Theory of Structures - Section 1 (1)

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Theory of Structures - Section 1

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Pick up the incorrect statement from the following : The torsional resistance of a shaft is directly proportional to

A.	modulus of rigidity
B.	angle of twist
C.	reciprocal of the length of the shaft
D.	moment of inertia of the shaft section.

Answer: Option D

Explanation:

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For determining the support reactions at A and B of a three hinged arch, points B and C are joined and produced to intersect the load line at D and a line parallel to the load line through A at D'. Distances AD, DD' and AD' when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is

A.	30°
B.	45°
C.	60°
D.	90°

Answer: Option D

Explanation:

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If ΣH and ΣV are the algebraic sums of the forces resolved horizontally and vertically respectively, and ΣM is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon

A.	ΣH = 0
B.	ΣV = 0
C.	ΣM = 0
D.	all the above.

Answer: Option D

Explanation:

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Pick up the correct statement from the following:

A.	The bending moment which when acting alone would produce the maximum stress equal to the major principal stress caused by combined bending and torsion, is called equivalent bending moment
B.	Mcg = (M √M2 + r2) where letters carry their usual meanings
C.	Tcp = √m2 + T2 where letters carry their usual meanings
D.	The torque which when acting alone would produce maximum shear stress equal to the maximum shear stress caused by the combined bending and torsion, is called equivalent torque
E.	All the above.

Answer: Option E

Explanation:

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Pick up the correct statement from the following:

A.	The point of intersection of the bending axis with the cross section of the beam, is called shear centre
B.	For I sections, the shear centre coincides with the centroid of the cross section of the beam
C.	For channels, the shear centre does not concide its centroid
D.	Bending loads should pass through the shear centre to avoid twisting
E.	All the above.

Answer: Option E

Explanation:

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In plastic analysis, the shape factor for a triangular section, is

A.	1.5
B.	1.34
C.	2.34
D.	2.5

Answer: Option C

Explanation:

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If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:

A.	Q = S + F
B.	Q = S - F
C.	Q = F - S
D.	Q = S x F
E.

Answer: Option D

Explanation:

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The ratio of the deflections of the free end of a cantilever due to an isolated load at l/3rd and 2/3rd of the span, is

A.
B.
C.
D.

Answer: Option B

Explanation:

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Theory of Structures - Section 1 (1)

Theory of Structures - Section 1

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