GATE MN 2026 Paper 1 — page 18

Complete GATE MN 2026 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

Paper practice 65 questionsPage 18 of 22

A main mechanical ventilator installed for an underground mine develops a pressure of 25 mm wg. A natural ventilation pressure (NVP) of 15 mm wg acting in the mine aids the ventilator, and a total 500 m

min

of air is circulated in the mine. Considering the same NVP aiding the ventilator, the pressure required, in mm wg, to be generated by the ventilator to circulate 1000 m

min

of air, is ____________. (answer in integer)

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Dust particles from a blasting operation rise up in the atmosphere to a height of 500 m. The viscosity of air is 1.80 × 10

kg m

. Assume the particles have quiescent settling (no turbulence) in atmosphere. Neglecting air density, the settling time, in days, of a dust particle of 2.5 μm diameter and 3600 kg m

density is ____________. (rounded off to two decimal places)

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In a biochemical oxygen demand (BOD) test, 15 ml of wastewater sample was diluted with distilled water to completely fill a 300 ml BOD bottle and incubated at 20 °C for 5 days. The dissolved oxygen (DO) level before and after incubation are 9.2 mg liter

and 4.4 mg liter

, respectively. The BOD of the sample, in mg liter

, is ____________. (answer in integer)

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2026 · Paper 1

Question 52

Question 53

Question 54