Question

Wet riser and dry riser are integral part of which of the following system in building.

• A. Water supply
• B. Waste water management
• C. Electrical system
• D. Firefighting system

Hint:

Difference between riser systems:
• Wet Riser $\rightarrow$ Always filled with water
• Dry Riser $\rightarrow$ Filled by fire brigade during emergency Both are commonly used in high-rise buildings for firefighting.

Answer 1

The Correct Option is D

Concept: In building services, wet risers and dry risers are important components of fire protection systems used in multistorey buildings.
• A wet riser is a vertical pipe permanently filled with water and connected to a water supply source.
• A dry riser is a vertical pipe normally kept empty and charged with water by fire brigade pumps during emergencies. These systems help firefighters access water quickly at different floor levels during fire incidents.

Step 1: Understand the purpose of wet and dry risers.
Wet and dry risers are specifically designed for:
• Fire suppression,
• Emergency firefighting operations,
• Efficient water distribution during fire emergencies.

Step 2: Analyze the given options.
• Water supply -- General building water distribution system, not specifically riser systems for firefighting.
• Waste water management -- Concerned with drainage and sewage disposal.
• Electrical system -- Related to power distribution and electrical installations.
• Firefighting system -- Wet risers and dry risers are integral parts of fire protection systems. \checkmark Therefore, the correct answer is: \[ {\text{Firefighting system}} \]