Engineering Entrance Exams

NMDC HEM Operator Vacancy 2026: Apply Online, Selection Process

📅 Updated On 10 October 2026✨ Update By Jyoti Sharma🌐 Hindi & English

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NMDC HEM Operator & Mechanic Grade-III (Trainee) Syllabus 2026, Exam Pattern

NMDC HEM Operator & Mechanic Grade-III (Trainee) Syllabus 2026, Exam Pattern, Exam Date 2026

Detail Information about NMDC has published notification 2026 for the recruitment of HEM Operator & Mechanic Grade-III (Trainee) vacancies. Those Candidates who are Interested to the following vacancy and completed all Eligibility Criteria can read the Notification & Apply Online. In this page we provide the Complete Syllabus of this Recruitment with Latest Update Exam Pattern and the Exam Date also.

NMDC HEM Operator & Mechanic Syllabus 2026 – Overview

Organization Name	National Mineral Development Corporation (NMDC Steel)
Post Name	HEM Operator & Mechanic Grade-III (Trainee) (RS-04)
Number of Posts	Notified Soon
NMDC Exam Date 2026	Notified Soon
Category	Syllabus and Exam Pattern
Official website	www.nmdc.co.in

NMDC HEM Operator & Mechanic Grade-III (Trainee) Syllabus 2026

Part I - Subject Knowledge (on specific trade)

Mechanical

1. Mechanics and Design :

Engineering Mechanics : Free-body diagrams and equilibrium, trusses and frames, virtual work, kinematics and dynamics of particles and of rigid bodies in plane motion, impulse and momentum (linear and angular) and energy formulations, collisions.

Mechanics of Materials : Stress and strain, elastic constants, Poisson's ratio; Mohr’s circle for plane stress and plane strain, thin cylinders, shear force and bending moment diagrams, bending and shear stresses, deflection of beams, torsion of circular shafts, Euler’s theory of columns, energy methods, thermal stresses, strain gauges and rosettes, testing of materials with universal testing machine, testing of hardness and impact strength.

Theory of Machines : Displacement, velocity and acceleration analysis of plane mechanisms, dynamic analysis of linkages, cams, gears and gear trains, flywheels and governors, balancing of reciprocating and rotating masses, gyroscope.

Vibrations : Free and forced vibration of single degree of freedom systems, effect of damping, vibration isolation, resonance, critical speeds of shafts.

Machine Design : Design for static and dynamic loading, failure theories, fatigue strength and the S-N diagram, principles of the design of machine elements such as bolted, riveted and welded joints, shafts, gears, rolling and sliding contact bearings, brakes and clutches, springs.

2. Fluid Mechanics and Thermal Sciences :

Fluid Mechanics : Fluid properties, fluid statics, manometry, buoyancy, forces on submerged bodies, stability of floating bodies, control-volume analysis of mass, momentum and energy, fluid acceleration, differential equations of continuity and momentum; Bernoulli’s equation, dimensional analysis, viscous flow of incompressible fluids, boundary layer, elementary turbulent flow, flow through pipes, head losses in pipes, bends and fittings.

Heat-Transfer : Modes of heat transfer, one dimensional heat conduction, resistance concept and electrical analogy, heat transfer through fins, unsteady heat conduction, lumped parameter system, Heisler's charts, thermal boundary layer, dimensionless parameters in free and forced convective heat transfer, heat transfer correlations for flow over flat plates and through pipes, effect of turbulence, heat exchanger performance, LMTD and NTU methods, radiative heat transfer, Stefan- Boltzmann law, Wien's displacement law, black and grey surfaces, view factors, radiation network analysis.

Heat-Transfer : Modes of heat transfer, one dimensional heat conduction, resistance concept and electrical analogy, heat transfer through fins, unsteady heat conduction, lumped parameter system, Heisler's chart, thermal boundary layer, dimensionless parameters in free and forced convective heat transfer, heat transfer correlations for flow over flat plates and through pipes, effect of turbulence, heat exchanger performance, LMTD and NTU methods, radiative heat transfer, Stefan- Boltzmann law, Wien's displacement law, black and grey surfaces, view factors, radiation network analysis.

Applications : Power Engineering : Air and gas compressors; vapour and gas power cycles, concepts of regeneration and reheat. I.C. Engines: Air-standard Otto, Diesel and dual cycles. Refrigeration and air conditioning: Vapour and gas refrigeration and heat pump cycles; properties of moist air, psychrometric chart, basic psychrometric processes. Turbo machinery: Impulse and reaction principles, velocity diagrams, Pelton-wheel, Francis and Kaplan turbines.

3. Materials, Manufacturing and Industrial Engineering :

Engineering Materials : Structure and properties of engineering materials, phase diagrams, heat treatment, stress-strain diagrams for engineering materials.

Casting, Forming and Joining Processes : Different types of castings, design of patterns, moulds and cores, solidification and cooling, riser and gating design. Plastic deformation and yield criteria, fundamentals of hot and cold working processes, load estimation for bulk (forging, rolling, extrusion,

drawing) and sheet (shearing, deep drawing, bending) metal forming processes, principles of powder metallurgy. Principles of welding, brazing, soldering and adhesive bonding.

Machining and Machine Tool Operations : Mechanics of machining, basic machine tools, single and multi-point cutting tools, tool geometry and materials, tool life and wear, economics of machining, principles of non-traditional machining processes, principles of work holding, design of jigs and fixtures.

Metrology and Inspection : Limits, fits and tolerances, linear and angular measurements, comparators, gauge design, interferometry, form and finish measurement, alignment and testing methods, tolerance analysis in manufacturing and assembly.

Computer Integrated Manufacturing : Basic concepts of CAD/CAM and their integration tools.

Production Planning and Control : Forecasting models, aggregate production planning, scheduling, materials requirement planning.

Inventory Control : Deterministic models, safety stock inventory control systems.

Operations Research : Linear programming, simplex method, transportation, assignment, network flow models, simple queuing models, PERT and CPM.

Part II

Numerical Ability

1. Relationship Concepts

2. Arithmetical Reasoning

3. Decision-Making

4. Space Visualization

5. Verbal & Figure Classification

6. Analysis & Judgment

7. Coding-Decoding

8. Similarities & Differences

9. Problem-Solving

10. Analogies

11. Directions

12. Arithmetical Number Series

13. Figural Series

14. Discrimination

15. Visual Memory

16. Data Sufficiency

Reasoning Ability

1. Puzzles

2. Data Interpretation

3. Analytical Reasoning

4. Verbal Reasoning

5. Non-Verbal Reasoning

6. Logical Reasoning

7. Data Sufficiency

General Knowledge

1. Botany

2. Indian Parliament

3. Inventions in the World

4. Basic Computer

5. Physics

6. Famous Days & Dates

7. Indian Economy

8. Geography

9. Famous Books & Authors

10. Zoology

11. Environment

12. Sports

13. Indian Politics

14. Indian Culture

15. Chemistry

16. Indian History

NMDC HEM Operator & Mechanic Grade-III (Trainee) Exam Pattern 2026

Duration : 120 Minutes

S.No.	Subject	No.of Question	Marks
Part 1	Subject Knowledge (On Specific Trade)	30	30
Part 2	General Knowledge	50	50
	Numerical & Reasoning Ability	20	20
	Total	100	100

Exam Date 2026 : Notified Soon

Starting Date of Application Form : Notified Soon

Last Date of Application Form : Notified Soon

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NMDC HEM Operator & Mechanic Grade-III (Trainee) Exam - Hindi100 questions • 120 mins • 100 marks

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