GATE 2020 PI – Question 58
Manufacturing Processes II · Advanced Manufacturing · 2 marks · Numerical answer
A lossless waterjet uses pressure500 MPa and nozzle-orifice diameter0.25 mm. With water density1000 kg/m³, find mass flow in kg/min (two decimals).
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Correct answer: 2.85 to 3.00
Explanation
Pressure converts to jet kinetic energy: v=√(2p/ρ)=√(2×500×10⁶/1000)=1000 m/s. Area=π(0.00025)²/4. Mass rate=ρAv=0.049087 kg/s, giving2.9452 kg/min, or2.95.
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