The Mechanicals

Strength of Material Mechanical Properties Hardness ;Resist the penetration (impact  load) Strength : Ability of material withstand of material without failure. Elasticity : It regain the original shape after removing load Plasticity : Permanent deformation after removing load. Mali ability : Converts to thin sheet without rupture Ductility : Draw in to thin wire. Brittleness : No deformation takes place & rupture (lake of ductility ) (cast iron) Toughness : absorb energy & plastic deformation without rupture. Fatigue: by repeatedly applied load program me and localized structure damage that occur. Creep : tendency of solid material to move slowly deform permanently under mechanical stress. Stress : Load applied on particular area.  it is tensor quantity  unit : N/mm2 Strain : Change in length to original length when force applied on body. it has no unit. Strength of Material Tensile : when body is subjected to equal and opposite pull. Compres

Important points of Engineering Mechanics Force = Newton 1 kgf = 9.8 N Process of finding force = Co position Vector method =  Polygon law force Resultant force = sq.root (2P) sigma H = Equilibrium Sigma R = Not Equilibrium Mass Moment of Inertia = kg-m2 Movement of inertia = m4 Important points of Engineering Mechanics Moment of inertia rectangle to width = (1/12)bd3 Moment of inertia rectangle to depth = (1/12)db3 Moment of inertia sphere = (a4)/12 Moment of inertia of circle about diameter = (pi/64)d4 Moment of inertia of circle about axis = (pi/32)d4 Moment of inertia triangle about base = (bh3)/36 Moment of inertia triangle about axis = (bh3)/12 Moment of inertia solid sphere = (2mr2)/5 Ideal machine efficiency = 100% Non reversible machine =  self locking Reversible machine <50% Non reversible machine >50% Screw jack is non reversible machine Low power machine (P) = mW +  c , P=effort , W= Load Maximum advantage lifting machine = (1/m) M

Engineering Mechanics                                                              Branch of engineering science which deals with principle of mechanics and application of engineering problems There 2 types of Mechanics 1. Static mechanics : it Deals with force and there effect which deals at rest. 2. Dynamic mechanics :  it Deals with force and there effect which deals at motion.          in dynamic there are 2 types  Kinetics :  it Deals with force and there effect which deals at motion due to application of force Kinematics :  it Deals with force and there effect which deals at motion without taking in account force which responsible for motion.  Force : it produce or tends to produce , destroy of tends to destroy the motion of body, which acting on body. Resultant force: it can be define by 3 system Parallelogram law of force  Triangle law of force Polygon law of force Co planer force: W hoes line of action lies on the same plane. Concurren

  Limit  fit & Tolerance : Unilateral tolerance :variation is only one direction Bilateral tolerance : variation on both side  Fundamental deviation: basic size Tolerance = upper limit - lower limit :Permissible limit of variation for manufacturing is assigned to parts for manufacturing purpose as boundary of acceptable build.  Basic size : Nominal diameter of shaft or hole it is same for both Fit : it is clearance between two mating parts, it can be determined by whether the parts move, temporary joint  ,permanent joint. Clearance fit : Hole is larger than shaft. Transition fit : Hole is fractionally smaller than shaft. Interference fit : Hole is smaller than shaft. Functional dimension : have to be machined and fit  with other mating parts. Drilling :  unilateral Dimension  BIS (Bureau of International Standard) Grade of Tolerance :18 Fundamental tolerance : 25 BSI (British standard System) Grade of Tolerance :16 Fundamental t

Engineering Drawing Engineering Drawing is an Universal Language of Engineers to transfer Ideas. Here there are lots of Different type of Sketch (projection) you can differentiate. Prospective Projection :approximate  representation view as you see by eye Auxiliary View : use full in dislocation of portion (X-RAY) Orthographic projection : visual ray line , parallel to each other obliq and axonometric view s : 3 view drawing 3 Principle plane Frontal Horizontal Profile Sphere has only ONE VIEW Europe usually use : First angle view Protector : 0.5 Degree Smallest Angle Drafting Scale: Triangle is not available Light Weight pencil : H  Drawing sheet Ration : 1: root2 Elevation = Top view Elevation on Vertical Plane SHEET A5 : 148 X 210 A4 : 210 X 297 A3 : 297 X 420 A2 : 420 X 594 A1 :594  X 841 A0 : 841 X 1189 Letter in Dwg : 7:4 3H,4H Pencil for : Center line PENCIL  IN ORDER : 18   Light Dark 9H,8H,7H,6H,5H,4H,3H,2H,H,F,HB,B,2B,3B,4B,5B,6B

RTO class 3 paper solution Mechanical -GPSC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 https://www.youtube.com/channel/UCTfk_SXHfvxYGuuPvM5Vb2Q

Here is attached RTO class 2 paper solution for mechanical  Circled answer is right one Add caption 20-26 Add caption Add caption Add caption Add caption Add caption Add caption Add caption Add caption Add caption Add caption Add caption Add caption https://www.youtube.com/channel/UCTfk_SXHfvxYGuuPvM5Vb2Q?view_as=subscriber