Mining Engineering · all questions

Drilling and Blasting
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Q881

The safe working period of BG 174 is . . . . . . . . in hard work.

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Q882

Boundary ventilation system is possible where the D.C and U.C shafts located at . . . . . . . . ends of property and the air from the intake and return side is practically eliminated.

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Q883

Which of the following statements seems to be correct in relation to detonators?

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Q884

Lower limit of methane air mixture.

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Q885

The diameter of sampling pipe in fire stopping is

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Q886

The increase in the quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .% for every 100 m depth.

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Q887

Main purpose of development is . . . . . . . .

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Q888

The type of fan employed to improve the quantity of air in one or more districts having high resistance without increasing the total quantity of air ciculated by the main surface fan

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Q889

In which drivage needs skill men to drive it.

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Q890

Maximum velocities of ventilating air at conveyor roads, loading points and transfer points.

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Q891

The fan characteristics help in selecting a particular mine?

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Q892

Maximum quantity of air leaks in a coal mine ventilation is at

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Q893

Gun powder having effect

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Q894

In a continuous miner face, why forcing ventilation undesirable.

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Q895

The self heating of coal in underground mines the ratio CO/O₂ defficiency gradually . . . . . . . .

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Q896

Blades of rotor of air screw fan, the angle or pitch can be varried by . . . . . . . .

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Q897

In which ventilation system the amount of coal dust is less . . . . . . . .

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Q898

On the rescue plan and stone dusting plan should also be shown the

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Q899

No shot shall be fired unless the length of fuse is at least "A" meter. A is given by

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Q900

Identify the wrong statement pit bottom air lock.

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