GATE 2026 CE (CE2) – Question 65
In an industry, a cyclone collector with 80 % efficiency is installed for air purification, followed by an electrostatic precipitator with 50 % efficiency. The concentration of particles entering the cyclone collector is 10 mg/m$^3$.
The concentration (in mg/m$^3$) of particles exiting the precipitator is __________ (*rounded off to two decimal places*).
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Correct answer: 0.99 to 1.01
Explanation
The cyclone lets 20 % of the particles through, leaving $10 \times 0.2 = 2$ mg/m$^3$. The precipitator then lets 50 % through, leaving $2 \times 0.5 = 1.00$ mg/m$^3$.