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Theory of Structures

Theory of Structures
The point of contraflexure is the point where

S.F. is zero
M. changes sign
M. is minimum
M. is maximum

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Theory of Structures
Principal planes are subjected to

Tangential stresses only
Normal stresses as well as tangential stresses
Normal stresses only
None of these

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Theory of Structures
A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If steel = 0.000012/C°, Esteel = 0.2 MN/mm², the tensile force developed at a temperature of 50°C, is

100 N/mm 2
80 N/mm²
120 N/mm²
150 N/mm²

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Theory of Structures
A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is

2M/ T
T/M
M/T
2T/M

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Theory of Structures
There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of

1 : 1 : 2
2 : 1½ : 1
None of these
1 : 1½ : 2

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Theory of Structures
Flat spiral springs

All of these
Consist of uniform thin strips
Are wound by applying a torque
Consist of uniform thin strips

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