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.

Answer: Option A

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

Answer: Option E

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.

Answer: Option C

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.

Answer: Option C

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

Answer: Option C

Explanation:

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