GATE MN 2020 Paper 1 — page 17

Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.

A diesel loader produces 60 l/s of exhaust fumes containing 500 ppm of CO. The incoming air has 10 ppm of CO. The minimum amount of air flow in m

/s that is needed at the loader to dilute CO to a permissible level of 50 ppm is ________ (round off to 1 decimal place).

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The equation for peak particle velocity (PPV) from blast induced ground vibration is given by

, where

and

are site constants.

In a field study, the following readings are recorded.

Sensor No.	PPV in mm/s	Sensor distance from blast site (D) in m	Charge per delay (Q) in kg
1	5.5	200	100
2	3.4	300	100

The value of

is ________ (round off to 3 decimal places).

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An underground copper mine sends 250 tonnes of ore per day to the concentrator plant having an average grade of 1.2% Cu. The plant produces concentrate of 25.0% Cu with a recovery of 93.0%. The solids portion of tailings generated from the plant per day in tonnes is ________ (round off to 1 decimal place).

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2020 · Paper 1

Question 39

Question 40

Question 41