# Civil Engineering - Theory of Structures

Exercise : Theory of Structures - Section 2
21.
For permissible shear stress fs, the torque transmitted by a thin tube of mean diameter D and wall thickness t, is
πD2t fs
Explanation:
No answer description is available. Let's discuss.

22.
A compound bar consists of two bars of equal length. Steel bar cross-section is 3500 mm2 and that of brass bar is 3000 mm2. These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm2 and Eb = 0.1 MN/mm2, the stresses developed are:
σb = 10 N/mm2, σs = 20 N/mm2
σb = 8 N/mm2, σs = 16 N/mm2
σb = 6 N/mm2, σs = 12 N/mm2
σb = 5 N/mm2, σs = 10 N/mm2
Explanation:
No answer description is available. Let's discuss.

23.
is the equation for Euler's crippling load if
both the ends are fixed
both the ends are hinged
one end is fixed and other end is free
one end is fixed and other end is hinged.
Explanation:
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24.
Flat spiral springs
consist of uniform thin strips
are supported at outer end
are wound by applying a torque
are used in clock-work mechanism
all the above.
Explanation:
No answer description is available. Let's discuss.

25.
A simply supported uniform rectangular bar breadth b, depth d and length L, carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is