Coal Mining MCQs Questions & Answers | Mining Engineering

A. 'V' Chisel

B. Clay Augr

C. Worm Augr

D. 'X' Chisel

A. Cavitation

B. Wear

C. Pulsation

D. Jamming

A. Prevent water percolation

B. Easy drilling operation

C. Prevent caving in of sides

D. None

A. 20%

B. 40%

C. 70%

D. 80%

A. Diagonal 60°

B. Parallel

C. Step diagonal

D. Diagonal 30°

A. $$\frac{{{\text{Area}}}}{{{\text{Perimeter}}}}$$

B. $$\frac{{{\text{Perimeter}}}}{{{{\left( {{\text{Area}}} \right)}^{\frac{1}{2}}}}}$$

C. $$\frac{{{\text{Perimeter}}}}{{{{\left( {{\text{Area}}} \right)}^{\frac{1}{4}}}}}$$

D. $$\frac{{{\text{Perimeter}}}}{{{{\left( {{\text{Area}}} \right)}^{\frac{1}{3}}}}}$$

A. 50 - 150 mm

B. 230 - 300 mm

C. 300 mm above

D. All these

A. Retaining key

B. Stirrup

C. Brace head

D. Sludger

A. 1889

B. 1879

C. 1899

D. 1869

A. Sinking drum process

B. Forced drop shaft method

C. Triggers method

D. All of these