Drilling and Explosives Knowledge

Front

In percussive drilling, the rock is broken by what action?

Back

crushing, chipping, both, none of above

Front

The drilling rods are made of?

Back

cast iron, steel, Ni-Cr, cast steel

Front

Which is used for raising and lowering the rods of square section?

Back

Bulldog, sludger, retaining key, none of the above

Front

Which is used for raising and lowering the rods of circular section?

Back

Bulldog, sludger, core barrel, retaining key

Front

The sludge or cuttings in the borehole are removed with the help of?

Back

core barrel, sludger, retaining key, bulldog

Front

The device used to catch broken rods under a joint in the borehole?

Back

crow's foot (or) spiral worm, sludger, screw feed, bulldog

Front

The operation of tracing the broken and lost parts in the hole and withdrawing them to the surface is known as...?

Back

lining the borehole, drilling, borehole survey, fishing the borehole

Front

What is the purpose of lining the borehole?

Back

to prevent caving of sides, to prevent water percolation, to easy drilling operation, none of the above

Front

The percussive drilling is applicable up to max depth of ....m?

Back

200, 300, 500, 700

Front

Diamond drilling is applicable up to a max depth of..... m?

Back

500, 1000, 3000, 5000