Mine Ventilation MCQs with Answers 2027

Q61

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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Q62

Open question

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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Q63

Open question

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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Q64

Open question

Oxygen flow rate in the self contained breathing apparatus Proto Mark IV is

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Q65

Open question

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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Q66

Open question

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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Q67

Open question

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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Q68

Open question

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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Q69

Open question

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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Q70

Open question

For Indian coal mines, the 'maximum allowable concentration' of respirable dust containing 7.5% free silica in mg/m³ is

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Q71

Open question

In an underground coal mine area the graham's ratio found 3% is the indication of

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Q72

Open question

A man exhales 0.002 m³ of CO₂ per min when working in a confined space in underground. Assuming that the fresh air contains 0.03% CO₂, the minimum quantity of fresh air to be supplied per person in m³/min, so that concentration of CO₂, in air never crosses 0.4%, will be

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Q73

Open question

The thermometer bulb covered with moist cloth called as

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Q74

Open question

In a mine ventilation system, the resistances of two splits A and B are 0.5 Ns²m^-8 and 2 Ns²m^-8 respectively. Combined resistance of two shafts and trunk airways is 0.7 Ns²m^-8. A quantity of 20 m³/s of air passes through split A. The total air power of the ventilation system in kW are

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Q75

Open question

CO₂ is best suited for extinguisher

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Q76

Open question

A gas mask does not include

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Q77

Open question

In a longwall panel, the main gate road is 1000 m long, 4.5 m wide and 2 m high. The gate road is to be used for airflow at the rate of 17 m³/s. Considering a coefficient of resistance of airways of 0.01, the pressure in Pa required to maintain the airflow in the gate road is

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Q78

Open question

The early indication of spontaneous heating of coal can be given by

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Q79

Open question

Quantity of air to be circulated to u/g workings where 150 worker employed in a largest shift and daily production 500 te will be

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Q80

Open question

The chemical protosorb used in

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