List of top Civil Engineering Questions

Lacey’s regime equations, followed in India for making scour calculations while designing hydraulic structures across alluvial channels, are given below. Regarding these equations, which of the following statements is/are true:

The shaft of a 6 m wide gate in the figure will fail at a moment of 3924 kN.m about the hinge P. The maximum value of water depth \( h \) (in m) that the gate can hold is ......... (round off to the nearest integer).

A 4 x 4 group pile, with each pile 20 m long and 500 mm in diameter, is installed in a square pattern in a clayey soil, as shown in the figure. The average unconfined compressive strength of the soil is 100 kN/m\(^2\), and the adhesion factor is 0.8. Neglect the bearing at the tip of the piles. For a group efficiency factor of 1.0, the centre to centre spacing(s) of the piles (in m) would be ......... (round off to two decimal places).

The drag force, \( F_D \), on a sphere due to a fluid flowing past the sphere is a function of viscosity, \( \mu \), the mass density, \( \rho \), the velocity of flow, \( V \), and the diameter of the sphere, \( D \). Pick the relevant (one or more) non-dimensional parameter(s) pertaining to the above process from the following list.

For a partially saturated soil deposit at a construction site, water content (\(w\)) is 15%, degree of saturation (\(S\)) is 67%, void ratio (\(e\)) is 0.6 and specific gravity of solids in the soil (\(G_s\)) is 2.67. Consider unit weight of water as 9.81 kN/m\(^3\).
To fully saturate 5 m\(^3\) of this soil, the required weight of water (in kN) will be __________ (round off to the nearest integer).

Consider steady flow of water in the series pipe system shown below, with specified discharge. The diameters of Pipes A and B are 2 m and 1 m, respectively. The lengths of pipes A and B are 100 m and 200 m, respectively. Assume the Darcy-Weisbach friction coefficient, \( f \), as 0.01 for both the pipes.
The ratio of head loss in Pipe-B to the head loss in Pipe-A is ___________ (round off to the nearest integer).

From a flow-net diagram drawn under a concrete dam, the following information is obtained:
(i) The head difference between upstream and downstream side of the dam is 9 m.
(ii) The total number of equipotential drops between upstream and downstream side of the dam is 10.
(iii) The length of the field nearest to the toe of the dam on the downstream side is 1 m.
If the soil below the dam is having a saturated unit weight of 21 kN/m\(^3\) and the unit weight of water is 9.81 kN/m\(^3\), then the factor of safety against the quick condition will be __________ (round off to two decimal places).

Given the following data, determine the final water content \( W_2 \):

Given: - \( W_1 = 18\% \) - \( G_p = 2.74 \) - \( S_1 = 0.65 \) - \( S_2 = 0.852 \) - Find \( W_2 \)

Given the following data for a hydraulic jump, determine the power loss (in kW):

Given: - \( B = 5 \, \text{m} \) - \( Q = 15 \, \text{m}^3/\text{sec} \) - \( y_1 = 0.5 \, \text{m} \) - \( g = 9.81 \, \text{m/s}^2 \) - \( \rho_w = 1000 \, \text{kg/m}^3 \) - \( \alpha = 1.0 \) - Find Power loss in kW

As per IS 456 : 2000, Limit state of collapse – flexure, the maximum strain in reinforcing bars under tension at failure shall not be less than ……… , where \( f_y \) is the characteristic strength of steel and \( E_s \) is the Modulus of elasticity of steel.

The shape of the influence line diagram for horizontal thrust in a symmetrical three-hinged parabolic arch is

While computing the values of limits of consistency and consistency indices, it is found that liquidity index has negative value. Consider the following comment on this value.
1. Liquidity index cannot have a negative value and should be taken as zero.
2. Liquidity index can have a negative value.
3. The soil tested is in semisolid state and stiff.
4. The soil tested is in medium soft state.
Which of these statements are correct?

The main function of lateral ties in a reinforced concrete rectangular column under axial compression is to

If the hinged end of a propped cantilever of span \( L \) settles by an amount \( \delta \), then the rotation of the hinged end will be

An undrained triaxial compression test is carried out on a saturated clay sample under a cell pressure of 50 kN/m². The sample failed at a deviator stress of 100 kN/m². The cohesion of this clay sample would be

In a simply supported beam \( (l + 2a) \) with equal overhangs \( (a) \) and carrying a uniformly distributed load over its entire length, B.M. at the middle point of the beam will be zero if

Consider the following statements:
1. ‘Relative compaction’ is not the same as ‘relative density’.
2. Vibroflotation is not effective in the case of highly cohesive soils.
3. ‘Zero air void line’ and ‘100\% saturation line’ are not identical.
Of these statements:

The vertical deflection at the free end of a quadrantal ring (Radius \( R \) with uniform flexural rigidity \( EI \)) which is fixed at the base and subjected to a vertically downward load \( W \) at the free end is

Consider the following statements:
1. Constant head permeameter is best suited for determination of coefficient of permeability of highly impermeable soils.
2. Coefficient of permeability of a soil mass decreases with an increase in viscosity of the pore fluid.
3. Coefficient of permeability of a soil mass increases with an increase in temperature of the fluid.
Of these statements:

What will be the unit weight of a fully saturated soil sample having water content of 38% and grain specific gravity of 2.65?

The ratio of the maximum deflections of a beam simply supported at its ends with an isolated central load and that of with a uniformly distributed load over its entire length, is

A scratch is made on the surface of the brick. In a good brick, no impression will be left on the surface. This process of testing of bricks is called as