Drilling and Blasting MCQs Questions & Answers | Mining Engineering

A. Rate of gas emission in the drift

B. Temperature in the drift

C. R.H in the drift

D. None

A. 100 rpm

B. 200 rpm

C. 300 rpm

D. 400 rpm

A. 0.5

B. 2

C. 3

D. 4.5

A. 12 - 24

B. 20 - 24

C. 24 - 48

D. 48 - 52

A. 1 hour

B. 2 hours

C. 3 hours

D. 4 hours

A. 34 m

B. 30 m

C. 39 m

D. 45 m

A. $${R_1} - {R_2} - {R_3}.\,.\,.\,.\,.\,{R_n}$$

B. $$\frac{1}{{{R_1}}} + \frac{1}{{{R_2}}} + \frac{1}{{{R_3}}}.\,.\,.\,.\,.\,\frac{1}{{{R_n}}}$$

C. $$\frac{1}{{\sqrt {{R_1}} }} + \frac{1}{{\sqrt {{R_2}} }} + \frac{1}{{\sqrt {{R_3}} }}.\,.\,.\,.\,.\,\frac{1}{{\sqrt {{R_n}} }}$$

D. $$\frac{1}{{\sqrt {{R_1}} }} - \frac{1}{{\sqrt {{R_2}} }} - \frac{1}{{\sqrt {{R_3}} }}.\,.\,.\,.\,.\, - \frac{1}{{\sqrt {{R_n}} }}$$

A. Low explosive

B. High explosive

C. High VOD

D. All of these

A. Mouth to mouth

B. Schefe's method

C. Sylvester's method

D. All of these

A. $$\frac{{{\text{HP of ventilation}}}}{{{\text{HP input to engine}}}}$$

B. $$\frac{{{\text{HP of ventilation}}}}{{{\text{Fan Shaft HP}}}}$$

C. $$\frac{{{\text{Brake HP}}}}{{{\text{Air HP}}}}$$

D. None