Full-Length Mock Test 7 — RRB JE CBT 2 Technical Abilities Pattern (100 MCQs)
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Section A: Engineering Mechanics and Strength of Materials (20 Questions)
- The line of action of the resultant of a system of forces passes through a point determined by:
(a) The principle of moments (Varignon's theorem) (b) The centre of the coordinate system only, regardless of force positions (c) Random selection with no defined method (d) The average colour of the force vectors - Varignon's theorem states that the moment of a force about a point equals the:
(a) Sum of the moments of its components about that point (b) Product of the force and the total system mass (c) Difference between the force's magnitude and the system's total weight (d) Force's magnitude divided by the number of components - A truss is an assembly of members connected at joints, primarily designed to carry loads through:
(a) Axial (tension/compression) forces in the members (b) Bending moments exclusively, with no axial force considered (c) Torque exclusively, with no axial or bending consideration (d) Thermal expansion exclusively, with no mechanical load considered - The method of joints, used in truss analysis, applies equilibrium equations at each:
(a) Joint of the truss (b) Individual member's midpoint only, with no joint considered (c) Support reaction point only, ignoring internal joints (d) Random point selected without regard to truss geometry - The method of sections, used in truss analysis, involves cutting the truss and applying equilibrium to a:
(a) Portion of the truss on one side of the cut (b) Single isolated joint only, identical to the method of joints (c) Random, arbitrarily selected external point unrelated to the truss (d) Point outside the truss with no connection to it - Projectile motion analysis typically assumes that the only force acting on the projectile (neglecting air resistance) is:
(a) Gravity (b) Air resistance alone, with gravity neglected (c) Magnetic force (d) Electrical force - The range of a projectile launched at a given speed is maximum when the launch angle (to the horizontal) is:
(a) 45° (b) 0° (c) 90° (d) 30° only, regardless of launch speed - Simple harmonic motion (SHM) is characterised by an acceleration that is:
(a) Proportional to displacement and directed toward the mean position (b) Constant in magnitude and direction at all times (c) Always zero, regardless of displacement (d) Proportional to velocity, not displacement - The time period of a simple pendulum (for small oscillations) depends on its length and the:
(a) Acceleration due to gravity (b) Mass of the pendulum bob (c) Colour of the pendulum string (d) Amplitude of oscillation, for any amplitude - Torsional pendulum oscillations depend on the moment of inertia of the oscillating body and the:
(a) Torsional stiffness of the supporting element (b) Colour of the supporting element (c) Ambient humidity exclusively (d) Mass of the surrounding air exclusively - A cantilever beam's maximum deflection, for a given end point load, occurs at the:
(a) Free end (b) Fixed end (c) Exact midpoint regardless of loading (d) Point of zero shear force only, with no other location possible - Macaulay's method is used in beam analysis primarily to determine:
(a) Deflection and slope, particularly for beams with discontinuous loading (b) Only the beam's total weight (c) Only the beam's material cost (d) Only the beam's manufacturing date - The moment-area method is an alternative technique used to determine beam:
(a) Deflection and slope (b) Material composition (c) Surface finish (d) Manufacturing tolerance - A beam of uniform strength is designed so that the extreme fibre (bending) stress is:
(a) Constant along the length of the beam (b) Zero throughout the entire beam (c) Maximum only at the supports, with no other consideration (d) Infinite at every cross-section - The shear stress distribution across a rectangular beam cross-section is:
(a) Parabolic, maximum at the neutral axis and zero at the extreme fibres (b) Uniform throughout the cross-section (c) Maximum at the extreme fibres and zero at the neutral axis (d) Linear, identical to the bending stress distribution - A thick cylindrical pressure vessel, unlike a thin one, requires analysis accounting for stress variation:
(a) Through the wall thickness (radially) (b) Only along the vessel's length, with no radial variation (c) Only in the circumferential direction, with no radial variation (d) Not at all, as thick vessels experience zero stress - Lame's equations are used in the analysis of:
(a) Thick cylindrical pressure vessels (b) Thin beams under pure bending only (c) Simple trusses only (d) Gear tooth profiles only - The strain energy stored in a shaft under torsion is proportional to the:
(a) Square of the applied torque (for a given shaft geometry) (b) Applied torque directly, with no squared relationship (c) Inverse of the applied torque (d) Cube root of the applied torque - Impact (shock) loading on a member produces stresses that are generally:
(a) Higher than the equivalent static load stress (b) Lower than the equivalent static load stress in every case (c) Identical to static load stress in every case (d) Entirely independent of the load magnitude - The factor by which impact stress exceeds equivalent static stress depends on the ratio of the impact velocity/height to the member's:
(a) Static deflection under an equivalent static load (b) Colour and surface finish only (c) Manufacturing date only (d) Ambient temperature only, with no relation to deflection
Section B: Thermodynamics, IC Engines, and Power Plant Engineering (20 Questions)
- A pure substance, in thermodynamic terms, is one that has:
(a) A homogeneous and invariable chemical composition (b) A constantly varying chemical composition (c) No defined physical state at all (d) Zero mass under all conditions - The triple point of a pure substance is the unique state at which:
(a) Solid, liquid, and vapour phases coexist in equilibrium (b) Only the solid phase exists (c) Only the liquid phase exists (d) The substance has infinite temperature - The critical point of a pure substance is the state beyond which:
(a) Distinct liquid and vapour phases can no longer be distinguished (b) The substance becomes a perfect solid (c) The substance has zero pressure (d) The substance has zero temperature - Dryness fraction (quality) of a wet steam sample represents the:
(a) Mass fraction of vapour present in a liquid-vapour mixture (b) Total mass of the sample (c) Total volume of the sample (d) Temperature of the sample in degrees Celsius - A steam table provides thermodynamic property data (enthalpy, entropy, specific volume, etc.) for water/steam at various:
(a) Pressures and temperatures (b) Colours and textures (c) Manufacturing costs (d) Electrical conductivities - The Mollier diagram (h-s chart) for steam plots enthalpy against:
(a) Entropy (b) Pressure only, with no entropy axis (c) Volume only, with no entropy axis (d) Temperature only, with no entropy axis - A steam turbine converts the thermal/kinetic energy of steam into:
(a) Mechanical (rotational) energy (b) Chemical energy directly (c) Nuclear energy directly (d) Purely electrical energy with no intermediate mechanical stage - An impulse steam turbine develops power primarily through steam:
(a) Striking moving blades after being accelerated through fixed nozzles (b) Expanding directly within the moving blades themselves, with no separate nozzle stage (c) Remaining at constant pressure and velocity throughout the turbine (d) Condensing directly within the turbine casing before reaching any blades - A reaction steam turbine, unlike a pure impulse turbine, has steam expansion occurring:
(a) In both the fixed and moving blades (b) Only in the fixed blades, with no expansion in the moving blades (c) Only in the moving blades, with no expansion in the fixed blades (d) Nowhere within the turbine, as reaction turbines have no expansion at all - Governing of a steam turbine is done primarily to control its:
(a) Speed, in response to load variations (b) Colour, for aesthetic purposes only (c) Weight, with no relation to speed or load (d) Manufacturing cost, with no relation to operational parameters - A condenser in a steam power plant helps improve cycle efficiency primarily by:
(a) Maintaining a low back pressure at the turbine exhaust (b) Increasing the turbine exhaust pressure significantly (c) Eliminating the need for a boiler entirely (d) Reducing the boiler pressure to atmospheric level - Deaeration of boiler feedwater is performed primarily to remove:
(a) Dissolved gases (particularly oxygen) that could cause corrosion (b) All dissolved minerals entirely, with no relation to gases (c) All water content entirely (d) All heat content entirely, cooling the water to freezing - A cyclone separator, used in some boiler/furnace systems, primarily removes:
(a) Particulate matter from a gas stream using centrifugal action (b) Dissolved gases from water (c) Heat from flue gases (d) Moisture from compressed air exclusively, with no relation to particulates - Fluidised bed combustion (FBC) in modern boilers allows the burning of fuel while it is:
(a) Suspended in an upward-flowing stream of air, behaving like a fluid (b) Completely submerged in water with no air contact (c) Frozen solid with no combustion occurring (d) Compressed into a solid block with no air flow at all - A cogeneration (combined heat and power, CHP) plant is designed to simultaneously produce:
(a) Electrical power and useful process heat (b) Only electrical power, with no heat output of any kind (c) Only heat, with no electrical output of any kind (d) Neither electrical power nor heat, only mechanical shaft output - The specific fuel consumption (SFC) of an engine is defined as the fuel consumed per unit:
(a) Power output over a given time (b) Volume of the engine's cylinder (c) Length of the connecting rod (d) Weight of the crankshaft - Emission control technologies in modern IC engines, such as catalytic converters, are used to reduce:
(a) Harmful exhaust pollutants such as CO, NOx, and unburnt hydrocarbons (b) The engine's compression ratio directly (c) The engine's fuel injection timing directly, with no relation to emissions (d) The engine's physical size, with no relation to emissions - Common rail direct injection (CRDI) systems in modern diesel engines allow:
(a) Precise, high-pressure fuel injection independent of engine speed (b) Only carburetion, with no direct injection at all (c) Only mechanical injection timing tied rigidly to engine speed with no independent control (d) Complete elimination of the fuel injector - Electric and hybrid vehicles, as alternatives to conventional IC-engine vehicles, primarily aim to reduce:
(a) Fuel consumption and tailpipe emissions (b) The vehicle's overall weight to exactly zero (c) The need for any wheels or tyres (d) The need for any braking system - Biodiesel, as an alternative fuel, is typically derived from:
(a) Vegetable oils or animal fats, through a transesterification process (b) Crude petroleum exclusively, with no biological source (c) Coal exclusively, with no biological source (d) Natural gas exclusively, with no biological source
Section C: Theory of Machines and Machine Design (20 Questions)
- A cam mechanism's follower motion type (uniform velocity, SHM, uniform acceleration/deceleration, or cycloidal) is chosen based on the desired:
(a) Dynamic characteristics (velocity, acceleration, jerk profile) of the follower (b) Colour of the cam material only, with no relation to motion characteristics (c) Manufacturing date of the cam only (d) Ambient temperature only, with no relation to follower motion - Cycloidal motion, used in some high-speed cam designs, provides the advantage of:
(a) Zero acceleration at the beginning and end of the stroke, reducing shock/vibration (b) Maximum possible acceleration at all points, with no variation (c) Constant velocity throughout, identical to uniform velocity motion (d) No motion at all, being purely a theoretical construct with no practical application - Pressure angle in cam design is the angle between the direction of follower motion and the:
(a) Common normal at the point of contact between cam and follower (b) Cam's axis of rotation exclusively, with no relation to the contact point (c) Follower's colour axis, with no mechanical significance (d) Cam's manufacturing tolerance band - Excessive pressure angle in a cam mechanism can lead to:
(a) Jamming of the follower in its guide, due to excessive side thrust (b) Improved efficiency with no adverse effect at all (c) Complete elimination of any side thrust (d) Increased smoothness with no downside whatsoever - Undercutting of gear teeth, an unwanted manufacturing effect related to interference, weakens the tooth at its:
(a) Root/base (b) Tip only, with no effect at the root (c) Pitch circle exclusively, with no effect elsewhere (d) Outer casing only, unrelated to the tooth itself - Profile shifting (addendum modification) in gear design is used to:
(a) Avoid interference and improve strength without changing the number of teeth (b) Change the gear's colour coding only (c) Eliminate the need for any lubrication (d) Increase the gear's weight with no functional benefit - A herringbone gear, essentially two opposed helical gears, is used primarily to:
(a) Cancel out the axial thrust generated by a single helical gear (b) Increase axial thrust deliberately for a specific application (c) Eliminate all torque transmission capability (d) Serve only a decorative function with no mechanical role - A bevel gear is used to transmit motion between shafts whose axes:
(a) Intersect (typically at right angles) (b) Are always parallel, identical to spur gears (c) Never intersect and are never parallel, existing in a purely theoretical configuration (d) Are coincident (the same axis) at all times - A hypoid gear, commonly used in vehicle rear axles, is used to transmit motion between shafts whose axes:
(a) Are non-intersecting and non-parallel (offset), unlike bevel gears (b) Are always exactly coincident (c) Always intersect at exactly 90°, identical to a standard bevel gear (d) Are always exactly parallel, identical to spur gears - The design of a spur gear tooth for bending strength commonly uses the Lewis equation, which relates tooth load to the:
(a) Tooth form factor, module, and face width (b) Gear's paint colour only (c) Gear's manufacturing date only (d) Ambient humidity only, with no relation to tooth geometry - Dynamic tooth load in gear design, in addition to the static transmitted load, arises due to:
(a) Manufacturing errors and inertia effects at operating speed (b) The gear's colour, with no relation to speed or manufacturing accuracy (c) The gear's exact chemical composition alone, with no relation to speed (d) Zero additional load under any operating condition - A journal bearing's minimum oil film thickness is a critical design parameter to avoid:
(a) Metal-to-metal contact between the shaft and bearing (b) Excessive lubricant supply, with no relation to metal contact (c) Complete absence of any load on the bearing (d) Zero rotational speed of the shaft - Hydrodynamic lubrication in a journal bearing relies on the:
(a) Wedge-shaped oil film generated by the relative motion of the shaft, supporting the load (b) Complete absence of any lubricant film (c) Direct metal-to-metal contact with no separating film (d) External pressurised oil supply exclusively, with no self-generated film - Hydrostatic lubrication, unlike hydrodynamic lubrication, relies on:
(a) An externally pressurised lubricant supply, independent of relative motion (b) Only the relative motion of the surfaces, with no external pressure source (c) No lubricant at all, relying purely on surface finish (d) Air alone, with no liquid lubricant involved - A thrust bearing is specifically designed to carry:
(a) Axial load along the shaft's axis (b) Only radial load, with no axial capacity (c) No load of any kind, serving only an alignment function (d) Only bending moment, with no direct load capacity - The preload applied to a bearing during assembly is used to:
(a) Eliminate internal clearance and improve stiffness/accuracy (b) Increase internal clearance to the maximum possible value (c) Completely eliminate the bearing's load-carrying capacity (d) Serve only a cosmetic function with no mechanical effect - A mechanical seal, used to prevent leakage along a rotating shaft, typically relies on:
(a) A close contact between a rotating and a stationary sealing face (b) Complete absence of any contact between components (c) A rigid, welded joint with no relative motion permitted at all (d) A permanently open gap with no sealing function - An O-ring seal is a simple, widely used sealing element made from a:
(a) Resilient elastomeric material, compressed to prevent leakage (b) Rigid, non-deformable ceramic material only (c) Molten metal poured in place during assembly (d) Loose fabric material with no sealing capability - The design of a pressure vessel considers the vessel's wall thickness based on the internal pressure, diameter, and the:
(a) Material's allowable stress (b) Vessel's paint colour only (c) Vessel's exact manufacturing date only (d) Ambient humidity only, with no relation to pressure or material strength - Non-destructive testing of welded joints in pressure vessels, such as radiography, is performed to detect:
(a) Internal defects such as porosity, cracks, or incomplete fusion (b) Only surface colour variation (c) Only the exact chemical composition of the filler material (d) Only the ambient temperature during welding
Section D: Fluid Mechanics, Manufacturing, Metrology, Heat Transfer, and Material Science (20 Questions)
- Viscosity of a fluid is a measure of its resistance to:
(a) Shear deformation (relative motion between fluid layers) (b) Compression only, with no relation to shear (c) Thermal expansion only (d) Electrical conduction - A Newtonian fluid is one in which shear stress is:
(a) Directly proportional to the rate of shear strain (b) Completely independent of the rate of shear strain (c) Inversely proportional to viscosity, with no relation to shear rate (d) Zero under all conditions regardless of shear rate - Buoyant force on a submerged (or floating) body, per Archimedes' principle, equals the weight of the:
(a) Fluid displaced by the body (b) Body itself, regardless of the fluid displaced (c) Fluid remaining after displacement, with no relation to the displaced volume (d) Container holding the fluid, with no relation to the body - A body floats in a fluid when the buoyant force equals the body's:
(a) Weight (b) Volume, in identical numerical units with no unit conversion (c) Surface area (d) Density, in identical numerical units with no unit conversion - Metacentric height is a key parameter in assessing the:
(a) Stability of a floating body (b) Maximum speed of a flowing fluid (c) Viscosity of a lubricating oil (d) Thermal conductivity of a solid material - A hydraulic press operates on the principle that pressure applied to an enclosed fluid is transmitted:
(a) Equally in all directions, allowing force amplification via differing piston areas (b) Only in the vertical direction, regardless of piston arrangement (c) Only through solid components, with no fluid involved (d) Only when the fluid is a gas, never a liquid - Jigs and fixtures used in manufacturing serve to:
(a) Hold, locate, and guide the workpiece/tool during machining operations (b) Replace the need for any cutting tool entirely (c) Serve only a decorative function on the shop floor (d) Measure the finished component's dimensions exclusively, with no holding function - A jig, more specifically, differs from a fixture primarily in that a jig:
(a) Guides the cutting tool directly (e.g., via bushings), in addition to holding the workpiece (b) Never holds the workpiece under any condition (c) Is used exclusively for inspection, with no machining role (d) Has no defined function distinct from a fixture in any respect - Numerical control (NC) / computer numerical control (CNC) machines are operated based on:
(a) Programmed digital instructions controlling tool motion and machine functions (b) Manual hand-wheel operation exclusively, with no programmed control (c) Purely mechanical cams with no digital or programmed element (d) Random, unguided tool motion with no control system at all - Rapid prototyping (additive manufacturing) techniques build a physical model directly from a:
(a) 3D digital (CAD) model, layer by layer (b) Two-dimensional photograph only, with no 3D model involved (c) Physical master pattern requiring conventional casting exclusively (d) Verbal description alone, with no digital model of any kind - A comparator's magnification (amplification) ratio determines how much a small actual deviation is:
(a) Magnified for easier visual reading (b) Reduced, making small deviations harder to observe (c) Converted into an entirely unrelated physical quantity, such as temperature (d) Eliminated entirely, showing no deviation regardless of actual size - An interferometer, used in advanced metrology, measures extremely small dimensions/deviations using the principle of:
(a) Light wave interference (b) Purely mechanical contact with a stylus (c) Chemical reaction with the surface (d) Magnetic field variation exclusively - The concept of "interchangeability" in manufacturing means that any part from a batch:
(a) Can be assembled with any mating part from a corresponding batch, without additional fitting (b) Must always be custom-fitted individually to its specific mating part (c) Cannot be replaced or substituted under any circumstance (d) Has no defined tolerance or specification at all - Selective assembly is a technique used when extremely tight tolerances are required, by:
(a) Sorting parts into matched groups (by measured size) before assembly (b) Assembling parts entirely at random with no measurement or sorting (c) Rejecting all parts outside a single, impossibly tight tolerance band (d) Ignoring all dimensional variation entirely - The heat transfer coefficient in convection depends on factors including fluid properties, flow velocity, and:
(a) Surface geometry (b) The fluid's exact colour only, with no relation to physical properties (c) The fluid's cost only (d) The fluid's brand name only - A thermocouple, a common temperature measurement device, generates a voltage based on the:
(a) Seebeck effect, from the junction of two dissimilar metals at different temperatures (b) Photovoltaic effect, from light striking a semiconductor (c) Piezoelectric effect, from mechanical stress on a crystal (d) Hall effect, from a magnetic field acting on a current-carrying conductor - A resistance temperature detector (RTD) measures temperature based on the change in a material's:
(a) Electrical resistance with temperature (b) Colour with temperature, using purely visual assessment (c) Magnetic permeability with temperature, exclusively (d) Density with temperature, exclusively via a floating hydrometer - Fatigue testing of materials is conducted to determine their behaviour under:
(a) Repeated, cyclic loading (b) A single, static, unchanging load only (c) Purely thermal cycling with no mechanical load at all (d) Zero load conditions exclusively - Charpy and Izod tests are standard methods used to assess a material's:
(a) Impact toughness (b) Electrical conductivity (c) Thermal conductivity (d) Colour fastness - Hardness testing methods such as Brinell, Rockwell, and Vickers assess a material's resistance to:
(a) Localized indentation/plastic deformation (b) Uniform axial tension to failure (c) Torsional twisting to failure (d) Thermal expansion under heating
Section E: General Awareness, Computer Applications, and Current Affairs (20 Questions)
- The National Testing Agency (NTA) in India primarily conducts:
(a) Various entrance and competitive examinations (b) Railway safety inspections exclusively (c) Currency printing operations exclusively (d) Postal service audits exclusively - The full form of "RAM" in computing is:
(a) Random Access Memory (b) Read Access Module (c) Rapid Application Memory (d) Remote Access Machine - In MS Excel, a formula always begins with which symbol?
(a) = (equals sign) (b) # (hash sign) (c) @ (at sign) (d) & (ampersand) - The full form of "WWW" is:
(a) World Wide Web (b) World Wide Wire (c) Web Wide World (d) Wide World Web - A "hyperlink" in a digital document is used to:
(a) Navigate to another location, document, or webpage when clicked (b) Permanently delete the document (c) Change the document's font colour only (d) Print the document directly with no navigation function - The National Council of Educational Research and Training (NCERT) is primarily involved in:
(a) Curriculum development and educational research (b) Railway ticketing operations (c) Currency printing (d) Postal service regulation - Engineering aptitude and general awareness sections in RRB JE exams commonly test knowledge of national schemes such as:
(a) Make in India, Skill India, and Digital India (b) Only foreign government schemes, with no domestic relevance (c) Only sports tournament schedules (d) Only entertainment industry awards - The Ministry of Heavy Industries in India oversees sectors including:
(a) Capital goods and heavy engineering industries (b) Only agricultural extension services (c) Only postal service operations (d) Only currency printing operations - The Indian Institute of Science (IISc), a premier research institution, is located in:
(a) Bengaluru (b) Chennai (c) Kolkata (d) Mumbai - The National Productivity Council (NPC) in India works to promote:
(a) Productivity improvement across industry and services (b) Only currency exchange rate stability (c) Only railway punctuality metrics (d) Only postal delivery speed - Engineering standards for pressure vessels in India are commonly governed by codes such as:
(a) IS (Indian Standard) codes and international codes like ASME (b) Only informal, unwritten workshop practice (c) Only foreign codes with no Indian standard equivalent (d) Only verbal guidelines with no written code - The Skill India Mission works in coordination with schemes such as:
(a) Pradhan Mantri Kaushal Vikas Yojana (PMKVY) (b) Only foreign scholarship programmes with no domestic scheme (c) Only agricultural subsidy schemes (d) Only currency exchange schemes - The "Design for Manufacturing" (DFM) philosophy in engineering emphasises designing products for:
(a) Ease and economy of manufacture without compromising function (b) Maximum manufacturing difficulty and cost, regardless of function (c) Exclusively artistic appearance, with no manufacturing consideration (d) Exclusively electronic products, with no mechanical relevance - Value engineering in product design aims to achieve the required function at the:
(a) Lowest overall cost, without sacrificing necessary quality/performance (b) Highest possible cost, regardless of function (c) Exclusively through elimination of all product features (d) Exclusively through use of the most expensive materials available - The National Digital Library of India provides free access to:
(a) Educational and research content across disciplines (b) Only entertainment media with no educational content (c) Only government administrative forms (d) Only postal tracking information - Industrial safety regulations in India, relevant to factory workers, are governed by acts such as the:
(a) Factories Act (b) Companies Act exclusively, with no factory-specific provision (c) Banking Regulation Act exclusively (d) Indian Railways Act exclusively - Ergonomics in industrial engineering focuses on designing workspaces and tasks to:
(a) Fit human capabilities, reducing strain and improving efficiency/safety (b) Maximise physical strain on workers deliberately (c) Eliminate the human element entirely from all processes (d) Apply only to office furniture, with no factory relevance - The 5S workplace organisation methodology (Sort, Set in order, Shine, Standardise, Sustain) originated primarily in:
(a) Japanese manufacturing practice (b) European agricultural practice (c) North American postal service practice (d) South American banking practice - Kaizen, a continuous improvement philosophy widely used in manufacturing, emphasises:
(a) Small, incremental improvements involving all employees (b) Large, infrequent, radical changes only, with no incremental component (c) Complete rejection of any improvement effort (d) Improvement efforts restricted only to senior management - The acronym "RRB" in the context of this examination stands for:
(a) Railway Recruitment Board (b) Regional Rural Bank (c) Reserve Reconciliation Bureau (d) Road Regulatory Body
Answer Key with Explanations
1.(a) Varignon's theorem locates the resultant's line of action via the principle of moments.
2.(a) Varignon's theorem: moment of a force = sum of moments of its components.
3.(a) Trusses carry load through axial forces in members.
4.(a) The method of joints applies equilibrium at each joint.
5.(a) The method of sections applies equilibrium to a cut portion of the truss.
6.(a) Projectile motion (ignoring air resistance) is governed by gravity alone.
7.(a) Maximum projectile range occurs at a 45° launch angle.
8.(a) SHM: acceleration proportional to displacement, directed toward mean position.
9.(a) A simple pendulum's period depends on length and g.
10.(a) Torsional pendulum period depends on moment of inertia and torsional stiffness.
11.(a) A cantilever's max deflection under an end load occurs at the free end.
12.(a) Macaulay's method determines deflection/slope for discontinuously loaded beams.
13.(a) The moment-area method determines beam deflection and slope.
14.(a) A beam of uniform strength has constant extreme fibre stress along its length.
15.(a) Rectangular beam shear stress is parabolic, max at neutral axis.
16.(a) Thick cylinder analysis accounts for radial stress variation.
17.(a) Lame's equations analyse thick cylindrical pressure vessels.
18.(a) Torsional strain energy is proportional to torque squared.
19.(a) Impact loading produces higher stress than equivalent static load.
20.(a) Impact stress factor depends on impact height/velocity vs. static deflection.
21.(a) A pure substance has homogeneous, invariable chemical composition.
22.(a) The triple point is where solid, liquid, and vapour coexist.
23.(a) Beyond the critical point, liquid and vapour phases are indistinguishable.
24.(a) Dryness fraction is the vapour mass fraction in a wet steam mixture.
25.(a) Steam tables give properties at various pressures/temperatures.
26.(a) The Mollier diagram plots enthalpy vs. entropy.
27.(a) A steam turbine converts thermal/kinetic energy into mechanical energy.
28.(a) An impulse turbine works via steam striking blades after nozzle acceleration.
29.(a) A reaction turbine has expansion in both fixed and moving blades.
30.(a) Turbine governing controls speed in response to load changes.
31.(a) A condenser improves efficiency by maintaining low turbine back pressure.
32.(a) Deaeration removes dissolved gases (esp. oxygen) to prevent corrosion.
33.(a) A cyclone separator removes particulates via centrifugal action.
34.(a) FBC burns fuel suspended in an upward air stream.
35.(a) Cogeneration produces both electrical power and useful process heat.
36.(a) SFC = fuel consumed per unit power output over time.
37.(a) Catalytic converters reduce harmful exhaust pollutants.
38.(a) CRDI allows precise, high-pressure injection independent of engine speed.
39.(a) Electric/hybrid vehicles aim to reduce fuel consumption and emissions.
40.(a) Biodiesel is derived from vegetable oils/animal fats via transesterification.
41.(a) Cam follower motion type is chosen based on desired dynamic characteristics.
42.(a) Cycloidal motion gives zero acceleration at stroke start/end, reducing shock.
43.(a) Pressure angle is between follower motion direction and the common normal.
44.(a) Excessive pressure angle can jam the follower due to side thrust.
45.(a) Undercutting weakens the gear tooth at its root.
46.(a) Profile shifting avoids interference and improves strength without changing tooth count.
47.(a) Herringbone gears cancel the axial thrust of a single helical gear.
48.(a) Bevel gears transmit motion between intersecting (often perpendicular) shafts.
49.(a) Hypoid gears transmit motion between non-intersecting, offset shaft axes.
50.(a) The Lewis equation relates tooth load to form factor, module, and face width.
51.(a) Dynamic tooth load arises from manufacturing errors and speed-related inertia effects.
52.(a) Minimum oil film thickness avoids metal-to-metal contact.
53.(a) Hydrodynamic lubrication relies on a self-generated wedge-shaped oil film.
54.(a) Hydrostatic lubrication uses an externally pressurised supply.
55.(a) A thrust bearing carries axial load.
56.(a) Bearing preload eliminates clearance, improving stiffness/accuracy.
57.(a) A mechanical seal relies on close contact between rotating/stationary faces.
58.(a) An O-ring is a compressed elastomeric sealing element.
59.(a) Pressure vessel wall thickness depends on pressure, diameter, and allowable stress.
60.(a) Radiography detects internal weld defects like porosity/cracks.
61.(a) Viscosity measures resistance to shear deformation.
62.(a) A Newtonian fluid has shear stress proportional to shear rate.
63.(a) Buoyant force equals the weight of fluid displaced (Archimedes).
64.(a) A body floats when buoyant force equals its weight.
65.(a) Metacentric height assesses floating body stability.
66.(a) A hydraulic press transmits pressure equally, amplifying force via piston area.
67.(a) Jigs/fixtures hold, locate, and guide the workpiece/tool during machining.
68.(a) A jig additionally guides the cutting tool, unlike a plain fixture.
69.(a) NC/CNC machines operate from programmed digital instructions.
70.(a) Rapid prototyping builds models directly from a 3D CAD model, layer by layer.
71.(a) A comparator's magnification ratio enlarges small deviations for reading.
72.(a) An interferometer measures using light wave interference.
73.(a) Interchangeability means any batch part assembles with any mating part without fitting.
74.(a) Selective assembly sorts parts into matched groups before assembly.
75.(a) Convective heat transfer coefficient depends on fluid properties, velocity, and geometry.
76.(a) A thermocouple works via the Seebeck effect.
77.(a) An RTD measures temperature via resistance change.
78.(a) Fatigue testing assesses behaviour under repeated cyclic loading.
79.(a) Charpy/Izod tests assess impact toughness.
80.(a) Hardness tests assess resistance to localized indentation.
81.(a) NTA conducts various entrance/competitive examinations.
82.(a) RAM stands for Random Access Memory.
83.(a) Excel formulas begin with an equals sign.
84.(a) WWW stands for World Wide Web.
85.(a) A hyperlink navigates to another location/document/webpage.
86.(a) NCERT handles curriculum development and educational research.
87.(a) RRB JE GA sections cover schemes like Make in India, Skill India, Digital India.
88.(a) The Ministry of Heavy Industries oversees capital goods/heavy engineering.
89.(a) IISc is located in Bengaluru.
90.(a) NPC promotes productivity improvement across industry/services.
91.(a) Pressure vessel codes include IS codes and international codes like ASME.
92.(a) Skill India works with schemes like PMKVY.
93.(a) DFM emphasises ease/economy of manufacture without compromising function.
94.(a) Value engineering achieves function at lowest cost without sacrificing quality.
95.(a) The National Digital Library provides free access to educational/research content.
96.(a) Industrial safety is governed by acts like the Factories Act.
97.(a) Ergonomics designs workspaces/tasks to fit human capabilities.
98.(a) The 5S methodology originated in Japanese manufacturing practice.
99.(a) Kaizen emphasises small, incremental improvements involving all employees.
100.(a) RRB stands for Railway Recruitment Board.