Stress may be expressed in Newtons
A. Per millimetre square (N/mm2 )
B. Per centimetre square (N/cm2 )
C. Per metre square (N/m2 )
D. None of these
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Pick up the correct statement from the following:
A. For channels, the shear centre does not coincide its centroid
B. The point of intersection of the bending axis with the cross section of the beam, is called shear centre
C. For I sections, the shear centre coincides with the centroid of the cross section of the beam
D. All the above
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The locus of the moment of inertia about inclined axes to the principal axis, is
A. Straight line
B. Parabola
C. Circle
D. Ellipse
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The point of contraflexure is the point where
A. B.M. changes sign
B. B.M. is maximum
C. B.M. is minimum
D. S.F. is zero
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A lift of weight W is lifted by a rope with an acceleration f. If the area of cross-section of the rope is A, the stress in the rope is
A. A W ( 1 + g f )
B. A ( 1 − f g )
C. A W ( 2 + g f )
D. A W ( 2 + f g )
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If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 × 105 N/mm2 ) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm2 , the angle of twist in radians, is
A. 0.001
B. 0.002
C. 0.0025
D. 0.003
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The ratio of shear stress and shear strain of an elastic material, is
A. Modulus of Rigidity
B. Shear Modulus
C. Modulus of Elasticity
D. Both A and B
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A steel plate d × b is sandwiched rigidly between two timber joists each D × B/2 in section. The moment of resistance of the beam for the same maximum permissible stress σ in timber and steel will be (where Young's modulus of steel is m times that of the timber).
A. σ ( 6 D B D 2 + mb d 2 )
B. σ ( 6 D B D 3 + mb d 3 )
C. σ ( 4 D B D 2 + mb d 3 )
D. σ ( 4 D B D 2 + mb d 2 )
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An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is
A. h Wa
B. 2 h Wa
C. ha 2 W
D. Wa 2 h
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A spring of mean radius 40 mm contains 8 action coils of steel (N = 80000 N/mm2 ), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is
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The equation of a parabolic arch of span l and rise h, is given by
A. y = l 2 h × ( 1 − x )
B. y = l 2 2 h × ( 1 − x )
C. y = l 2 3 h × ( 1 − x )
D. y = l 2 4 h × ( 1 − x )
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The equivalent length of a column of length L having one end fixed and the other end free, is
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Pick up the correct statement from the following:
A. A wire wound in spiral form, is called a helical spring
B. The pitch of a close coil spring, is very small
C. The angle made by the coil with horizontal, is called the angle of helix
D. All the above
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The area of the core of a column of cross sectional area A, is
A. 3 1 A
B. 6 1 A
C. 12 1 A
D. 18 1 A
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The strain energy stored in a spring when subjected to greatest load without being permanently distorted, is called
A. Stiffness
B. Proof resilience
C. Proof stress
D. Proof load
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The greatest load which a spring can carry without getting permanently distorted, is called
A. Stiffness
B. Proof resilience
C. Proof stress
D. Proof load
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Pick up the correct statement from the following:
A. Hoop strain of the walls of a cylinder due to liquid is 2 tE pd [ 1 − 2 m 1 ]
B. Longitudinal strain in the walls of a cylinder due to liquid is 2 tE pd [ 2 1 − m 1 ]
C. Volumetric change in the cylinder due to liquid is 2 tE pd [ 2 5 − m 2 ]
D. All the above
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A shaft rotating N.R.M. under a torque T, transmits a power
A. 30 T π N Newton metres/sec
B. 30 T π N Newton metres/min
C. 60 T π N Newton metres/min
D. 60 T π N Newton metres/sec
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A shaft subjected to a bending moment M and a torque T, experiences
A. Maximum bending stress = π d 3 32 M
B. Maximum shear stress = π d 3 16 T
C. Both A and B
D. Neither A nor B
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The strain energy due to volumetric strain
A. Is directly proportional to the volume
B. Is directly proportional to the square of exerted pressure
C. Is inversely proportional to Bulk modulus
D. All the above
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