Theory Of Structures

This is an MCQ-based quiz on the Theory Of Structures.

This includes Structural members that can be classified as beams, columns and tension structures, frames, and trusses.

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A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,

10 m 12 m 14 m 16 m

The stiffness of the close coil helical spring is

d4N/8D3n d4N/4D3n 4D3N/d4n 8D3N/d4n

Pick up the correct statement from the following:

In a loaded beam, the moment at which the first yield occurs is called yield moment In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area All the above

Maximum strain theory for the failure of a material at the elastic limit, is known as

Guest's or Trecas' theory St. Venant's theory Rankine's theory Haig's theory

A body is said to be in equilibrium if

It moves horizontally It moves vertically It rotates about its C.G. None of these

A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be

2/3 3/2 5/8 8/5

Principal planes are subjected to

Normal stresses only Tangential stresses only Normal stresses as well as tangential stresses None of these

Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then

M/I = R/E = F/Y I/M = R/E = F/Y M/I = E/R = F/Y M/I = E/R = Y/F

A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is

M/T T/M 2M/ T 2T/M

A masonry dam (density = 20,000 N/m³) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be

75 N/m² 750 N/m² 7500 N/m² 75000 N/m²

What is the shape factor for a triangular section In plastic analysis?

1.5 2.5 1.34 2.34

Which of the following is the equivalent length of a column of length having both the ends fixed?

L L/2 2 L None of the above

The maximum principal stress theory for the failure of a material at an elastic point is known as ..............

Von Mises' theory Rankine's theory St. Venant's theory None of the above

Which of the following is the correct statement?

If tensile stress is less than axial stress, the section experiences compressive stress If tensile stress is equal to axial stress, the section experiences compressive stress The moment of inertia is calculated about the axis about which bending takes place All of the above

What is the ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar?

1 2 3 4

The shape factor of standard rolled beam section varies from

1.20 to 1.30 1.30 to 1.40 1.10 to 1.20 1.40 to 1.50

Stress may be defined as

Force per unit area Force per unit length Force per unit volume None of the above

The shape factor for a circular section, is ......... in plastic analysis.

1.6 1.5 1.7 None of the above

The forces in the members of simple trusses, may be analysed by

Method of joints Graphical method Method of sections All of the above

Coefficient of wind resistance of a rectangular surface is ..........

1/2 1/3 2/3 3/2