Mine Environment MCQs Questions & Answers

1

How the anemometer is used to determine the average velocity of air?

A) Anemometer should be moved throughout the cross section of the roadway B) It is kept at the roof of the gallery C) It is laid at the floor of the roadway D) It is moved along a straight line

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Answer & Solution

Answer: Option A

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2

The important gaseous pollutants, contributing to acid rains, are

A) SO₂ and NO_x B) CO₂ and H₂S C) NO_x and O₃ D) None of the

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Answer & Solution

Answer: Option A

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3

The delay between the ignition and the application of the heat source termed as

A) lag on ignition B) incubation period C) saturation period D) thermal conductivity

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Answer & Solution

Answer: Option A

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4

A high volume air sampler is operated for 8 hrs in a mine with the flow rate of air varying from 1.5 m³/min to 1.3 m³/min. The empty weight of the filter paper is 2.30 g and the final weight is 2.65 g. The mean concentration of the suspended particulate matter (SPM) during the study period in μg/m³ is

A) 591 B) 550 C) 545 D) 521

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Answer & Solution

Answer: Option D

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5

What is the center frequency of the band number whose lower and upper bands are 1414 and 2828 Hz respectively?

A) 3000 Hz B) 1814 Hz C) 2000 Hz D) 1500 Hz

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Answer & Solution

Answer: Option C

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6

The primary aim of ventilation control in the event of fires is

A) to help fire fighters and rescuers as far as practicable B) to keep continuing the production work in the district C) arranging fire doors to control fire D) to withdraw workers from the mine as early as possible

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Answer & Solution

Answer: Option D

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7

The curvature of diffuser vane shall be so fixed that the fluid enters the guide passage with minimum loss. This is possible only when

A) the guide vane inlet angle is always less than $$\frac{\pi }{2}$$ rad B) the diffuser vane entrances angles are laid at same radii for a constant pitch C) the outlet velocity angle has tangential component only D) angle between guide vane inlet and the direction of the absolute velocity of air leaving the impeller is small or equal to

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Answer & Solution

Answer: Option D

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8

What is the mass of 1 m³ CH₄ at NTP?

A) 0.316 Kg B) 0.416 Kg C) 0.616 Kg D) 0.716 Kg

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Answer & Solution

Answer: Option D

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9

What should be minimum quantity of air to be circulated along a long wall face at its maximum speed of 7.5m for a 3m thick gassy seam of 3^rd degree?

A) 989.5 m³/min B) 1447.5 m³/min C) 1687.5 m³/min D) 2022 m³/min

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Answer & Solution

Answer: Option C

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10

Hairs of our nose can remove all particles of size, greater than

A) 1 mm B) 1 micron C) 10 micron D) 100 micron

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Answer & Solution

Answer: Option C

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Mine Environment MCQs Questions & Answers | Mining Engineering