121. A short column of external diameter of 250 mm and internal diameter of 150 mm carries an eccentric load of 1000 kN. The greatest eccentricity which the load can have without producing tension anywhere is 42.5
122. The core of a rectangular section with sides b and d is a
123. A reinforced cement concrete footing as shown in Fig. 10.9 carries a concentrated load at P so as to produce maximum
bending stresses due to eccentricities about x-x axis and y-y axis as 100 kN/m²
and 150 kN/m² respectively. If the direct stress due to loading is 175 kN/m² (com
pressive), then the intensity of resultant stress at corner B will be
125 kN/m² compressive
124. The ratio of intensity of stress in case of a suddenly applied load to that in case of a gradually applied load is 2
125. Proof resilience is the maximum energy stored at elastic limit
126. Strain energy stored in a member is given by 0.5 x stress x strain x volume
127. A rectangular block of size 200 mm x 100 mm x 50 mm is subjected to a shear stress of 100 N/mm². If modulus of rigidity of material is 1 x 105 N/mm², strain energy stored will be 50 Nm
128.A steel rod of cross sectional area equal to 1000 mm² is 5 m long. If a pull of 100 kN is suddenly applied to it, then the maximum stress intensity will be 200N/mm²
129.Two circular bars A and B of same material and same length are of diameters
DA and DB respectively. The bars are subjected to the same torque T. The ratio
of strain energies stored in the bars A and B is proportional to
130.Two identical bars, one simply supported and other fixed at ends, are acted upon by equal loads applied at the midpoints. The ratio of strain energy stored in the simply supported beam and the fixed ended beam is 4
131.If the depth of a beam of rectangular section is reduced to half, strain energy
stored in the beam becomes 8 times
132.The system which is shown in Fig consists of two prismatic bars of same
length L and same axial rigidity AE
The system lies in the vertical plane and carries a vertical load P at joint X, The
vertical deflection of joint X is 2PL/AE
133.The specimen in a Charpy impact test is supported as a simply supported beam
134.Impact test enables one to estimate the property of toughness
135.The phenomenon of decreased resistance of a material to reversal of stress is called fatigue
136.The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as creep
137. The stress below which a material has a high probability of not failing under
reversal of stress is known as endurance limit
138. A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will
decrease definitely
139. For ductile materials, the most appropriate failure theory is
maximum shear stress theory
140. At a point in a steel member, the major principal stress is 2000 kg/cm² and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500
kg/cm², then the magnitude of the minor principal stress at which yielding will
commence, according to the maximum shearing stress theory, is 500 kg/cm²