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GATE 2025 AR — Planning – Question 30

Infrastructure, Services and Utilities · Water carriage systems · 2 marks · Multiple choice

Match P combined sewer, Q vacuum sewer, R partially separate system, S pressurised sewer with 1 roof rain joins sewage but other stormwater stays separate, 2 sewage and all stormwater together, 3 pumps residences into pressure sewer, 4 negative pressure draws sewage and air, 5 fully separate sewage/stormwater networks.

  1. P–2; Q–4; R–1; S–3
  2. P–2; Q–3; R–5; S–4
  3. P–1; Q–4; R–5; S–3
  4. P–1; Q–3; R–1; S–4

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Correct answer: (A) P–2; Q–4; R–1; S–3

Explanation

Combined sewerage carries sewage with stormwater(2). Vacuum systems use negative pressure(4). A partially separate system admits specified roof/surface runoff to sewage while other stormwater stays separate(1). Pressure sewers use pumping(3). The matching sequence is 2, 4, 1, 3, A.

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