Explanation

• Merchant ships: 0.30 to 1.00 m (provides a stable but comfortable roll for crew and cargo).

Additional information

• Sailing ships: 0.45 to 1.25 m (higher values help resist wind forces on sails).
• Warships / Battleships: 1.00 to 1.50 m (higher stability ensures safety even after taking damage).
• River crafts: Up to 3.50 m (very high values due to shallow drafts and wide configurations)

Explanation

• Ratio: 4:1 is the standard (range: 3:1 to 5:1).
• Purpose: Prevents short-circuiting and ensures uniform water flow.

Explanation

 Canal Bank Terms

• Spoil bank: Piles of surplus excavated soil.
• Canal bank: Main embankment to hold water.
• Guide bank: Directs river flow through structures.
• Marginal bank: Levee to prevent flood spilling.

Explanation

•  Bleeding: Heavier solids settle down, pushing free water to the surface.

Additional information

• Segregation: The general separation of concrete mix components.
• Compaction: Mechanical shaking or packing to remove trapped air.
• Shrinkage: Volume reduction as concrete dries and hardens over time.

Explanation

• Perennial: Continuous, year-round water supply from permanent rivers.

Additional information

• Inundation: Seasonal supply only during river floods.
• Temporary: Non-standard engineering classification.
• Navigation: Built for boat transport, not water distribution.

Explanation

• A frog is the depression provided on the surface of a brick.
• In masonry, it is generally kept on the top face.
• Mortar fills the frog and provides a better bond.
• It helps improve the strength and stability of brick masonry.

Explanation

• One end of the column is fixed and the other is free.
• Its effective/equivalent length is 2L.
• This condition gives the column a higher effective length.
• It is important when calculating the buckling load.

Explanation

• Factor of Safety (FOS) indicates the safety margin of a foundation.
• It is calculated as: Ultimate bearing capacity ÷ Safe bearing capacity.
• A higher factor of safety provides a greater safety margin.
• It helps ensure that the soil remains safe under the applied load.

Explanation

Given:

Brickwork = 100 cft

Mortar ratio = 1: 5

For rate analysis of brickwork, the standard quantity of cement for 100 cft of brickwork in 1:5 mortar is approximately 4 bags.

Explanation

Given ratio 1 : 6 : 12

Step 1: Total ratio

$$1+6+12=19$$

Cement = 1 part.

Step 2: Dry volume of concrete

For concrete, dry volume is usually taken as:

400×1.54=616 ft3

Step 3: Cement volume

191​×616=32.42 ft3

Step 4: Number of cement bags

1 cement bag (50 kg) ≈ 1.25 ft³

1.2532.42​=25.94

≈26 bags​