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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-7 section-1

Each section contains 100 MCQs on Mine Ventilation .
61
Match the followings:
Component of flame safety lamp Purpose of component
P. Asbestos ring 1. Dissipation of heat of flue gas
Q. Wire gauges 2. Formation of air-tight joints
R. Outer glass 3. Arrest of explosion inside the lamp
S. Combustion chimney 4. Separation of inlet air from flue gas
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Answer & Solution
Answer: Option A
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62
Proximate analysis of 50 g of a coal sample shows the following:
Moisture = 0.80 g
Ash = 7.85 g
Volatile matter = 15.90 g
The fixed carbon in percentage on a dry, ash free basis is
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Answer & Solution
Answer: Option E
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63
A pitot tube is inserted in a ventilation duct with the nose facing the air flow. A vertical U-tube manometer filled with alcohol (specific gravity 0.8) has been used for pressure measurements such that 10.2 mm is read as the total pressure and 8.8 mm as the static pressure. Given the density of air to be 1.2 kg/m3, the air velocity at the nose of the pitot tube in m/s is
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Answer & Solution
Answer: Option A
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64
Oxygen flow rate in the self contained breathing apparatus Proto Mark IV is
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Answer & Solution
Answer: Option C
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65
A toxic gas flows into a mine working place at the rate of 2.52 m3/min. The concentration of the gas in the intake air is 0.25%. The minimum quantity of intake air in m3/min required to dilute the gas to its threshold limit value of 1.0% is
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Answer & Solution
Answer: Option D
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66
A flammable mixture has 70% CH4 and 30% CO. The lower flammability limits for these gases are 5% and 13% respectively. For the mixture, the lower flammability limit in % is
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Answer & Solution
Answer: Option A
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67
Given the following,
Equation/formula/law Application
P. Bernoulli equation 1. Pressure loss in laminar flow of fluid
Q. Poiseuille equation 2. Drag loss due to regular obstructions in fluid flow
R. Bromilow's formula 3. Energy conservation in ideal fluid flow
S. Stokes law 4. Terminal settling velocity of fine particles in fluid
the correct match is
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Answer & Solution
Answer: Option A
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68
A mine ventilation system consists of two splits A and B with resistances of 0.8 Ns2m-8 and 3.2 Ns2m-8, respectively as shown in figure. Trunk airways have resistance of 0.2 Ns2m-8. The main mine fan is generating pressure of 500 Pa.
Mine Ventilation mcq question image
The flows in the two splits are equalized by placing a booster fan in split B. Assume that the fan pressure does not change after installation of the booster fan. The size of the booster fan in Pa is
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Answer & Solution
Answer: Option A
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69
Pressure characteristic of a mine fan is given by. P = -0.06Q2 + 400. where P is the pressure in Pa and Q is the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. An identical fan is installed in the mine to operate in series with the existing fan. The new mine quantity in m3/s is
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Answer & Solution
Answer: Option C
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70
For Indian coal mines, the 'maximum allowable concentration' of respirable dust containing 7.5% free silica in mg/m3 is
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Answer & Solution
Answer: Option A
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