ISRI Entrance Examination common mistakes
ISRI Entrance Examination · Understand the traps and how to avoid them.
Classifying a mixed-load pile by its most visually prominent metal instead of separating and identifying each grade present, then assigning the whole load a single grade code.
Candidates rely on a quick visual impression and do not run through the grade-definition checklist (alloy family, coating, contamination, thickness) for each component, so a load containing several grades is graded as one.
What to do instead
Practice decomposing photographed or described piles into constituent items, applying the grade checklist to each item, and then determining the correct multi-grade or downgraded classification with justification for each component.
Confusing similar-looking nonferrous grades (for example, distinguishing between different aluminum or copper-bearing scrap categories) and selecting a grade based on colour alone.
Colour and surface appearance overlap heavily across alloy families, and candidates have not internalized secondary identifiers such as density, hardness, coating, or typical applications of the source material.
What to do instead
Build a comparison matrix for each nonferrous family listing colour, density, magnetic response, coating, and common source products, and drill on near-miss pairs until the distinguishing feature is automatic.
Treating all ferrous scrap as interchangeable and ignoring how residual elements (copper, tin, sulfur, phosphorus) and coating affect steelmaking suitability.
Candidates memorize grade names without connecting them to the metallurgical consequences of residuals, so they cannot explain why a given grade is restricted or downgraded.
What to do instead
Study each major residual element's effect on steel properties and map it to the grades that limit it, then answer scenario questions about why a load would be rejected or blended.
Recommending a single processing step (for example, shredding or baling) for every material stream without matching the equipment to the material's properties and downstream specification.
Candidates learn equipment names in isolation and do not connect feed characteristics (size, density, friability, contamination) to equipment capability and output requirements.
What to do instead
For each major equipment type, write out its feed constraints, typical outputs, and common failure modes, then solve matching problems where the feed and desired output are given and the equipment must be justified.
Answering safety questions by naming the correct PPE or procedure but omitting the hazard-control hierarchy or the specific triggering condition that makes the control necessary.
Candidates memorize lists of PPE and rules rather than the logic of hazard recognition and control, so they miss questions that ask why or when a control applies.
What to do instead
Practice framing each safety answer as hazard identified, exposure route or mechanism, control selected, and verification step, and study the hierarchy of controls so engineering and administrative controls are not skipped in favour of PPE.
Confusing gross, tare, and net weights, or applying the wrong unit conversion, when computing shipment or inventory quantities.
Candidates rush the arithmetic and do not consistently define which weight basis a question is asking for, especially when mixing short tons, long tons, metric tonnes, and pounds.
What to do instead
Adopt a fixed written procedure: state the weight basis requested, list gross, tare, and net explicitly, convert units with a shown factor, and sanity-check the result against the expected magnitude before selecting an answer.
Treating a quoted scrap price as a fixed number rather than as a function of a published index, a discount or premium to that index, and the settlement period.
Candidates learn price levels but not the pricing mechanics, so they cannot interpret how a change in the underlying index or the negotiated discount moves the final transaction price.
What to do instead
Work through pricing scenarios where the index, discount, and settlement date are varied independently, and practise stating the final price formula in words before computing.
Ignoring documentation and transport-classification requirements when answering shipping or export questions, focusing only on the physical material.
Candidates treat regulatory and trade topics as separate from material knowledge and do not connect a material's characteristics to its shipping description, required paperwork, or handling restrictions.
What to do instead
For each major scrap category, build a one-page reference covering likely shipping classification, required documentation, and key handling restrictions, and practise questions that require linking material properties to compliance steps.
Answering customer-relations scenarios with a policy statement rather than a resolution process that acknowledges the customer's position and specifies concrete next steps.
Candidates default to reciting company rules and miss that scenario questions reward sequencing, communication, and documented follow-through.
What to do instead
Use a repeatable structure for service scenarios: acknowledge, gather facts, state what can be done and when, confirm agreement, and document; practise applying it to complaints about grades, weights, and pricing.
Failing to connect environmental compliance obligations to day-to-day operations, such as stormwater, dust, or fluid management, and answering only in terms of end-of-pipe permits.
Candidates study regulations as abstract lists and do not map each requirement to the operational activity that creates the obligation.
What to do instead
Create a table pairing each common environmental requirement with the site activity that triggers it, the control used, and the record kept, then answer scenario questions by tracing from activity to obligation to evidence.