- A. 411 N mm
- B. 511 N mm
- C. 611 N mm
- D. 711 N mm
Theory of Structures
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A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm², the bending strain energy stored in the bar, is_____.
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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 locus of reaction of a two hinged semi-circular arch, is_____.
- A. Straight line
- B. Parabola
- C. Circle
- D. Hyperbola
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For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is_____.
- A. 0.303
- B. 0.404
- C. 0.505
- D. 0.707
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If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span,_____.
- A. Horizontal thrust is wl2/8h
- B. S.F. will be zero throughout
- C. B.M. will be zero throughout
- D. All the above
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A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is_____.
- A. 4WD²n/d4N
- B. 4W²Dn/d4N
- C. 4W²D3n/d4N
- D. 4W²D3n²/d4N
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A square column carries a load P at the centroid of one of the quarters of the square. If a is the side of the main square, the combined bending stress will be_____.
- A. p/a²
- B. 2p/a²
- C. 3p/a²
- D. 4p/a²
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A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm² is:
- A. 4.0 mm
- B. 4.5 mm
- C. 5.0 mm
- D. 5.5 mm
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The area of the core of a column of cross sectional area A, is_____.
- A. (1/3) A
- B. (1/6) A
- C. (1/12) A
- D. (1/18) A
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H V are the algebraic sums of the forces resolved horizontally and vertically respectively, M is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon_____.
- A. H = 0
- B. V = 0
- C. M = 0
- D. All the above