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

A.
B.
C. πD2t fs
D.

Answer: Option A

Explanation:

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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:

A. σb = 10 N/mm2, σs = 20 N/mm2
B. σb = 8 N/mm2, σs = 16 N/mm2
C. σb = 6 N/mm2, σs = 12 N/mm2
D. σb = 5 N/mm2, σs = 10 N/mm2

Answer: Option A

Explanation:

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23. 

is the equation for Euler's crippling load if

A. both the ends are fixed
B. both the ends are hinged
C. one end is fixed and other end is free
D. one end is fixed and other end is hinged.

Answer: Option B

Explanation:

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24. 

Flat spiral springs

A. consist of uniform thin strips
B. are supported at outer end
C. are wound by applying a torque
D. are used in clock-work mechanism
E. all the above.

Answer: Option E

Explanation:

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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

A.
B.
C.
D.

Answer: Option C

Explanation:

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