MARINA OIC-EW Theoretical Exam common mistakes
MARINA OIC-EW Theoretical Exam · Understand the traps and how to avoid them.
When a question asks for the immediate action on discovering a machinery-space fire or a fuel-oil leak, the candidate lists the full emergency sequence (alarm, muster, report to bridge, notify company, stop ventilation) in the wrong order or skips isolating the fuel/air supply, instead reciting the general alarm procedure first.
Candidates memorise the muster-list and alarm-announcement wording from SOLAS/ISM drills and treat it as the answer to every emergency question, instead of identifying the specific first action that limits the hazard (isolating fuel, stopping forced ventilation, activating the fixed system per the question's scenario).
What to do instead
Practise sorting emergency questions into 'first action to contain the hazard' versus 'notification and muster'. For machinery-space fire, the sequence starts with sounding the alarm and stopping the fuel supply and ventilation before releasing the fixed extinguishing system; for a fuel leak, isolate the source and remove ignition sources first. Write the sequence for each scenario once and check the order against the question's exact wording.
In stability and loading questions, the candidate computes GM by subtracting KG from KM but then applies free surface correction or shifting-weight effects in the wrong direction, or confuses GZ with GM when the question asks about initial versus overall stability.
Candidates learn the GM = KM − KG formula as a ritual and do not track what each term means physically, so a small change in wording (free surface, suspended weight, off-centre load) flips the sign of the correction.
What to do instead
Before calculating, sketch the transverse section and mark K, G, B and M. State in words whether the change raises or lowers G. Treat free surface as a virtual rise of G (reduces GM), a weight loaded below G as lowering G, and a suspended weight as acting at the point of suspension. Answer 'what does the question ask - initial GM, corrected GM, or righting lever at angle θ' before touching numbers.
On MARPOL questions the candidate names the correct Annex number but applies the wrong discharge criterion - for example giving the 15 ppm limit for oily bilge water when the question concerns machinery-space bilge water outside special areas, or quoting the 15 ppm equipment standard as the 15 ppm discharge standard without the 15 ppm alarm and stopping arrangement.
Annex I limits (15 ppm, 100 ppm, 15 ppm alarm, special areas) blur together during revision, and candidates answer from memory of a number rather than from the regulation's structure.
What to do instead
Build a one-page table for Annex I only: oily water separator standard (15 ppm), discharge conditions (not in special areas, ship proceeding en route, approved equipment operating, oil record book entry), and the special-area list. For each practice question, identify which of these four conditions the question is testing before choosing an answer.
In electrical fault questions the candidate diagnoses from the symptom directly to a component (e.g. 'the breaker tripped, so the motor is burnt') without stating the test or measurement that would confirm it, and without checking the simplest causes (overload, single phasing, earth fault, loose connection) in order.
Candidates study protection devices as definitions rather than as a diagnostic sequence, so they jump to the dramatic fault and skip insulation-resistance, continuity and current measurements.
What to do instead
Answer electrical fault questions with a stated test plan: isolate and lock off, then measure insulation resistance, winding resistance and supply voltage/phase balance, and inspect for overheating and loose terminals before condemning a component. Learn the signature of single phasing (one phase current high, others low, motor hums and overheats) and of an earth fault (insulation resistance to earth low).
When asked about watchkeeping and handover, the candidate describes the relief procedure correctly but fails to state the conditions under which the watchkeeper must not hand over or must call the duty engineer - for example handing over with a machinery alarm outstanding or a running auxiliary in an abnormal condition.
The handover ritual (logbook, outstanding defects, standing orders) is easy to memorise, but the refusal/call criteria are stated as principles in STCW and engine-room standing orders and are rarely rehearsed as concrete triggers.
What to do instead
Learn a short trigger list for 'do not hand over / call the duty engineer': unexplained alarms, abnormal temperatures or pressures, machinery running outside limits, ongoing maintenance with a system isolated, and any doubt about the safety of the plant. Practise phrasing answers as 'hand over only when…' and 'call the duty engineer when…'.
In maintenance and repair questions the candidate describes the repair but omits the permit-to-work and isolation controls - locking off, tagging, proving dead, blanking, draining and gas-freeing - or treats them as optional paperwork after the job is described.
Candidates focus on the technical procedure (how to renew a pump gland or open a heat exchanger) and treat safety controls as background, so they lose the marks attached to isolation and permit requirements.
What to do instead
For every maintenance question, state isolation and permit controls first, then the technical steps, then restoration and testing. Learn the permit-to-work elements as a checklist: request and authorisation, isolation and lock/tag, prove dead or gas-free, drain and vent, work, remove isolations, test, close the permit and record.
On STCW and MLC questions the candidate confuses rest-hour and watch-schedule limits, or gives the certificate-of-competency validity and revalidation requirements from an older edition - for example quoting the wrong minimum rest period or the wrong sea-service requirement for revalidation.
STCW and MLC numbers (10 hours rest in 24, 77 hours in 7 days, 5-year CoC validity, 12 months sea service in the last 5 years) are similar in shape and are revised, so candidates mix them or rely on outdated notes.
What to do instead
Keep a single current-figures card for STCW/MLC: minimum rest, maximum watch period, CoC validity and revalidation sea service, medical certificate validity, and basic/advanced training refresher intervals. Verify each figure against the current regulation text or an authoritative summary before the exam, and answer only from that card.
In main propulsion and auxiliary machinery questions the candidate describes what a component does but cannot explain the consequence of its failure on the rest of the plant - for example what happens to the fuel supply, starting air or lubrication system when a specific pump, cooler or controller fails.
Revision is organised by component (purifier, cooler, governor) rather than by system, so candidates know the item in isolation and cannot trace the effect through the system during a fault scenario.
What to do instead
Revise by system diagram: fuel oil, lubricating oil, cooling water, starting air, exhaust gas and steam. For each, mark the redundancy (standby pumps, auto-start), the critical parameters, and the immediate action if each item fails. Practise 'if X fails, what happens next and what do you do' chains aloud.
When a question asks for the action after a pollution incident or an equipment failure with environmental risk, the candidate jumps to notifying the company or flag state and omits the ship's immediate obligations - stopping the discharge, containing the spill, and making the required entry in the oil record book or reporting to the nearest coastal state.
Candidates memorise reporting hierarchies from ISM drills and treat notification as the whole answer, missing the immediate containment and record-keeping steps that the question is testing.
What to do instead
Answer pollution questions in a fixed order: stop the source, contain and clean up, record in the oil record book or garbage record book, report to the master and then to the required authorities (coastal state, flag state, company per the SMS). Learn which record book applies to which Annex and which reports go to the coastal state.
In resource-management and human-factor questions the candidate gives a generic answer ('communicate well, use the checklist, be a good team leader') without naming the specific behaviour - closed-loop communication, challenge and response, briefing before a task, or the fatigue and workload factors that make the error likely.
Bridge and engine-room resource management is taught as principles, and candidates answer with slogans instead of the observable behaviours the examiner is asking for.
What to do instead
Learn the named behaviours and use them in answers: brief before the job, assign roles, use closed-loop communication (order, repeat-back, confirm), encourage challenge and response, and call out fatigue or distraction. For each scenario, name the behaviour that was missing and the one that would have prevented the outcome.