Question

In high-rise buildings, the method adopted to prevent ingress of smoke in an enclosed fire staircase is \underline{\hspace{2cm}}.

• A. Polarization
• B. Pressurization
• C. Perpetuation
• D. Fumigation

Hint:

Always remember: In fire staircases, pressurization = safety. Without it, smoke easily seeps into escape routes, causing casualties.

Answer 1

The Correct Option is B

Step 1: Fire Safety Challenge.
\nIn fires, smoke inhalation is a greater hazard than flames, causing suffocation, obscuring vision, and hindering escape. High-rise building enclosed stairwells must remain smoke-free. \n\n \n

Step 2: Smoke Control Principle.
\nSmoke moves from high-pressure areas (fire zones) to low-pressure areas (stairwells). By **maintaining higher air pressure within the stairwell shaft**, smoke intrusion can be prevented. \n\n \n

Step 3: Pressurization Defined.
\nPressurization is achieved by mechanical fans supplying continuous fresh air to the stairwell, ensuring: \n\[\nP_{\text{staircase}} > P_{\text{adjacent rooms}}\n\] \nThis creates outward airflow from the stairwell to adjacent areas, blocking smoke entry. \n\n \n

Step 4: Incorrect Options Rejected.
\n- (A) Polarization → Electrical phenomenon, irrelevant.
\n- (C) Perpetuation → Means to continue, not applicable to fire safety design.
\n- (D) Fumigation → Chemical pest control, unrelated.
\n\n \n

Step 5: Conclusion.
\nOnly pressurization effectively addresses the problem. \n\n \n

Final Answer: \n\[\n\boxed{\text{Pressurization}}\n\]