffeners spanning between the ship's sides only

Explanation

Deep-tank bulkhead stiffeners are normally vertical and span between strong horizontal boundaries such as the top and bottom stools or girders, giving an efficient load path. Plate thickness alone is uneconomic for deep tanks.

Question 41Ship construction, hull structure and strength

In a bulk carrier, the sloping hopper plates in the double bottom serve mainly to:

  1. facilitate self-trimming and discharge of bulk cargo and form part of the double-bottom boundary Correct answer.
  2. provide additional deck area
  3. support the main engine seating
  4. increase the ship's metacentric height

Explanation

Hopper plates slope from the inner bottom up to the side shell so that bulk cargo flows toward the hold centre for easy discharge, and they also form the upper boundary of the double-bottom wing tanks. They are not primarily a stability or machinery support feature.

Question 42Ship construction, hull structure and strength

A surveyor finds that a deck longitudinal has cracked at a welded connection to a transverse frame. Which factor is the most likely contributor to fatigue cracking at this detail?

  1. Stress concentration at the weld toe combined with cyclic wave-induced loading Correct answer.
  2. Excessive paint thickness on the longitudinal
  3. Insufficient cargo hold lighting
  4. Incorrect sounding pipe routing

Explanation

Fatigue cracks initiate where geometric discontinuity raises local stress, such as a weld toe at a bracket or frame connection, and grow under repeated wave-induced stress cycles. Paint, lighting and piping do not drive fatigue.

Question 43Ship construction, hull structure and strength

During a survey, buckled plating is found in the bottom shell between floors. Which loading condition most plausibly explains compression buckling in this region?

  1. Thermal expansion of the deck
  2. Sagging condition placing the bottom in compression Correct answer.
  3. Pure torsional loading of the hull
  4. Hogging condition placing the bottom in tension

Explanation

In sagging the hull bends downward amidships, putting the bottom shell into compression, which can cause buckling of slender panels between floors. Hogging puts the bottom in tension, which does not cause compressive buckling.

Question 44Ship construction, hull structure and strength

In a container ship, which structural feature is typically provided to carry the concentrated loads from container stacks and lashing forces?

  1. A skeg at the stern
  2. A bulbous bow
  3. Bilge keels along the turn of the bilge
  4. Hatch side girders and transverse hatch-end beams around large hatch openings Correct answer.

Explanation

Large hatch openings interrupt the deck, so heavy hatch side girders and hatch-end beams are fitted to carry container loads and lashing forces and to restore longitudinal continuity. Bilge keels, bulbous bows and skegs serve other purposes.

Question 45Ship construction, hull structure and strength

The purpose of a shear strake in hull girder strength is to:

  1. serve as a rubbing strake for tugs
  2. provide a doubling plate for berthing contact
  3. act as a drainage channel for deck water
  4. carry the high shear and longitudinal stresses at the deck edge and maintain continuity between deck and side shell Correct answer.

Explanation

The sheer strake is the uppermost side strake, connecting the deck to the side shell at a location of high longitudinal stress and shear, so it is thickened and carefully detailed. It is not a fender or drainage feature.

Question 46Ship construction, hull structure and strength

A midship transverse section shows the neutral axis located below mid-depth. Which consequence for bending stress is correct?

  1. The bottom stress exceeds the deck stress
  2. For a given bending moment, the deck stress exceeds the bottom stress Correct answer.
  3. No bending stress develops at the deck
  4. The deck and bottom stresses are always equal

Explanation

Bending stress is proportional to distance from the neutral axis, so the surface farther from the neutral axis develops higher stress. With the neutral axis below mid-depth, the deck is farther away and sees higher stress than the bottom.

Question 47Ship construction, hull structure and strength

Which structural arrangement is typical of the longitudinal framing system in the bottom of a large oil tanker?

  1. Closely spaced bottom longitudinals supported by widely spaced transverse web frames and floors Correct answer.
  2. Only a centre girder with no side girders
  3. Closely spaced transverse floors with no longitudinals
  4. Diagonal bracing between the inner and outer bottom

Explanation

Longitudinal framing uses many closely spaced longitudinals running fore-and-aft, supported at intervals by deep transverse web frames and floors. This gives efficient longitudinal strength for large ships.

Question 48Ship construction, hull structure and strength

A surveyor notes that a pitting corrosion wastage allowance has been exceeded on the side shell in a cargo hold. What is the most appropriate structural consequence to assess?

  1. Improvement in fatigue life of the affected plate
  2. Increase in the ship's stability range
  3. Reduction in net scantlings and local strength, requiring renewal or reinforcement per the applicable rules Correct answer.
  4. No action because corrosion increases plate roughness only

Explanation

Corrosion reduces net plate thickness and hence local and global strength, so the surveyor assesses remaining scantlings against rule requirements and specifies renewal or reinforcement. Corrosion does not improve fatigue life or stability.

Question 49Ship construction, hull structure and strength

The function of a transverse ring frame in a submarine pressure hull is to:

  1. support the propeller shaft
  2. serve as a ballast tank boundary only
  3. prevent collapse of the circular hull under external hydrostatic pressure by reducing the effective buckling length Correct answer.
  4. provide hydrodynamic lift

Explanation

Ring frames stiffen the circular pressure hull, shortening the unsupported length of shell so that it can resist external pressure without buckling or collapse. They are not lifting or shaft-support members.

Question 50Ship construction, hull structure and strength

Which statement correctly describes the load path for a wave-induced vertical bending moment in a ship hull?

  1. It is resisted by the combined longitudinal stiffness of deck, side shell and bottom plating acting as a box girder Correct answer.
  2. It is resisted mainly by the transverse frames acting alone
  3. It is resisted by the bilge keels
  4. It is resisted by the hatch covers

Explanation

The hull acts as a box girder in which the deck, side shell and bottom plating together resist vertical bending, with longitudinals distributing the load. Transverse frames, bilge keels and hatch covers are not the primary longitudinal bending path.