Q. 21 The greatest eccentricity which a load W can have without producing tension on the cross-section of a short column of external diameter D and internal diameter d, is
A.(D² + d²)/8D
B. 4W/ (D²π – d²)
C. (D² – d²)/32D
D. (D² – d²)/8D
A.(D² + d²)/8D
Q. 22 Center of gravity of a thin hollow cone lies on the axis at a height of
A. One-half of the total height above base
B. One-fourth of the total height above base
C. One-third of the total height above base
D. Three-eighth of the total height above the base
C. One-third of the total height above base
Q. 23 A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is
A. bh²/6
B. b²h/6
C. bh3/12
D. None of these
B. b²h/6
Q. 24 A beam is said to be of uniform strength, if
A. Bending stress is same at every section along its longitudinal axis
B. Deflection is same throughout the beam
C. B.M. is same throughout the beam
D. Shear stress is same throughout the beam
A. Bending stress is same at every section along its longitudinal axis
Q. 25 The coefficient of friction depends on
A. Strength of surfaces
B. Area of contact
C. Shape of surfaces
D. Nature of surface
D. Nature of surface
Q. 26 A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. 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
A. WR/Ï€3
B. 2WR/Ï€3
C. 4WR/Ï€2
D. WR/Ï€3
B. 2WR/Ï€3
Q. 27 The intensity of direct longitudinal stress in the cross-section at any point distant r from the neutral axis, is proportional to
A. r2
B. r
C. 1/r
D. 1/r²
B. r
Q. 28 The coefficient of friction depends upon
A. Shape of the surfaces
B. Nature of surfaces
C. Area of contact
D. All of the above
B. Nature of surfaces
Q. 29 The force in member U2L2 of the truss shown in below figure, is
A. 10 T compression
B. 10 T tension
C. Zero
D. 15 T compression
A. 10 T compression
Q. 30 The ratio of the moments of resistance of a solid circular shaft of diameter D and a hollow shaft (external diameter D and internal diameter d), is
A. D3/(D3 – d3)
B. D4/(D4 – d4)
C. (D4 – d4)/D4
D. (D3 – d3)/D3
B. D4/(D4 – d4)
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