Mining Engineering · all questions

Drilling and Blasting
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Q801

Main ingradient of the chemical used in dry powder type extinguisher.

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Q802

Find the empirical relation between depth of hole (h) and gas content (V), A and B are constants

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Q803

Modern flame safety lamp can with stand an air velocity of . . . . . . . . m/sec.

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Q804

What happens, if the booster fan is placed too far out bye of the neutral line.

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Q805

If CO/O₂ deficiency ratio is 2% it indicates . . . . . . . .

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Q806

Staple pit also called as . . . . . . . .

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Q807

Air crossings constructed where intake and return air . . . . . . . .

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Q808

The air tubes normally available in lengths of . . . . . . . . in meters.

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Q809

The ventilation system is adopted for continuous miner headings.

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Q810

To prevent recirculation of air, the quantity of air taken by the auxiliary fan not exceed the quantity of air current from which the air passing through the fan is drawn.

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Q811

The formule for finding blade tip speed.

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Q812

The life of exhaust fan is . . . . . . . . compared to forcing fan.

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Q813

A person doing normal work (not heavy works) breaths at a rate of nearly . . . . . . . . breaths per minute.

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Q814

O₂ cylinder capacity with O₂ at 200 kg/cm² . . . . . . . . litters in BG 174.

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Q815

Distance between two air lock doors should not be less than.

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Q816

The minimum insulation resistance of high power cable is . . . . . . . .

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Q817

It is one of the oldest drilling technologies where hole is drilled by striking a number of blows at short intervals on the rock by a chisel type tool and between the blows the tool is rotated. The drilling is called

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Q818

In which of the following drilling method causes less bit wear.

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Q819

The charge per hole in the blasting gallery method is . . . . . . . .

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Q820

The detonator used in electrical storms where static electricity is there

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