Maharashtra HSC Multi-Skill General Engineering (NSQF) common mistakes
Maharashtra HSC Multi-Skill General Engineering (NSQF) · Understand the traps and how to avoid them.
In workshop safety questions, choosing the answer that describes the fastest way to clear a jammed machine or finish a job, instead of the answer that requires isolating power and locking out first.
Candidates reason from the pressure of a real workshop floor ('get it running again') rather than from the safety hierarchy; they also confuse 'switching off' with full isolation and lockout, so an option like 'switch off and remove the guard to reach in' looks acceptable.
What to do instead
Memorise the fixed order for any intervention: inform, isolate, lock and tag, verify dead, then work. Drill on the rule that no guard is removed and no hand enters a danger zone while energy can be restored by someone else. When two options both seem safe, pick the one that adds a barrier or verification step.
Reading a multi-view engineering drawing as if each view were a separate object, then answering questions about hidden edges or hole positions from the wrong view.
Candidates learn first-angle and third-angle projection as definitions but never practise mentally folding the views back into one solid, so they cannot tell which feature in the front view corresponds to which line in the top or side view.
What to do instead
Before answering, state aloud the projection convention used and where the top view sits relative to the front view. Trace one feature at a time across views using projection lines. Practise sketching the missing third view from two given views until the fold-back habit is automatic.
Applying Ohm's law and series/parallel rules to a whole circuit without first reducing it, or mixing up the current and voltage in each branch.
Candidates memorise V = IR but skip the step of identifying which resistors are actually in series or parallel, especially when a wire creates a short across a component; they also forget that current is common in series while voltage is common in parallel.
What to do instead
Redraw the circuit every time, marking nodes with letters, and combine resistors step by step before substituting numbers. Check the answer by computing total power and confirming it equals the sum of branch powers. Treat any plain wire across a component as a short and remove that component from the calculation.
Choosing a manufacturing process or material by name association ('cast iron is cast, so it is used for a crankshaft') rather than by matching the property required to the process capability.
Candidates revise process lists as vocabulary instead of linking each process to what it is good at: sand casting for complex internal cavities, forging for toughness and grain flow, rolling for long sections, extrusion for constant cross-section.
What to do instead
Build a two-column table for each process: shape complexity, tolerance, surface finish, typical defects, and one everyday example. When a question names a part, first write the property that part needs (toughness, wear resistance, dimensional accuracy), then pick the process that delivers it.
Confusing the function of a mechanism's parts, for example treating a bearing as a driver, a belt as a positive drive, or a clutch as a speed reducer.
Diagrams in textbooks show complete assemblies, and candidates remember the picture rather than the power flow; terms like 'slip', 'ratio' and 'torque' get attached to the wrong component.
What to do instead
For every mechanism, trace the power path from source to output and label each element with its single job: transmit, support, guide, engage/disengage, or change speed. Learn the one distinguishing fact per element (belt slips under overload, chain does not; clutch disconnects under load, brake stops motion).
Selecting a tool by appearance rather than by the material and operation, for example using a hardened punch on a hardened surface or a fine file for rapid metal removal.
Candidates see tool pictures without the accompanying rule about hardness matching and cutting geometry, so they miss that a tool must be harder than the work and that each tool has a correct speed and feed.
What to do instead
Learn one sentence per tool: what it cuts, what it must not cut, and the maintenance point (keep files clean and never use without a handle; never strike a hardened surface with a hardened hammer). Link tool choice to the material's hardness before answering.
Reporting a measurement with more decimal places than the instrument can support, or ignoring zero error and parallax when reading a vernier or micrometer.
Candidates copy the digital display habit of long decimals and forget that least count sets the limit of meaning; they also forget to subtract the zero error recorded at the start.
What to do instead
Always state the least count first, then round the answer to that place. Practise the vernier reading as main scale plus (coinciding division × least count), and apply the zero correction with its sign. For micrometer, remember the thimble has 50 divisions and one revolution equals 0.5 mm.
Using a formula from memory without checking units or the physical situation, for example substituting centimetres into a formula expecting metres, or using the wrong area for stress.
Applied science questions embed unit conversions and geometry inside the calculation, and candidates focus on the number rather than the quantity; stress versus force and mass versus weight get interchanged.
What to do instead
Write the known quantities with units, convert to SI before substituting, and carry units through the calculation to see whether the result's unit matches what is asked. For stress, identify the load direction and use the cross-section perpendicular to it.
Answering employability-skills questions with generic virtue words ('hard work', 'discipline') instead of the specific behaviour the situation demands, such as reporting a hazard, asking for clarification, or documenting a handover.
These questions are scenario-based, but candidates treat them as moral-reasoning items and pick the most admirable-sounding option rather than the one that solves the stated workplace problem.
What to do instead
Read the scenario and identify the actual risk or communication gap. Choose the option that is specific, immediate, and within the worker's authority; escalate when the issue exceeds that authority. Reject options that hide the problem or bypass the supervisor.
In communication and entrepreneurship items, confusing the purpose of a document, for example writing a quotation as if it were an invoice, or treating a business plan as a product brochure.
Candidates know the words but not the transaction each document records; they also underestimate costing, forgetting that price must cover overheads and margin, not just material.
What to do instead
Learn each document by the question it answers: enquiry asks availability, quotation states price and validity, purchase order commits to buy, invoice demands payment, receipt confirms payment. For costing, always add material, labour, overhead and profit before quoting a price.