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Mine Environment MCQs Questions & Answers | Mining Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Mine Environment. These resources are available for mining engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Mine Environment chapter is particularly important for students studying mining engineering. Page-4 section-1

31
The noise level at 10 m from a long conveyor belt was 95 dBA. What is the noise level at 100 m?
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Answer & Solution
Answer: Option A
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32
A mine airway 2m wide, 2.5m high and 500m long. The airway passes a quantity of 8m3 per second. Calculate its pressure loss? Assume k = 0.0098 NS2m-4
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Answer: Option C
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33
A worker is exposed to 86 dB for six hours and 92 dB for three hours, giving a nine hour working day. Determine the dose % and TWA.
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Answer: Option A
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34
In a surface mine, sound pressure level at a location generated by operation of a dozer and a drill respectively are 80 dBA and 60 dBA, when operated independently. The sound pressure generated by the dozer compared to the drill is higher by a factor of
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Answer: Option A
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35
If velocity of air in a settling chamber is 0.3 m/s, terminal velocity of the particle is 0.19 m/s then find out h/I ratio of the chamber assuming eddy factor 0.5
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Answer: Option A
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36
A miner when doing hard work at 307 K may sweat at the rate of
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Answer: Option D
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37
A spherical droplet of water, with density 1000 kg/m3 and diameter of 1 μrn, is falling in air. The viscosity of air is 1.85 × 10-5 kg/m.s. Neglecting air density and assuming that the settling of droplet in air follows Stokes' Law, the settling velocity in m/s is
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Answer: Option B
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38
A single lamp placed centrally at the roof provides 40 lux illumination vertically below, at the floor of an underground workshop. The workshop of dimensions 20 m × 20 m with height 4m. Assuming uniform spherical dispersion of luminous intensity, the floor level illumination in lux at any corner of the workshop is
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Answer: Option D
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39
At a surface mine office the independent Sound Pressure Level (SPL) measured in dB(A) on account of 3 drill machines are 85,88 and 85. If all the three machines work simultaneously, the combined SPL, in dB (A) is
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Answer: Option A
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40
A filament bulb produces 30 lux illumination at point A as shown in the figure. Assuming that no other source of lighting present in the roadway, the illumination level in lux at point B will be
Mine Environment mcq question image
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Answer: Option D
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