Full-Length Mock Test 8 — RRB JE CBT 2 Technical Abilities Pattern (100 MCQs)

Section A: Engineering Mechanics and Strength of Materials (20 Questions)

1. The centre of percussion of a rigid body is significant in impact analysis because a blow struck there produces:
   (a) No reaction force at the body's pivot/support (b) Maximum reaction force at the pivot (c) Zero angular acceleration of the body (d) Infinite linear acceleration of the body
2. A rigid body's angular momentum about a fixed axis is the product of its moment of inertia and its:
   (a) Angular velocity (b) Linear velocity (c) Linear acceleration (d) Mass alone, with no velocity term
3. The work-energy principle states that the net work done on a body equals its:
   (a) Change in kinetic energy (b) Change in potential energy exclusively (c) Total momentum (d) Total impulse, with no energy relation
4. A rolling body without slipping on a surface has a point of contact with:
   (a) Zero instantaneous velocity relative to the surface (b) Maximum velocity relative to the surface (c) Velocity equal to the body's centre of mass velocity at all times (d) Undefined velocity, as rolling without slipping is not physically possible
5. Curvilinear translation of a rigid body means every point of the body moves along:
   (a) Congruent curved paths, with the body's orientation remaining unchanged (b) Straight lines only, identical to rectilinear translation (c) Circular paths centred at a single fixed pivot (d) Random, unrelated paths for each point on the body
6. The strain energy per unit volume (resilience) of a material loaded within its elastic limit is given by:
   (a) Half the product of stress and strain (b) The product of stress and strain, without the factor of one-half (c) Stress divided by strain, with no product relation (d) The square of the modulus of elasticity
7. A beam's flexural rigidity is the product of its modulus of elasticity and its:
   (a) Moment of inertia (b) Cross-sectional area alone, with no moment of inertia term (c) Length alone (d) Poisson's ratio
8. Torsional rigidity of a shaft is the product of its modulus of rigidity and its:
   (a) Polar moment of inertia (b) Length alone, with no polar moment of inertia term (c) Cross-sectional area alone (d) Young's modulus, combined redundantly
9. A stepped shaft (with different diameters along its length) under torsion has an angle of twist calculated by:
   (a) Summing the individual twist contributions of each uniform segment (b) Using only the largest diameter segment's properties, ignoring all others (c) Using only the smallest diameter segment's properties, ignoring all others (d) Averaging the diameters into a single value with no segment-wise calculation
10. Combined bending and torsion in a shaft is commonly analysed using the concept of equivalent torque, given by a formula involving the:
    (a) Actual bending moment and torque combined via a theory of failure (b) Shaft's colour and surface finish only (c) Shaft's exact manufacturing date only (d) Ambient humidity only, with no relation to the actual loads
11. A curved beam (with significant curvature relative to its cross-sectional depth) has a neutral axis that, unlike a straight beam, is:
    (a) Shifted toward the centre of curvature, not coinciding with the centroidal axis (b) Always exactly coincident with the centroidal axis, identical to a straight beam (c) Located exactly at the outer fibre, with no shift toward the centre of curvature (d) Undefined for any curved beam
12. The theory of pure bending assumes that plane sections of the beam, before bending, remain plane and:
    (a) Perpendicular to the neutral axis after bending (b) Curved and twisted arbitrarily after bending, with no defined relation to the neutral axis (c) Completely detached from the rest of the beam after bending (d) Parallel to the beam's longitudinal axis after bending, with no rotation at all
13. A beam subjected to unsymmetrical bending (loading not aligned with a principal axis) requires resolving the applied load along the:
    (a) Principal axes of the cross-section (b) Beam's exact geometric centre only, with no axis resolution (c) Beam's outer surface only, with no axis resolution (d) Support reactions only, with no relation to the cross-section's axes
14. The product of inertia of a cross-section about a pair of axes is zero if at least one of the axes is a(n):
    (a) Axis of symmetry (b) Axis passing through an arbitrary, non-symmetric point (c) Axis parallel to the neutral axis only, with no symmetry consideration (d) Axis perpendicular to the cross-section's plane
15. A open (thin-walled) section (such as a channel) subjected to transverse loading may experience twisting unless the load passes through the section's:
    (a) Shear centre (b) Exact geometric centroid only, with no distinction from the shear centre (c) Outermost fibre only (d) Neutral axis only, with no relation to the shear centre
16. Buckling load of a column, per Euler's formula, depends on the modulus of elasticity, moment of inertia, and the:
    (a) Effective length of the column (and its end support conditions) (b) Column's exact colour and surface finish (c) Column's manufacturing date (d) Ambient humidity, with no structural relevance
17. A column with both ends pinned has an effective length equal to its:
    (a) Actual length (b) Half of its actual length (c) Twice its actual length (d) One-quarter of its actual length
18. A column with one end fixed and the other free has an effective length equal to:
    (a) Twice its actual length (b) Half of its actual length (c) Its actual length, identical to a pinned-pinned column (d) One-quarter of its actual length
19. Rankine's formula for column design is an empirical approach that provides a more realistic estimate than Euler's formula for columns of:
    (a) Intermediate slenderness (between short and long) (b) Extremely long, slender proportions exclusively (c) Extremely short, stocky proportions exclusively (d) Zero length, with no practical relevance
20. The strain energy method (Castigliano's theorem) can be used to determine the deflection of a structure at a point by differentiating the total strain energy with respect to the:
    (a) Load applied at that point (b) Structure's total weight, with no relation to the applied load (c) Structure's exact manufacturing cost (d) Ambient temperature, with no relation to load or energy

Section B: Thermodynamics, IC Engines, and Power Plant Engineering (20 Questions)

21. The concept of "availability" (exergy) in thermodynamics represents the:
    (a) Maximum useful work obtainable from a system as it comes to equilibrium with its surroundings (b) Total heat content of a system with no relation to work potential (c) Total mass of a system with no relation to energy (d) Minimum possible work required to destroy a system entirely
22. Irreversibility in a thermodynamic process results in:
    (a) Loss of available work (exergy destruction) (b) Gain of available work with no loss whatsoever (c) No effect on the system's work potential (d) Complete elimination of entropy from the universe
23. A perpetual motion machine of the first kind (PMM1) is impossible because it would violate the:
    (a) First Law of Thermodynamics (b) Zeroth Law of Thermodynamics exclusively (c) Ideal gas law exclusively, with no relation to energy conservation (d) Law of conservation of momentum exclusively, with no relation to energy
24. A perpetual motion machine of the second kind (PMM2) is impossible because it would violate the:
    (a) Second Law of Thermodynamics (b) Zeroth Law of Thermodynamics exclusively (c) Ideal gas law exclusively (d) Law of conservation of mass exclusively, with no relation to entropy
25. The Carnot efficiency of a heat engine operating between two given temperatures represents the:
    (a) Maximum possible theoretical efficiency between those temperatures (b) Minimum possible efficiency, with all real engines exceeding it (c) Efficiency independent of the two operating temperatures (d) Efficiency applicable only to refrigeration cycles, never heat engines
26. Air-fuel ratio in an IC engine represents the ratio, by mass, of air to:
    (a) Fuel supplied to the engine (b) Exhaust gas produced (c) Lubricating oil consumed (d) Coolant circulated
27. A stoichiometric (chemically correct) air-fuel mixture provides just enough air for:
    (a) Complete combustion of the fuel, with no excess air or fuel remaining (b) Only partial combustion, with substantial unburnt fuel remaining by design (c) No combustion at all (d) Combustion of only the lubricating oil, with no relation to the fuel
28. A rich air-fuel mixture (relative to stoichiometric) has:
    (a) More fuel (or less air) than the stoichiometric ratio (b) Exactly the stoichiometric ratio, with no deviation (c) Less fuel (or more air) than the stoichiometric ratio (d) No fuel at all, only air
29. A lean air-fuel mixture (relative to stoichiometric) has:
    (a) Less fuel (or more air) than the stoichiometric ratio (b) More fuel (or less air) than the stoichiometric ratio (c) Exactly the stoichiometric ratio, with no deviation (d) No air at all, only fuel
30. Timing of ignition (spark timing) in a petrol engine is set to occur, typically, slightly:
    (a) Before top dead centre, allowing time for combustion to develop (b) After bottom dead centre only, with no relation to top dead centre (c) Exactly at bottom dead centre, with no advance or retard possible (d) Only after the exhaust valve opens, with no relation to compression
31. Valve timing diagrams for IC engines show the precise crank angles at which the:
    (a) Intake and exhaust valves open and close (b) Fuel injector nozzle physically wears out (c) Piston rings are replaced during overhaul (d) Engine's paint is applied during manufacturing
32. A flywheel's moment of inertia in an IC engine application is selected based on the desired limits of:
    (a) Cyclic speed fluctuation (coefficient of fluctuation of speed) (b) Total engine weight only, with no relation to speed fluctuation (c) Engine colour only (d) Fuel cost only, with no relation to speed fluctuation
33. The coefficient of fluctuation of speed of a flywheel-equipped machine is defined as the ratio of the difference between maximum and minimum speed to the:
    (a) Mean speed (b) Maximum speed alone, with no mean speed consideration (c) Minimum speed alone, with no mean speed consideration (d) Total number of cycles completed
34. Turbocharging an IC engine, compared to a naturally aspirated engine of the same displacement, generally results in:
    (a) Increased power output due to greater air (and hence fuel) intake per cycle (b) Decreased power output in every case (c) No change in power output whatsoever (d) Complete elimination of the need for any fuel
35. Intercooling, used alongside turbocharging/supercharging, cools the compressed intake air primarily to:
    (a) Increase its density, further improving the charge mass and reducing knock tendency (b) Decrease its density deliberately, reducing engine power (c) Eliminate the need for any further compression (d) Convert the air into a liquid state before entering the cylinder
36. A hydraulic turbine's efficiency is defined as the ratio of the power developed by the turbine to the:
    (a) Power available in the water supplied to it (b) Power consumed by an unrelated auxiliary pump (c) Power available in the generator's electrical output alone, with no relation to the turbine's mechanical input (d) Power lost in transmission lines downstream of the generator
37. Draft tube used with a reaction turbine (such as a Francis or Kaplan turbine) serves to:
    (a) Recover kinetic energy from the water leaving the runner and allow installation above tailrace level (b) Increase the water's pressure before it reaches the runner (c) Eliminate the need for any runner in the turbine (d) Convert the turbine into an impulse type exclusively
38. A surge tank installed in a hydroelectric power plant's penstock system is used to:
    (a) Absorb pressure fluctuations (water hammer effects) due to sudden load changes (b) Generate additional electrical power directly (c) Replace the need for any turbine (d) Store fuel for a standby diesel generator
39. Water hammer in a pipeline occurs due to:
    (a) Sudden changes in flow velocity, causing pressure surges (b) Steady, unchanging flow with no velocity variation (c) Complete absence of any fluid in the pipeline (d) Only thermal expansion of the pipe material, with no relation to flow
40. A geothermal power plant generates electricity using heat derived from:
    (a) The earth's internal heat (geothermal reservoirs) (b) Nuclear fission exclusively (c) Fossil fuel combustion exclusively (d) Solar radiation exclusively, with no relation to the earth's internal heat

Section C: Theory of Machines and Machine Design (20 Questions)

41. A epicyclic gear train's overall speed ratio can be conveniently analysed using the:
    (a) Tabular (or algebraic) method, tracking arm and gear rotations (b) Colour-coding method exclusively, with no calculation involved (c) Random trial-and-error method exclusively, with no systematic approach (d) Weight-based estimation method exclusively, with no kinematic relation
42. A differential gear mechanism in a vehicle is a specific application of a(n):
    (a) Epicyclic gear train (b) Simple spur gear train exclusively (c) Belt drive exclusively, with no gear involved (d) Chain drive exclusively, with no gear involved
43. The transmission (angle) of force in a mechanism, particularly a four-bar linkage, is important because a transmission angle too far from 90° can lead to:
    (a) Mechanical disadvantage and potential jamming (b) Improved efficiency with no adverse effect (c) Complete elimination of any force transmission issue (d) Increased smoothness with no downside
44. The term "toggle position" in a mechanism refers to a configuration where:
    (a) A small input force can generate a very large output force (mechanical advantage approaching infinity) (b) The mechanism cannot move at all under any force, being permanently locked with zero output capability (c) The output force is always exactly equal to the input force, with no amplification (d) The mechanism operates only in reverse, with no forward motion possible
45. A geneva mechanism is used to convert continuous rotary motion into:
    (a) Intermittent rotary motion (b) Continuous, non-intermittent linear motion (c) Purely oscillatory motion with no rotary component at all (d) No motion at all, being a purely static locking device
46. A ratchet and pawl mechanism is used to permit motion in:
    (a) One direction only, while preventing reverse motion (b) Both directions equally, with no directional preference (c) Neither direction, being a completely static device (d) A direction determined randomly with each cycle
47. The design of a flywheel for a punching press considers the energy required for the punching operation and the flywheel's:
    (a) Permissible speed fluctuation during the operation (b) Exact colour and surface finish (c) Manufacturing date (d) Ambient humidity, with no relation to the punching operation
48. Governors used in engines are broadly classified as centrifugal (using rotating masses and centrifugal force) and:
    (a) Inertia type (using the angular acceleration of the governor system) (b) Purely electrical type exclusively, with no mechanical governor existing (c) Purely magnetic type exclusively, with no mechanical or inertia-based governor existing (d) Purely optical type exclusively, using light sensors only
49. Sensitivity of a governor is defined in terms of the:
    (a) Ratio of speed change to mean speed, for a given range of governor operation (b) Exact colour of the governor's flyweights (c) Manufacturing cost of the governor mechanism (d) Ambient temperature during governor operation, with no relation to speed
50. Isochronous governor operation refers to a theoretical condition where the governor maintains:
    (a) Exactly the same speed for all positions of the flyweights (zero speed variation with load) (b) A continuously increasing speed with no stable equilibrium (c) A continuously decreasing speed with no stable equilibrium (d) No relation whatsoever between speed and flyweight position
51. Hunting of a governor refers to a condition where the governor mechanism:
    (a) Continuously oscillates about the equilibrium position without settling (b) Settles instantly to equilibrium with zero oscillation under all conditions (c) Never moves at all, regardless of speed changes (d) Operates only at exactly zero speed
52. The design of a connecting rod in a reciprocating engine must account for combined axial (buckling) and:
    (a) Bending stresses due to the inertia of its own mass during motion (b) Purely thermal stresses only, with no mechanical loading considered (c) Purely electrical stresses only, with no mechanical loading considered (d) No stress at all, as connecting rods are assumed weightless in design
53. A piston in an IC engine is designed to withstand combined thermal and:
    (a) Mechanical (gas pressure) loading (b) Purely electrical loading, with no thermal or mechanical loading (c) Purely magnetic loading, with no thermal or mechanical loading (d) No loading at all, as pistons are assumed to experience zero stress
54. Piston rings serve primarily to:
    (a) Seal the combustion chamber and control the oil film on the cylinder wall (b) Generate electrical current for the ignition system (c) Replace the need for a crankshaft entirely (d) Serve only a decorative function with no sealing or oil-control role
55. A crankshaft is designed to withstand combined bending and torsional loading arising from:
    (a) The connecting rod forces transmitted through the crank mechanism (b) Purely thermal expansion of the engine block, with no mechanical force involved (c) Purely electrical current flow through the shaft, with no mechanical force involved (d) No loading at all, as crankshafts are assumed weightless and unloaded in design
56. The design of an engine's cylinder liner considers wear resistance and the ability to withstand:
    (a) High temperature and pressure from combustion, along with piston ring friction (b) Only electrical stress, with no thermal or mechanical consideration (c) Only magnetic stress, with no thermal or mechanical consideration (d) No stress at all, as liners are assumed to experience zero load
57. A gasket used between mating engine components (such as the cylinder head and block) primarily serves to:
    (a) Provide a reliable seal against gas/fluid leakage at the joint (b) Increase the joint's electrical conductivity (c) Serve only a decorative function with no sealing role (d) Replace the need for any fasteners at the joint
58. The selection of a fastener (bolt) for a given application considers the applied load, required factor of safety, and the:
    (a) Bolt's material strength and thread specifications (b) Bolt's colour only, with no relation to strength or thread specification (c) Bolt's manufacturing date only (d) Ambient humidity only, with no relation to load or material strength
59. Locking devices for threaded fasteners, such as lock washers or nylon-insert lock nuts, are used to prevent:
    (a) Loosening of the fastener due to vibration (b) Any tightening of the fastener under any condition (c) Complete removal of the fastener under any condition, even with proper tools (d) Corrosion of the fastener exclusively, with no relation to loosening
60. The endurance strength of a component under fatigue loading is generally lower than its strength under static loading, primarily due to the effects of:
    (a) Stress concentration, surface finish, and size, among other factors (b) Only the component's colour, with no relation to stress concentration or surface finish (c) Only the component's manufacturing date, with no relation to loading history (d) Only ambient humidity, with no relation to cyclic loading

Section D: Fluid Mechanics, Manufacturing, Metrology, Heat Transfer, and Material Science (20 Questions)

61. A boundary layer, in the context of viscous fluid flow over a surface, is the thin region near the surface where:
    (a) Velocity varies significantly due to viscous effects, from zero at the surface to the free-stream value (b) Velocity is exactly uniform and equal to the free-stream value throughout, with no variation (c) No fluid motion occurs whatsoever, being a purely static region (d) Only gases exist, with no possibility of a liquid boundary layer
62. Separation of the boundary layer from a solid surface can lead to:
    (a) Increased drag and loss of lift/efficiency on aerodynamic/hydraulic surfaces (b) Complete elimination of drag under all conditions (c) Increased lift with no drag penalty whatsoever (d) No effect at all on the surface's aerodynamic/hydraulic performance
63. Compressible flow analysis becomes important when the fluid velocity approaches a significant fraction of the:
    (a) Local speed of sound (Mach number effects become significant) (b) Local acceleration due to gravity, with no relation to sound speed (c) Local ambient temperature in absolute units directly, with no relation to sound speed (d) Local magnetic field strength, with no relation to sound speed
64. A hydraulic ram pump is a device that uses the energy of a large flow of water falling through a small head to:
    (a) Pump a smaller quantity of water to a greater height, without external power (b) Generate electricity directly, with no pumping function (c) Cool a nearby thermal power plant's condenser exclusively (d) Compress air for pneumatic tools exclusively, with no water pumping function
65. A gear pump, a type of positive displacement pump, moves fluid using the:
    (a) Meshing action of rotating gears trapping and displacing fluid (b) Centrifugal action of a rotating impeller, identical to a centrifugal pump (c) Reciprocating action of a piston, identical to a reciprocating pump (d) Evaporation and condensation of the fluid, with no mechanical displacement
66. Electrochemical machining (ECM) removes material through:
    (a) Controlled anodic dissolution of the workpiece in an electrolyte (b) Direct mechanical cutting with a rotating tool, identical to milling (c) Purely thermal melting from an electric arc, identical to arc welding (d) Purely chemical etching with no electrical current involved
67. Ultrasonic machining removes material primarily through the action of:
    (a) High-frequency vibration of a tool combined with an abrasive slurry (b) Direct mechanical cutting with a rotating tool, identical to conventional milling (c) Purely chemical dissolution with no mechanical vibration involved (d) Purely thermal melting from an external flame source
68. Laser beam machining (LBM) removes material through:
    (a) Localized melting/vaporisation from a highly focused, intense light beam (b) Purely mechanical cutting with a rotating tool, identical to conventional machining (c) Purely chemical dissolution with no thermal effect involved (d) Purely magnetic force, with no thermal or mechanical effect
69. Plasma arc machining/cutting uses a high-temperature ionised gas jet to:
    (a) Melt and blow away material from the workpiece, primarily for cutting electrically conductive materials (b) Cool the workpiece to cryogenic temperatures for brittle fracture (c) Coat the workpiece with a protective, non-conductive layer only, with no cutting function (d) Measure the workpiece's dimensions exclusively, with no material removal
70. A coordinate measuring machine (CMM) is used to measure a component's:
    (a) Dimensional and geometric characteristics with high precision, using a probe traversing multiple axes (b) Only its total weight, with no dimensional measurement capability (c) Only its surface colour, with no dimensional measurement capability (d) Only its electrical conductivity, with no dimensional measurement capability
71. Optical flats, used in precision metrology, exploit the phenomenon of light interference to assess a surface's:
    (a) Flatness (departure from a true flat reference) (b) Colour composition exclusively, with no relation to flatness (c) Hardness exclusively, with no relation to flatness (d) Electrical conductivity exclusively, with no relation to flatness
72. Boiling heat transfer, as occurs in a boiler's evaporator tubes, involves heat transfer at rates generally:
    (a) Much higher than single-phase convection, due to latent heat effects (b) Much lower than single-phase convection in every case (c) Identical to pure radiation heat transfer in every case (d) Identical to pure conduction heat transfer in every case, with no convective or latent contribution
73. Condensation heat transfer, the reverse of boiling, occurs when a vapour contacts a surface that is:
    (a) Below the vapour's saturation temperature (b) Above the vapour's saturation temperature (c) At exactly absolute zero temperature only, with no other condition possible (d) Under vacuum conditions exclusively, with no relation to surface temperature
74. Fins (extended surfaces) are added to a heat transfer surface primarily to:
    (a) Increase the effective surface area, enhancing convective heat transfer (b) Decrease the effective surface area deliberately, reducing heat transfer (c) Eliminate the need for any convective heat transfer entirely (d) Serve only a decorative/structural function with no thermal benefit
75. A material's toughness is generally assessed through tests measuring the energy absorbed during:
    (a) Impact fracture (such as Charpy/Izod tests) (b) Static tensile loading alone, with no impact consideration (c) Pure hydrostatic compression alone, with no impact consideration (d) Thermal expansion alone, with no mechanical loading involved
76. Creep in materials refers to the slow, time-dependent deformation that occurs under a sustained:
    (a) Load at elevated temperature, over a long period (b) Load at cryogenic temperature exclusively, with no relation to elevated temperature (c) Zero-load condition, with no applied stress at all (d) Purely dynamic, high-frequency cyclic load with no sustained component
77. Age hardening (precipitation hardening) is a heat treatment process particularly used for certain:
    (a) Non-ferrous alloys, such as some aluminium alloys (b) Pure ferrous metals exclusively, with no relation to non-ferrous alloys (c) Ceramic materials exclusively, with no relation to metallic alloys (d) Polymeric materials exclusively, with no relation to metallic alloys
78. Shape memory alloys (SMAs), an example of a smart material, can return to a predetermined shape when subjected to:
    (a) A specific temperature change (or other stimulus) (b) No stimulus of any kind, changing shape entirely at random (c) Exposure to visible light exclusively, with no relation to temperature (d) Exposure to sound waves exclusively, with no relation to temperature
79. Nanomaterials, characterised by structural features at the nanometre scale, often exhibit properties that differ from their:
    (a) Bulk (conventional-scale) counterparts of the same composition (b) Gaseous state exclusively, with no relation to their solid bulk form (c) Liquid state exclusively, with no relation to their solid bulk form (d) Plasma state exclusively, with no relation to their solid bulk form
80. Biodegradable and recyclable material considerations in modern engineering design are driven largely by concerns for:
    (a) Environmental sustainability and reduced waste (b) Increasing landfill volume deliberately (c) Eliminating all material recycling processes (d) Maximising non-recoverable resource consumption

Section E: General Awareness, Computer Applications, and Current Affairs (20 Questions)

81. The Indian Space Research Organisation (ISRO) is primarily engaged in:
    (a) Space research and satellite/launch vehicle development (b) Railway rolling stock manufacturing (c) Postal service operations (d) Currency printing operations
82. The full form of "GPS" is:
    (a) Global Positioning System (b) General Purpose Server (c) Ground Position Signal (d) Global Processing Standard
83. In computing, "SSD" (a common storage device) stands for:
    (a) Solid State Drive (b) Static Storage Device (c) Sequential Symbol Disk (d) System Support Device
84. The full form of "ISP" in internet connectivity is:
    (a) Internet Service Provider (b) Internal System Protocol (c) Integrated Server Platform (d) Information Security Protocol
85. A "spreadsheet" formula referencing another worksheet within the same file typically uses which separator between the sheet name and cell reference?
    (a) An exclamation mark (!) (b) A hash sign (#) (c) A percentage sign (%) (d) An ampersand (&)
86. The Council of Architecture (CoA) in India regulates the profession of:
    (a) Architecture (b) Mechanical engineering exclusively, with no relation to architecture (c) Railway operations exclusively (d) Banking services exclusively
87. The Institution of Engineers (India) is a professional body that primarily serves:
    (a) Engineers across various disciplines through professional development and certification (b) Only railway employees, with no relevance to other engineers (c) Only banking sector employees (d) Only postal service employees
88. National Instructional Media Institute (NIMI), relevant to vocational training, develops:
    (a) Instructional and training materials for skill development (b) Only railway safety manuals, with no broader vocational relevance (c) Only banking sector training materials (d) Only postal service training materials
89. The "Skill India" logo/branding is commonly associated with the tagline:
    (a) "Kaushal Bharat, Kushal Bharat" (b) "Digital Bharat, Sashakt Bharat" only, with no relation to skill (c) "Swachh Bharat, Swasth Bharat" only, with no relation to skill (d) "Atmanirbhar Bharat, Samriddh Bharat" only, with no relation to skill
90. The National Career Academy and various ITIs across India fall under the broad administrative umbrella of:
    (a) The Ministry of Skill Development and Entrepreneurship (and related state departments) (b) The Ministry of External Affairs exclusively (c) The Ministry of Home Affairs exclusively (d) The Ministry of Culture exclusively
91. Robotics and automation adoption in Indian manufacturing is often supported through collaboration with academic and research institutions such as the:
    (a) IITs and CSIR laboratories (b) Only foreign universities, with no domestic institutional involvement (c) Only agricultural universities, with no engineering relevance (d) Only medical colleges, with no engineering relevance
92. The "Digital Skill India" and related e-learning platforms aim to provide:
    (a) Online access to skill development and vocational training content (b) Only entertainment streaming content, with no educational relevance (c) Only social media networking features, with no educational relevance (d) Only e-commerce shopping features, with no educational relevance
93. Engineering professional ethics commonly emphasise responsibilities toward:
    (a) Public safety, welfare, and honest professional conduct (b) Maximising personal profit exclusively, with no public welfare consideration (c) Concealment of design flaws exclusively, with no disclosure obligation (d) Avoidance of all professional accountability
94. The "Quality Council of India" (QCI) works to promote:
    (a) Quality standards, accreditation, and assessment across sectors (b) Only currency printing quality, with no broader sectoral relevance (c) Only railway punctuality, with no broader quality relevance (d) Only postal delivery speed, with no broader quality relevance
95. The National Accreditation Board for Testing and Calibration Laboratories (NABL) accredits laboratories for their:
    (a) Testing and calibration competence (b) Railway ticketing efficiency exclusively (c) Currency printing accuracy exclusively (d) Postal sorting speed exclusively
96. Modern industrial safety practice increasingly emphasises a proactive approach known as:
    (a) Hazard identification and risk assessment (HIRA) (b) Reactive-only response, addressing incidents solely after they occur with no prior planning (c) Complete avoidance of any safety planning or documentation (d) Elimination of all safety training programmes
97. The "Make in India" initiative identifies key focus sectors that include, among others:
    (a) Automobiles, electronics, and defence manufacturing (b) Only the handicraft sector, with no relevance to heavy industry (c) Only the agricultural sector, with no relevance to manufacturing (d) Only the tourism sector, with no relevance to manufacturing
98. Engineering graduates in India commonly pursue professional certification/licensure paths that may include bodies such as the:
    (a) Institution of Engineers (India) for chartered engineer status (b) Reserve Bank of India exclusively, with no relevance to engineering certification (c) Election Commission of India exclusively (d) Central Board of Film Certification exclusively
99. The "Startup India Seed Fund Scheme" provides financial support to startups primarily for:
    (a) Proof of concept, prototype development, and market entry (b) Only established, publicly listed large corporations (c) Only foreign-owned companies, with no relevance to domestic startups (d) Only the agricultural commodity trading sector
100. Continuous professional development (CPD) for practising engineers typically involves:
     (a) Ongoing learning and skill updating throughout one's career (b) A single training session completed only once at the start of one's career, with no further requirement (c) Complete cessation of any further learning after graduation (d) Learning restricted only to non-technical, unrelated subjects

Answer Key with Explanations

1.(a) A blow at the centre of percussion produces no reaction at the pivot.

2.(a) Angular momentum = moment of inertia × angular velocity.

3.(a) Work-energy principle: net work = change in kinetic energy.

4.(a) Rolling without slipping: the contact point has zero relative velocity.

5.(a) Curvilinear translation: points move along congruent curved paths, orientation unchanged.

6.(a) Resilience (strain energy/volume) = ½ × stress × strain.

7.(a) Flexural rigidity = E × I.

8.(a) Torsional rigidity = G × J (polar moment of inertia).

9.(a) Stepped shaft twist is the sum of each segment's twist.

10.(a) Combined bending/torsion uses equivalent torque via a failure theory.

11.(a) A curved beam's neutral axis shifts toward the centre of curvature.

12.(a) Pure bending theory assumes plane sections remain plane and perpendicular to the neutral axis.

13.(a) Unsymmetrical bending resolves load along the principal axes.

14.(a) Product of inertia is zero about an axis of symmetry.

15.(a) Load must pass through the shear centre to avoid twisting in open thin-walled sections.

16.(a) Euler buckling load depends on E, I, and effective length.

17.(a) A pinned-pinned column's effective length equals its actual length.

18.(a) A fixed-free column's effective length is twice its actual length.

19.(a) Rankine's formula suits intermediate slenderness columns.

20.(a) Castigliano's theorem: deflection = ∂(strain energy)/∂(load).

21.(a) Availability (exergy) is the max useful work obtainable reaching equilibrium with surroundings.

22.(a) Irreversibility causes loss of available work (exergy destruction).

23.(a) PMM1 violates the First Law.

24.(a) PMM2 violates the Second Law.

25.(a) Carnot efficiency is the maximum theoretical efficiency between two temperatures.

26.(a) Air-fuel ratio = mass of air / mass of fuel.

27.(a) Stoichiometric mixture gives complete combustion with no excess air/fuel.

28.(a) A rich mixture has more fuel (or less air) than stoichiometric.

29.(a) A lean mixture has less fuel (or more air) than stoichiometric.

30.(a) Spark timing is set slightly before TDC.

31.(a) Valve timing diagrams show crank angles for valve opening/closing.

32.(a) Flywheel inertia is selected based on desired speed fluctuation limits.

33.(a) Coefficient of fluctuation of speed = (max−min speed)/mean speed.

34.(a) Turbocharging increases power via greater air/fuel intake per cycle.

35.(a) Intercooling increases density, improving charge mass and reducing knock.

36.(a) Turbine efficiency = power developed / power available in the water supplied.

37.(a) A draft tube recovers kinetic energy and allows above-tailrace installation.

38.(a) A surge tank absorbs water hammer pressure fluctuations.

39.(a) Water hammer arises from sudden flow velocity changes.

40.(a) Geothermal plants use the earth's internal heat.

41.(a) Epicyclic train ratios are analysed via the tabular/algebraic method.

42.(a) A vehicle differential is an epicyclic gear train application.

43.(a) A poor transmission angle causes mechanical disadvantage/jamming risk.

44.(a) A toggle position gives very high mechanical advantage.

45.(a) A Geneva mechanism converts continuous rotation into intermittent rotation.

46.(a) A ratchet and pawl permits motion in one direction only.

47.(a) Flywheel design for a press considers energy needed and permissible speed fluctuation.

48.(a) Governors are centrifugal or inertia type.

49.(a) Governor sensitivity = ratio of speed change to mean speed.

50.(a) Isochronous governors maintain the same speed at all flyweight positions.

51.(a) Hunting is continuous oscillation about equilibrium without settling.

52.(a) Connecting rod design accounts for buckling and inertia-induced bending.

53.(a) Pistons are designed for combined thermal and gas-pressure loading.

54.(a) Piston rings seal the chamber and control the cylinder wall oil film.

55.(a) Crankshafts withstand combined bending/torsion from connecting rod forces.

56.(a) Cylinder liners withstand high temperature/pressure and ring friction.

57.(a) A gasket seals against gas/fluid leakage at a joint.

58.(a) Fastener selection considers load, safety factor, material strength, and thread spec.

59.(a) Locking devices prevent fastener loosening from vibration.

60.(a) Fatigue endurance strength is reduced by stress concentration, surface finish, and size effects.

61.(a) A boundary layer is where viscous effects cause velocity variation near a surface.

62.(a) Boundary layer separation increases drag and reduces lift/efficiency.

63.(a) Compressible flow effects matter as velocity approaches the speed of sound.

64.(a) A hydraulic ram pumps a smaller water quantity to greater height, no external power.

65.(a) A gear pump displaces fluid via meshing gear action.

66.(a) ECM removes material via controlled anodic dissolution.

67.(a) Ultrasonic machining uses tool vibration with abrasive slurry.

68.(a) LBM removes material via focused light beam melting/vaporisation.

69.(a) Plasma arc cutting melts/blows away material using an ionised gas jet.

70.(a) A CMM measures dimensional/geometric features via a multi-axis probe.

71.(a) Optical flats assess flatness via light interference.

72.(a) Boiling heat transfer rates are much higher than single-phase convection.

73.(a) Condensation occurs on a surface below the vapour's saturation temperature.

74.(a) Fins increase effective surface area, enhancing convective heat transfer.

75.(a) Toughness is assessed via impact fracture tests like Charpy/Izod.

76.(a) Creep is slow deformation under sustained load at elevated temperature.

77.(a) Age hardening is used for certain non-ferrous alloys like aluminium.

78.(a) Shape memory alloys return to shape upon a specific stimulus like temperature.

79.(a) Nanomaterials often have properties differing from their bulk counterparts.

80.(a) Biodegradable/recyclable considerations are driven by sustainability concerns.

81.(a) ISRO focuses on space research and satellite/launch vehicle development.

82.(a) GPS stands for Global Positioning System.

83.(a) SSD stands for Solid State Drive.

84.(a) ISP stands for Internet Service Provider.

85.(a) A sheet reference uses "!" between sheet name and cell reference.

86.(a) The Council of Architecture regulates the architecture profession.

87.(a) The Institution of Engineers (India) serves engineers across disciplines.

88.(a) NIMI develops instructional/training materials for skill development.

89.(a) Skill India's tagline is "Kaushal Bharat, Kushal Bharat."

90.(a) ITIs fall under the Ministry of Skill Development and Entrepreneurship.

91.(a) Robotics/automation adoption often involves IITs and CSIR labs.

92.(a) Digital skill platforms provide online vocational training access.

93.(a) Engineering ethics emphasise public safety, welfare, and honest conduct.

94.(a) QCI promotes quality standards/accreditation across sectors.

95.(a) NABL accredits labs for testing/calibration competence.

96.(a) Modern safety practice emphasises proactive HIRA.

97.(a) Make in India focus sectors include automobiles, electronics, defence.

98.(a) Engineers may pursue Institution of Engineers (India) chartered status.

99.(a) The Seed Fund Scheme supports proof of concept/prototype/market entry.

100.(a) CPD involves ongoing learning throughout an engineer's career.