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Mine Ventilation MCQs Questions & Answers | Mining Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Mine Ventilation. These resources are available for mining engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Mine Ventilation chapter is particularly important for students studying mining engineering. Page-2 section-1

Each section contains 100 MCQs on Mine Ventilation .
11
In a coal mine district, air flows at a rate of 30 m3/s at a pressure of 1200 Pa. The density of air is 1.2 kg/m3. The mine management decided to reduce the flow rate of air to 20 m3/s using a regulator without changing the ventilation pressure. The area of regulator expressed in m2 will be
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
12
After blasting which gas come out.
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Answer & Solution
Answer: Option C
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13
A Roadheader district produces 20 mg/m3 of airborne dust with the following size distribution:
Size up to Cumulative wt%
1 μm 1
5 μm 5
10 μm 10
20μm 20
50μm 50
>50μm 100
The concentration of respirable fraction of dust in mg/m3 is
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
14
The wet bulb temperature of air at a particular place in a mine is 31°C, then the velocity of air in that place should be
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
15
Intake air containing 0.2% methane enters a section of an underground mine where emission of methane is 0.05m3/s. Assuming that the threshold limit value of methane is 1.25%, the minimum quantity of fresh air required in m3/s is
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
16
The figure shows PV (pressure-volume) diagram of a mine ventilated by both natural means and an exhaust fan. The total ventilation energy is represented by
Mine Ventilation mcq question image
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
17
The black damp accumulates . . . . . . . . to the floor
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Answer & Solution
Answer: Option A
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18
The inflammable gas should be below . . . . . . . . % in the general body of the retunr air way of any ventilating district and below . . . . . . . . % at any place in the mine.
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
19
A centrifugal fan rotating at 500 rpm. delivers 70 m3/s of air. If the speed is reduced to 200 rpm. the quantity of air delivered in m3/s will be
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Answer & Solution
Answer: Option C
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20
A fan running at a speed of 280 rpm circulates 105 m3/s of air in a mine. If the power input to the motor for driving the fan is recorded to be 75 kW, with the combined efficiency of fan and motor at 70%. If the fan pressure is to be increased by 200 Pa by changing the fan speed. the fan speed in rpm will become
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board