GATE 2026 Chemical Engineering, Q12 · Instrumentation
The correct answer is B, to alert when high pressure is detected in the tank.
Question
In the P&ID shown below, which one of the following is the function of PAH in the process?
- A. to maintain a constant pressure in the vessel by throttling the pump outlet
- B. to alert when high pressure is detected in the tank
- C. to measure the average pressure in the vessel and display it locally
- D. to regulate the flow from the vessel to downstream users
Official answer: to alert when high pressure is detected in the tank
Why
GATE 2026 official key: (B). PAH = Pressure Alarm High, it triggers an alert when vessel pressure exceeds a high setpoint.
Explanation cross-checked for consistency. Final answer matches the official IIT answer key.