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STRENGTH OF MATERIALS ECET PAPERS ECET PAPERS FOR 'S.M' FOR THE YEARS  2013-2015  ARE AVAILABLE HERE FOR FREE. ECET PAPER FOR 2013 :  1. Hooks law holds good upto     (a) Yield point                               (b) Proportional limit     (c) Elastic point                             (d) Plastic limit 2. The value of Poisson's ratio always     (a) Less than one                          (b) Greater than one     (c) Equal to one                            (d) Can be anything 3. For a simply supported beam of span '1' subjected to a moment 'M' at the left support, the bending diagram will be                                          (a) Trapezium       (b) Parabola           (c) Rectangle    (d) Triangle 4. For a cantilever beam of span 6m subjected to a concentrated load 1 kN-m at the free end, the bending moment at the fixed end in anticlock wise        (a) zero                 (b) 3 kN-m            (c) 1 kN-m        (d)

SHEAR STRESS IN BEAMS SHEAR FORCE :              GENERALLY  IT IS THE FORCE APPLIED ON A BODY  TANGENTIAL TO THE SURFACE OF THE BODY.             THE SHEAR FORCE HAS TWO FORCE COMPONENTS EQUAL IN MAGNITUDE ,OPPOSITE IN DIRECTION AND ARE IN DIFFERENT LINE OF ACTION.             SHEAR FORCE TENDS TO ROTATE THE BODY AS IT HAS TWO COMPONENTS IN OPPOSITE DIRECTIONS.IF THE BODY IS IN EQUILIBRIUM THEN  IT IS SUBJECTED TO A COMPLIMENTARY FORCE COUPLE OPPOSITE IN DIRECTION TO THE MAIN SHEAR FORCE COUPLE. SHEAR STRESS   :                 IT IS THE STRESS PRODUCED IN A BEAM DUE TO THE SHEAR FORCE APPLIED ON THE BEAM EXTERNALLY, i.e,. THE TRANSVERSE FORCES(LOADS). ASSUMPTIONS MADE IN DERIVING THE SHEAR STRESS EQUATION : TRANSVERSE SECTIONS REMAIN PLANE UNDER THE ACTION OF BENDING MOMENT AND SHEAR FORCE. THE SHEARING STRESS IS UNIFORMLY DISTRIBUTED OVER THE WIDTH OF THE STRIP UNDER CONSIDERATION. THE STRIP OF WIDTH CONSIDERED,REMAIN FLAT AND ANTI-ELASTIC CURVATURE IS

STRENGTH OF MATERIALS ECET PAPERS  ECET PAPERS FOR ' S.M'  FOR THE YEARS   2010 - 2012  ARE AVAILABLE HERE FOR FREE . ECET PAPER FOR 2010   1.  Poisson's ratio is the ratio of       (a) Lateral strain to linear strain       (b) Linear strain to lateral strain       (c) Bulk modulus to Young's modulus       (d) Young's modulus to rigidity modulus  2.    The ratio of shear stress to shear strain within elastic limit is called       (a) Young's modulus                       (b) Modulus of rigidity       (c) Bulk modulus                            (d) Modulus of resistance  3.    The relation between modulus of elasticity (E), modulus of rigidity (G) and  Poisson's ratio is given by                                           (a) E = 2G(1 + IA)                        (b) E = 2G(1 - p.)       (c) E = G(1 - g)                              (d) E = 2G(1 + 2g)  4.    The maximum value of Poisson's ratio for any material is    

SIMPLE BENDING WHAT IS SIMPLE BENDING ? THE BENDING OF A BEAM WITH CONSTANT BENDING MOMENT AND COMPLETELY FREE FROM SHEAR FORCE IS CALLED " SIMPLE BENDING ".IT IS ALSO CALLED AS " PURE BENDING ". THE STRESSES DEVELOPED IN THE BEAM ARE ONLY DUE TO THE BENDING MOMENT INDUCED ON THE BEAM. THE BENDING MOMENT IN THE B.M.D (BENDING MOMENT DIAGRAM) IS SHOWN BY A STRAIGHT HORIZONTAL LINE. THE SHEAR FORCE IN THE S.F.D (SHEAR FORCE DIAGRAM) IS ZERO WHERE THE SIMPLE BENDING OCCURS. ASSUMPTIONS THE BEAM IS INITIALLY STRAIGHT BEFORE THE APPLICATION OF LOADS ON IT. THE BEAM MATERIAL IS HOMOGENEOUS AND ISOTROPIC (SAME PROPERTIES IN ALL DIRECTIONS). ELASTIC LIMIT OF THE BEAM IS NOT EXCEEDED. TRANSVERSE SECTIONS WILL REMAIN PLAIN BEFORE AND AFTER BENDING. EACH LAYER OF THE BEAM IS FREE TO EXPAND / CONTRACT WITH RESPECT TO THE ADJACENT LAYER. THE VALUE OF YOUNG'S MODULUS OF THE MATERIAL IS SAME IN TENSION AND COMPRESSION. THE B