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Velocity Pressure and Flow Estimation

Choose the correct option about Pitot tube employed in fire-fighting system. Statement-1: This is an instrument for the measurement of water velocity pressure. Statement-2: This can be used to determine approximate amount of water flowing with the help of size of opening (orifice/nozzle) and water velocity pressure.
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Answer & Explanation
Correct AnswerA. Both statements are True

Quick Explanation

A pitot tube measures velocity pressure in a water jet. Using that pressure to determine jet velocity and combining it with the known nozzle/orifice area allows approximate discharge to be calculated. Therefore both statements are true, corresponding to option A.

Formula / Key Relation

v≈√(2Δp/ρ); Q≈A v
Velocity Pressure and Flow Estimation explanatory diagram

Detailed Explanation

Correct Answer

A — Both statements are True

Statement-wise Analysis

Statement 1: True

Statement 2: True

Concept and Reasoning

A pitot tube measures velocity pressure in a water jet. Using that pressure to determine jet velocity and combining it with the known nozzle/orifice area allows approximate discharge to be calculated. Therefore both statements are true, corresponding to option A.

Calculation / Key Relation

v≈√(2Δp/ρ)

Q≈A v

Exam Takeaway

Pitot pressure → velocity → flow when nozzle area is known.

Common Mistake

The pitot tube does not directly measure volumetric flow without outlet geometry.

Quick Trick

Pitot pressure → velocity → flow when nozzle area is known.

Common Mistake

The pitot tube does not directly measure volumetric flow without outlet geometry.

Exam Tip

Pitot pressure → velocity → flow when nozzle area is known.

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