Iran Nezam Mechanical Design Exam study plan

Build a one-page formula sheet for heating and cooling load calculation (conductive, solar, internal, infiltration gains) and solve 12 load-assembly problems from scratch without notes

Derive and apply the psychrometric relations for humidity ratio, enthalpy, and dew point; plot 10 air-conditioning processes on a sketch chart and read off coil loads

Compute duct sizing by equal-friction and velocity methods for three branch layouts, and state the static-pressure budget for each

Size a hydronic heating circuit (flow rate, pump head, pipe diameter) for a 3-zone example and check the result against velocity limits

List the Iranian code clauses that govern ventilation rates and building envelope thermal performance, and map each to the design step it constrains

Design a complete air-side system for a 400 m2 office: select equipment capacity, lay out diffusers, and justify the air distribution pattern

Perform a stack-effect and wind-pressure calculation for a 6-storey building and explain how the result changes the envelope airtightness strategy

Compare a VAV and a fan-coil system on part-load energy and maintenance for the same building, and defend one choice in writing

Extract the mandatory Iranian building regulation requirements on energy efficiency, fire compartmentation of shafts, and mechanical ventilation, and turn them into a 20-item design checklist

Solve 15 mixed HVAC multiple-choice questions under a 25-minute timer and log every wrong answer with its root cause

Solve 15 closed-system and open-system first-law problems involving steam tables, throttling, and mixing, showing every state point

Compute the thermal efficiency of a Rankine cycle with one feedwater heater, then quantify the efficiency gain over the simple cycle

Analyze conduction through a composite wall and a finned surface, and compute a convection coefficient from a Nusselt correlation

Size a shell-and-tube heat exchanger by LMTD and by effectiveness-NTU, and reconcile the two answers

Explain in writing why a boiler efficiency quoted on HHV differs from one quoted on LHV, and convert between them for a natural-gas case

Solve 20 statics problems on trusses, frames, and friction, drawing complete free-body diagrams for each

Compute shear-force and bending-moment diagrams for six beam and loading combinations, and identify the maximum moment location every time

Apply Mohr's circle to 10 combined-stress states and determine principal stresses and maximum shear

Solve 12 dynamics problems covering work-energy, impulse-momentum, and rigid-body rotation

Work 10 applied-mathematics items on eigenvalues, Laplace transforms, and numerical integration, and note the solution shortcut for each

Design a shaft for combined bending and torsion with fatigue loading, applying a stress-concentration factor and a safety factor, and verify the result

Select rolling bearings for a given radial and axial load and a target L10 life, and justify the selection with the catalog calculation

Design a spur-gear pair: determine module, tooth count, and face width from a power and speed requirement, then check bending and contact stress

Analyze a bolted and a welded joint under eccentric load and determine the governing stress

Solve 15 machine-design multiple-choice questions under timed conditions and correct every error against first principles

Apply Bernoulli and the energy equation to 12 pipe-flow problems including pumps, turbines, and losses, and compute friction factors from the Moody chart and Colebrook relation

Select a centrifugal pump for a system curve, determine the operating point, and check for cavitation using NPSH available versus required

Size a domestic water supply system: fixture units, demand flow, pipe diameters, and residual pressure at the topmost fixture

Design a sanitary drainage stack and vent system for a multi-storey building, checking slope, stack capacity, and vent sizing

Lay out a fire-protection system: classify the occupancy hazard, determine sprinkler density and coverage, and size the main and branch lines

Compare five manufacturing processes (casting, forging, machining, sheet forming, additive) on tolerance, surface finish, and cost at three production volumes, and choose one for a specific part

Specify a welding process and joint preparation for a pressure-retaining component, and state the inspection method and acceptance criteria

Select a material for a corrosive and a high-temperature application, justifying the choice with mechanical and metallurgical reasoning

Read a welding procedure specification and identify the essential variables that would require requalification if changed

Check a pipe-support and expansion-loop layout for thermal growth over a 120 C temperature swing and confirm the loop is adequate

Assemble a consolidated regulatory reference covering professional registration duties, design responsibility, drawing submission, and supervision stages in Iran

Complete two full-length timed mock exams under exam conditions and score each by domain

Re-derive the 30 formulas most often missed across all mocks from memory and verify each against a worked example

Rewrite the weakest three domain summaries into a single condensed revision sheet of no more than four pages

State, for each of the nine domains, the three question patterns most likely to appear and the standard approach to each