Explanation

• The command used in AutoCAD to make round edges is the Fillet command
• Shortcut: F → Enter.
• It creates a curved connection with a specified radius.
• It is commonly used for rounding the corners of lines, arcs, polylines, and other objects.

Explanation

• AutoCAD Civil 3D is widely used for road and highway geometric design.
• It can create horizontal and vertical alignments.

Explanation

• A brick is considered weak if it absorbs more water
• More pores: High water absorption shows the brick has too many empty spaces inside.
• Less strength: These empty spaces make the brick weak and unable to hold heavy weight.

Additional information

• Good quality bricks should have low water absorption, typically less than 20% of their dry weight.

Explanation

For a simply supported beam carrying a UDL over the entire span:

• The maximum bending moment occurs at the center of the span.
• Formula: Mmax = wL^2/8​
• w = uniformly distributed load per unit length.
• L = span of the beam.

Explanation

• For an uncontrolled spillway, the freeboard generally provided is 3–4 m.
• Uncontrolled (ungated) spillways have no gates to regulate flow,
• So the dam must safely pass floodwaters without overtopping by a significant margin.
• This requires a larger freeboard buffer.

Additional information

• Controlled (gated) spillways: Since flow can be regulated, a smaller freeboard of 1–2 m is usually sufficient.

Explanation

Given:

• Diameter, $d=19mm=0.019m$
• Length, $L=1.51m$
• Tensile force, $P=150kN=150,000N$
• Modulus of Elasticity, E=200GPa=200×109N/m^2

Formula:

δ=PL/AE​

1. Cross-sectional area:

A=πd^2​/4

A=π(0.019)^2/4 ​=0.0002835 m^2

2. Axial elongation:

δ=150000×1.51/ 0.0002835×200×10^9

$$\delta =0.003994m$$

$$\delta =3.99mm$$

Answer: 3.99mm≈4mm​

Explanation

• Meandering occurs at the Trough stage of a river.
• Also known as the mature or middle/lower course of a river
• Why: Gentle gradient + slower flow → lateral erosion
• Result: River swings side to side, forming meanders

Additional information:

• Rocky/Mountain (headwater): Steep gradient, fast flow, vertical erosion → V-valleys, waterfalls; no meanders
• Delta: At river mouth, sediment deposits as fan-shaped distributaries; not meanders

Explanation

• Earthquakes generate dynamic/inertial forces in a dam.
• These forces can significantly increase the shear stress within the dam.
• Earthquake loading is therefore considered in the seismic design of dams.

Explanation

• Hydrostatic pressure is the pressure exerted by a fluid when it is at rest.
• It increases with the depth of water.
• The basic formula is: P = ρgh
• Here, ρ = density of water, g = acceleration due to gravity, and h = depth.
• It is important in the design of dams, tanks, reservoirs, and retaining structures.

Explanation

Standard Axle Load (ESAL benchmark) in pavement design:

• AASHTO standard: single axle load = 18,000 lb (18 kips)
• Metric equivalent: ≈ 80 kN
• In metric tonnes: ≈ 8.16 t
• Commonly rounded: 8 tonnes
• Purpose: benchmark load used to convert mixed traffic volumes into Equivalent Single Axle Loads (ESALs) for pavement thickness design.