Mining Engineering · all questions

Drilling and Blasting
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Q161

It involves the pressure drop between points called . . . . . . . .

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Q162

Commonly recommended explosives in wet condition in mines.

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Q163

The h.p of coal drills normally of . . . . . . . .

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Q164

The drivages are located at any convenient place in the property.

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Q165

A connection between two levels in ore body driven upward direction.

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Q166

The drive in the vein itself, in the wall rock usually in footwall.

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Q167

To render the collodin cotton safe to handle it is to be

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Q168

In Reviving apparatus the dial calibrator from zero to . . . . . . . . Iitres per min.

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Q169

Taking the air to the rise side of the district and allow to travel it to lower levels as it to ventilate the working places called . . . . . . . .

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Q170

A self rescuer should be used immediately at the first sign of fire or explosion even of no smoke is visible called

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Q171

In sinking shaft drilling is done by

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Q172

The coal dust, when suspended in air, is capable of bursting into . . . . . . . . explosion and propagate it.

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Q173

Rate of penetration of compressed air drills varies from . . . . . . . . in hard rocks in m/min.

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Q174

Once the coal dust explosion starts, its propagation needs very small quantity of dust, only 1 gram per c.c of space which is equal to thickness of a layer of ordinary thick paper over a periphery of . . . . . . . .m road way.

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Q175

An evasee is used in exhaustive ventilation is

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Q176

In reversal of air screw fan the quantity of air reduce to nearly . . . . . . . . on reversal.

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Q177

Which drivage is ideal for trackless mining.

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Q178

Over burden heaps should be atleast . . . . . . . .m away from the coal face of a quarry.

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Q179

The weight of soidum phosphate is . . . . . . . .

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Q180

Fire involves live electrical equipment comes under

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