Junior Engineer

SSC-JEStaff Selection Commission

MechanicalEngineering

Topicwise Objective Solved Questions

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Also useful for RRB-JE Mains as well as various public sector examinations and other competitive examinations

Previous Years Solved Papers : 2007-2019

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SSC-Junior Engineer : Mechanical Engineering Previous Year Solved PapersCopyright © by MADE EASY Publications.All rights are reserved. No part of this publication may be reproduced, stored in or introduced into a retrieval

system, or transmitted in any form or by any means (electronic, mechanical, photo-copying, recording or

otherwise), without the prior written permission of the above mentioned publisher of this book.

First Edition: 2016

Second Edition: 2018

Third Edition: 2019

Fourth Edition: 2020

Publications

Staff Selection Commission-Junior Engineer has always been preferred by

Engineers due to job stability. SSC-Junior Engineer examination is conducted

every year. MADE EASY team has deeply analyzed the previous exam papers and

observed that a good percentage of questions are repetitive in nature, therefore

it is advisable to solve previous years papers before a candidate takes the exam.

The SSC JE exam is conducted in two stages as shown in table given below.

Papers Subject Maximum Marks Duration

Stage 1:

Paper-I : Objective type

(i) General Intelligence & Reasoning

(ii) General Awareness

(iii) General Engineering : Mechanical

50 Marks

50 Marks

100 Marks

2 hours

Stage 2:

Paper-II : Conventional Type

General Engineering : Mechanical 300 Marks 2 hours

Note: In Paper-I, every question carry one mark and there is negative marking of ¼ marks for every wrong answer.

Candidates shortlisted in Stage 1 are called for Stage 2. On the basis of combined score in Stage 1 and Stage 2, final

merit list gets prepared.

MADE EASY has taken due care to provide complete solution with accuracy. Apart from Staff Selection Commission-Junior

Engineer, this book is also useful for Public Sector Examinations and other competitive examinations for engineering graduates.

I have true desire to serve student community by providing good source of study and quality guidance. Any suggestion

from the readers for improvement of this book is most welcome.

With Best Wishes

B. Singh

CMD, MADE EASY

Preface

Syllabus of Engineering Subjects (For both Objective and Conventional Type Papers)

Mechanical EngineeringTheory of Machines and Machine Design: Concept of simple machine, Four bar linkage and link motion, Flywheels and fluctuation of energy, Power transmission by belts – V-belts and Flat belts, Clutches – Plate and Conical clutch, Gears – Type of gears, gear profile and gear ratio calculation, Governors – Principles and classification, Riveted joint, Cams, Bearings, Friction in collars and pivots.

Engineering Mechanics and Strength of Materials: Equilibrium of Forces, Law of motion, Friction, Concepts of stress and strain, Elastic limit and elastic constants, Bending moments and shear force diagram, Stress in composite bars, Torsion of circular shafts, Buckling of columns – Euler’s and Rankin’s theories, Thin walled pressure vessels

Thermal Engineering: Properties of Pure Substances : p-v & P-T diagrams of pure substance like H2O, Introduction of steam table with respect to steam generation process; definition of saturation, wet & superheated status. Definition of dryness fraction of steam, degree of superheat of steam. h-s chart of steam (Mollier’s Chart).1st Law of Thermodynamics : Definition of stored energy & internal energy, 1st Law of Thermodynamics for cyclic process, Non Flow Energy Equation, Flow Energy & Definition of Enthalpy, Conditions for Steady State Steady Flow; Steady State Steady Flow Energy Equation.2nd Law of Thermodynamics : Definition of Sink, Source Reservoir of Heat, Heat Engine, Heat Pump & Refrigerator; Thermal Efficiency of Heat Engines & co-efficient of performance of Refrigerators, Kelvin – Planck & Clausius Statements of 2nd Law of Thermodynamics, Absolute or Thermodynamic Scale of temperature, Clausius Integral, Entropy, Entropy change calculation for ideal gas processes. Carnot Cycle & Carnot Efficiency, PMM-2; definition & its impossibility.

Air standard Cycles for IC engines : Otto cycle; plot on P-V, T-S Planes; Thermal Efficiency, Diesel Cycle; Plot on P-V, T-S planes; Thermal efficiency. IC Engine Performance, IC Engine Combustion, IC Engine Cooling & Lubrication.

Rankine cycle of steam : Simple Rankine cycle plot on P-V, T-S, h-s planes, Rankine cycle efficiency with & without pump work. Boilers; Classification; Specification; Fittings & Accessories : Fire Tube & Water Tube Boilers.Air Compressors & their cycles; Refrigeration cycles; Principle of a Refrigeration Plant; Nozzles & Steam Turbines

Fluid Mechanics & Machinery: Properties & Classification of Fluids : ideal & real fluids, Newton’s law of viscosity, Newtonian and Non-Newtonian fluids, compressible and incompressible fluids. Fluid Statics : Pressure at a point.Measurement of Fluid Pressure : Manometers, U-tube, Inclined tube. Fluid Kinematics : Stream line, laminar & turbulent flow, external & internal flow, continuity equation. Dynamics of ideal fluids : Bernoulli’s equation, Total head; Velocity head; Pressure head; Application of Bernoulli’s equitation. Measurement of Flow rate Basic Principles : Venturimeter, Pilot tube, Orifice meter. Hydraulic Turbines: Classifications, Principles. Centrifugal Pumps : Classifications, Principles, Performance.

Production Engineering: Classification of Steels : mild steal & alloy steel, Heat treatment of steel, Welding – Arc Welding, Gas Welding, Resistance Welding, Special Welding Techniques i.e. TIG, MIG, etc. (Brazing & Soldering), Welding Defects & Testing; NDT, Foundry & Casting – methods, defects, different casting processes, Forging, Extrusion, etc, Metal cutting principles, cutting tools, Basic Principles of machining with (i) Lathe (ii) Milling (iii) Drilling (iv) Shaping (v) Grinding, Machines, tools & manufacturing processes.

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Chapter 1Production Engineering ...................1 - 51 1. Metal Casting .............................................................................. 1

2. Welding ....................................................................................... 5

3. Metal Cutting .............................................................................. 9

4. Metal Forming ..........................................................................14

5. Engineering Metrology and Instrumentation ..............15

6. Material Science ......................................................................16

Chapter 2Thermodynamics ..........................52 - 125 1. Basic Concepts & Zeroth Law of Thermodynamics .....52

2. Energy and Energy Interactions ........................................58

3. First Law of Thermodynamics .............................................62

4. Open System Analysis by First Law...................................68

5. Second Law of Thermodynamics ......................................70

6. Entropy .....................................................................................75

7. Properties of Pure Substances ............................................79

Chapter 3Internal Combustion Engine ...... 126 - 169 1. Basics and Air Standard Cycles ........................................ 126

2. Combustion in SI and CI Engines ................................... 134

3. Fuels .................................................................................. 138

4. Ignition, Engine Friction, Lubrication and Cooling .. 140

5. Supercharging, Engine Testing and Emissions .......... 142

Chapter 4Power Plant Engineering .......... 170 - 202

1. Steam Power Plant ............................................................... 170

2. Boilers .................................................................................. 173

3. Steam Turbines ..................................................................... 179

4. Gas Turbine............................................................................. 180

5. Reciprocating Air Compressors....................................... 181

6. Rotary Compressor .............................................................. 182

7. Compressible Fluid Flow & Nozzle ................................. 183

Chapter 5Strength of Materials ................ 203 - 264

1. Properties of Materials ....................................................... 203

2. Simple Stress-strain and Elastic Constants ................. 205

3. Shear Force and Bending Moment ................................ 213

4. Centroids and Moments of Inertia ................................. 217

5. Bending Stress in Beams ................................................... 218

6. Shear Stress in Beams ......................................................... 220

7. Principal Stress-strain and Theories of Failure ........... 220

8. Torsion of Shafts ................................................................... 222

9. Deflection of Beams ............................................................ 225

10. Pressure Vessels .................................................................... 226

11. Theory of Columns .............................................................. 227

12. Theory of Springs ................................................................. 230

ContentsObjective Solved Papers (Paper-I) Mechanical

Engineering

Chapter 8Machine Design ......................... 463 - 493 1. Design against Fluctuating Load ................................... 463

2. Cotter and Knuckle Joint ................................................... 463

3. Welded and Riveted Joint ................................................. 463

4. Threaded Joint and Power Screw ................................... 465

5. Shaft, Key and Coupling .................................................... 466

6. Chain and Belt Drive .......................................................... 467

7. Clutches .................................................................................. 470

8. Design of Gears ..................................................................... 472

9. Bearing .................................................................................. 473

Chapter 9Refrigeration andAir-Conditioning ........................ 494 - 514

Chapter 10Engineering Mechanics ............. 515 - 532 1. System of Forces ................................................................... 515

2. Free Body Diagrams & Equilibrium Equations ........... 516

3. Friction .................................................................................. 519

4. Work and Energy .................................................................. 520

5. Impulse, Momentum and Collision ............................... 521

Chapter 11Heat and Mass Transfer ............. 533 - 543

Chapter 12Miscellaneous ............................ 544 - 570

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Chapter 6Theory of Machines ................... 265 - 315 1. Simple Mechanisms ............................................................ 265

2. Kinematic Analysis of Plane Mechanisms ................... 268

3. Mechanisms with Lower Pairs ......................................... 272

4. CAM Design ........................................................................... 274

5. Friction .................................................................................. 274

6. Gears .................................................................................. 275

7. Dynamics of Machines, Turning Moment, Flywheel .... 278

8. Governors ............................................................................... 282

9. Vibrations ................................................................................ 284

10. Balancing ................................................................................ 285

Chapter 7Fluid Mechanics andFluid Machinery ......................... 316 - 462 1. Fluid Properties ..................................................................... 316

2. Fluid Pressure & its Measurement ................................. 326

3. Hydrostatic Forces on Surfaces ....................................... 330

4. Buoyancy and Floatation .................................................. 332

5. Liquids in Rigid Motion ...................................................... 335

6. Fluid Kinematics ................................................................... 336

7. Fluid Dynamics ..................................................................... 342

8. Flow Measurement .............................................................. 345

9. Flow Through Pipes ............................................................. 350

10. Laminar Flow ......................................................................... 356

11. Turbulent Flow in Pipes ..................................................... 359

12. Dimensional Analysis .......................................................... 360

13. External Flow-Drag and Lift .............................................. 361

14. Impulse of Jets ...................................................................... 363

15. Hydraulic Turbines ............................................................... 363

16. Hydraulic Pumps .................................................................. 371

17. Open Channel Flow, Notches Weiss .............................. 378

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