# Civil Engineering - Theory of Structures

### Exercise :: Theory of Structures - Section 1

36.

Two bars, one of steel and the other of copper having areas of cross-sections As and Ac, coefficient of expansion αs and αc and Young's Modulii Es and Es are rigidly connected together at the ends and subjected to temperature change of t°. If the length of the bars initially is L, the final extension δ of the two bars at t° temperature is given by

 A. B. C. D. Explanation:

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37.

The tangential component of stress on an plane inclined θ° to the direction of the force, may be obtained by multiplying the normal stress by

 A. sin θ B. cos θ C. tan θ D. sin θ cos θ E. sin2θ

Explanation:

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38.

The force in AD of the truss shown in given figure, is A. 4.0t compression B. 3.0t compression C. 0.5t compression D. 0.5t tension E. zero.

Explanation:

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39.

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

 A. 1 : 1 1/2 : 2 B. 2 : 1 1/2 : 1 C. 1 : 1 : 2 D. none of these.

Explanation:

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40.

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

 A. 25 N B. 30 N C. 35 N D. 40 N