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Junior Engineer
SSC-JEStaff Selection Commission
Mechanical Engineering
Previous Years Solved Papers (2007–2019)
www.madeeasypublications.org
Publications
Also useful for State Service Examinations
and other Competitive Examinations
Conventional Solved Questions
MADE EASY PUBLICATIONS has taken due care in collecting the data and providing the solutions, before publishing this book. Inspite of this, if any inaccuracy or printing error occurs then MADE EASY PUBLICATIONS owes no responsibility. MADE EASY PUBLICATIONS will be grateful if you could point out any such error. Your suggestions will be appreciated.
© All rights reserved by MADE EASY PUBLICATIONS. No part of this book may be reproduced or utilized in any form without the written permission from the publisher.
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SSC-Junior Engineer : Mechanical Engineering Previous Year Conventional 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.
In the fourth edition, the book has been thoroughly revised and Reasoning-Aptitude section is also added. 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. I hope this book
will prove as an important tool to succeed in SSC-JE and other competitive exams. 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 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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ContentsConventional Solved Papers (Paper-II) Mechanical
Engineering
Chapter 1Thermodynamics ..................................... 1
1. Basic Concepts & Zeroth Law of Thermodynamics ....... 1
2. Energy and Energy Interactions .......................................... 2
3. First Law of Thermodynamics ............................................... 3
4. Open System Analysis by First Law..................................... 7
5. Second Law of Thermodynamics ........................................ 8
6. Properties of Pure Substances ............................................18
Chapter 2Power Plant Engineering ......................23
1. Steam Power Plant ..................................................................23
2. Boilers .....................................................................................26
3. Steam Turbines ........................................................................31
4. Gas Turbine................................................................................31
5. Reciprocating Air Compressors..........................................34
Chapter 3Internal Combustion Engine s................36
1. Basics and Air Standard Cycles ...........................................36
2. Combustion in SI and CI Engines ......................................54
3. Ignition, Engine Friction, Lubrication
and Cooling ...............................................................................54
Chapter 4Strength of Materials ............................58 1. Properties of Materials ..........................................................58
2. Simple Stress-strain and Elastic Constants ....................60
3. Shear Force and Bending Moment ...................................64
4. Bending Stress in Beams ......................................................68
5. Shear Stress in Beams ............................................................69
6. Torsion of Shafts ......................................................................70
7. Deflection of Beams ...............................................................75
8. Pressure Vessels .......................................................................76
9. Theory of Columns .................................................................79
Chapter 5Theory of Machines ...............................80 1. Simple Mechanisms ...............................................................80
2. Mechanisms with Lower Pairs ............................................83
3. Cam Design ...............................................................................84
4. Gears .....................................................................................87
5. Dynamics of Machines, Turning Moment, Flywheel .......98
6. Governors ............................................................................... 100
Chapter 6Production Engineering ......................104 1. Metal Casting ......................................................................... 104
2. Welding .................................................................................. 111
3. Metal Cutting ......................................................................... 121
4. Metal Forming ....................................................................... 140
5. Machine Tools ........................................................................ 141
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Chapter 7Engineering Mechanics .......................143 1. System of forces .................................................................... 143
2. Friction .................................................................................. 145
Chapter 8Fluid Mechanics & Fluid Machinery ...148 1. Fluid Properties ..................................................................... 148
2. Fluid Pressure & its Measurement ................................. 150
3. Hydrostatic Forces on Surfaces ....................................... 153
4. Fluid Kinematics ................................................................... 154
5. Fluid Dynamics ..................................................................... 157
6. Flow Measurement .............................................................. 164
7. Flow Through Pipes ............................................................. 168
8. Impulse of Jets ...................................................................... 169
9. Hydraulic Turbines ............................................................... 171
10. Hydraulic Pumps .................................................................. 178
Chapter 9Machine Design ...................................184 1. Chain and Belt Drive .......................................................... 184
2. Clutches .................................................................................. 185
3. Gear........... ................................................................................ 187
4. Bearing .................................................................................. 187
Chapter 10Refrigeration and Air-Conditioning ...190 1. Vapour Compression Refrigeration
System (VCRS) ....................................................................... 190
Chapter 11Material Science ...................................194 1. Heat Treatment of Steels ................................................... 194
2. Properties & Application of Various Ferrous
& Non-ferrous Metals and Their Alloys ......................... 196