০০। A 8 metre long simply supported rectangular beam which carries a distributed load 45 kg/m. experiences a maximum fibre stress 160 kg/cm2. If the moment of inertia of the beam is 640 cm4, the overall depth of the beam is
ক) 10 cm
খ) 12 cm
গ) 15 cm
ঘ) 16 cm
ঙ) 18 cm.
০১। A beam is said to be of uniform strength, if
ক) B.M. is same throughout the beam
খ) deflection is same throughout the beam
গ) bending stress is same throughout the beam
ঘ) shear stress is same throughout the beam
ঙ) none of these.
০২। A beam is said to be of uniform strength, if
ক) B.M. is same throughout the beam
খ) shear stress is same throughout the beam
গ) deflection is same throughout the beam
ঘ) bending stress is same at every section along its longitudinal axis.
০৩। A beam of length L is pinned at both ends and is subjected to a concentrated bending couple of moment M at its centre. The maximum bending moment in the beam is
ক) M
খ) M/2
গ) M/3
ঘ) ML/2
০৪। A beam of length L supported on two intermediate rollers carries a uniformly distributed load on its entire length. If sagging B.M. and hogging B.M. of the beam are equal, the length of each overhang, is
ক) 0.107 L
খ) 0.207 L
গ) 0.307 L
ঘ) 0.407 L
ঙ) 0.5 L.
০৫। A bending moment may be defined as :
ক) Arithmetic sum of the moments of all the forces on either side of the section
খ) Arithmetic sum of the forces on either side of the section
গ) Algebraic sum of the moments of all the forces on either side of the section
ঘ) None of these.
০৬। A cantilever beam rectangular in cross-section is subjected to an isolated load at its free end. If the width of the beam is doubled, the deflection of the free end will be changed in the ratio of
ক) 8
খ) 1/8
গ) 1/2
ঘ) 2
ঙ) 3
০৭। A cantilever carries is uniformly distributed load W over its whole length and a force W acts at its free end upward. The net deflection of the free end will be
ক) zero
খ) upward
গ) downward
ঘ) none of these.
০৮। A cantilever carrying a uniformly distributed load W over its full length is propped at its free end such that it is at the level of the fixed end. The bending moment will be zero at its free end also at
ক) mid point of the cantilever
খ) fixed point of the cantilever
গ) 1/4th length from free end
ঘ) 3/4th length from free end
ঙ) half length from free end.
০৯। A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
ক) h/4
খ) h/3
গ) h/2
ঘ) 2/3 h.
১০। A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is
ক)
খ)
গ)
ঘ)
১১। A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is
ক)
খ)
গ)
ঘ)
১২। A column is said to be of medium size if its slenderness ratio is between
ক) 20 and 32
খ) 32 and 120
গ) 120 and 160
ঘ) 160 and 180
ঙ) 180 and 200
১৩। A composite member shown in below figure was formed at 25°C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated upto 45°C, then
ক) a will be in tension and b in compression
খ) both will be in compression
গ) both will be in tension
ঘ) a will be in compression and b in tension.
১৪। A cylinder is said to be thin if the ratio of its thickness and diameter, is less than
ক) 1/25
খ) 1/20
গ) 1/15
ঘ) 1/10
ঙ) 1/5
১৫। A diagram which shows the variations of the axial load for all sections of the span of a beam, is called
ক) bending moment diagram
খ) shear force diagram
গ) thrust diagram
ঘ) stress diagram
ঙ) none of these.
১৬। A joint of a frame is subjected to three tensile force P, Q and R equally inclined to each other. If P is 10 tonnes, the other forces will be
ক) Q = 10 tonnes and R = zero
খ) R + 10 tonnes and Q = zero
গ) Q + R = 10 tonnes
ঘ) Q - R = zero
ঙ) Q and R each is equal to 10 tonnes.
১৭। A long vertical member, subjected to an axial compressive load, is called
ক) a column
খ) a strut
গ) a tie
ঘ) a stanchion
ঙ) all the above.
১৮। A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be
ক) 3°
খ) 45°
গ) 60°
ঘ) 90°
ঙ) 120°
১৯। A member which does not regain its original shape after removed of load producing deformation is said