Question 1

If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

Accepted Answer

The answer of If the ratio of long and short...

Question 2

Total pressure on the vertical face of a retaining wall of height per unit run exerted by the retained earth weighing per unit volume, is

Accepted Answer

The total pressure on the vertical face of a retaining wall is calculated using the formula for lateral earth pressure. The correct formula is wh² [(1 - sin φ)/2(1 + sin φ)], where w is the unit weight of the earth, h is the height of the wall, and φ is the angle of internal friction.

Question 3

A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is

Accepted Answer

The moment of resistance of a singly reinforced beam can be calculated using different approaches, all of which are represented by the options given. Option A represents the moment of resistance based on the dimensions and permissible compressive stress, option B represents it based on the area of tensile reinforcement and permissible tensile stress, and option C represents a more general form involving the critical neutral axis. All these expressions are valid under different contexts or assumptions in the analysis of reinforced concrete beams, hence all the options are correct.

Question 4

If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is

Accepted Answer

The answer of If l1 and l2 are the lengths...

Question 5

If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

Accepted Answer

The strength of an RCC column can be calculated using any of the given formulas, as they all represent valid approaches to account for the different materials (concrete and steel) and their properties (modular ratio, maximum stress) in the composite section of the column. Each formula incorporates the areas of concrete and steel, the modular ratio, and the maximum stress in concrete, adjusting for the contribution of each material to the overall strength of the column.

Question 6

If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

Accepted Answer

The maximum bending moment per metre width for longitudinally spanning stairs casted along with their landings is taken as wl²/8, where w is the load per unit area and l is the span length. This formula is derived based on the assumption that the stairs and their landings behave as simply supported beams.

Question 7

If P kg/m² is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

Accepted Answer

The correct formula for the depth of foundation D is D = 0.00775 a?P. This formula is derived from the theory of soil mechanics and takes into account the upward pressure on the slab, the projection of the slab on either side of the wall, and the allowable bearing capacity of the soil.

Quiz 2: Civil Engineering Design and Analysis