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Theory of Structures

Theory of Structures
The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is

1/8
1/16
1/10
1/12

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Theory of Structures
For the close coil helical spring of the maximum deflection is

2WD3n/d4N
8WD3n/d4N
WD3n/d4N
4W²D3n/d4N

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Theory of Structures
Maximum principal stress theory for the failure of a material at elastic point, is known

St. Venant's theory
Von Mises' theory
Rankine's theory
Guest's or Trecas' theory

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Theory of Structures
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/mm 2, the angle of twist in radians, is

0.001
0.003
0.0025
0.002

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Theory of Structures
For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D’. Distances AD, DD’ and AD’ when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is

90°
60°
45°
30°

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Theory of Structures
The strain energy stored in a spring when subjected to greatest load without being permanently distorted, is called

Stiffness
Proof resilience
Proof load
Proof stress

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