Drilling and Blasting MCQs Questions & Answers | Mining Engineering

A. 4.2 m × 2 m

B. 3 m × 1.8 m

C. 2 m × 1.8 m

D. 2 m × 2 m

A. Changing the rotation of motor

B. By changing the doors

C. Changing blades

D. All of these

A. $$\frac{1}{{HP}} \propto {N^2}{\text{ or }}{V^2}{\text{ or }}{Q^2}$$

B. $$HP \propto {N^3}{\text{ or }}{V^3}{\text{ or }}{Q^3}$$

C. $$\frac{1}{{{N^3}}} \propto {V^3}{\text{ or }}{Q^3}{\text{ or }}{N^3}$$

D. None

A. Moderate length

B. Quite long

C. Quite short

D. All of these

A. More

B. Less

C. Medium

D. All of these

A. 2/2000, 5/1975

B. 3/2001, 11/2009

C. 2/1985, 2/1990

D. 7/2002, 4/2010

A. Ratio of quantity of air reading last connection and quantity of air forced down by fan

B. Ratio to velocity to quantity

C. Ratio to speed to pressure

D. The ratio of quantity of air reaching the last ventilation connection and quantity of air entering the district

A. District

B. Barrier

C. Rib

D. Chowkidar

A. Manometri cefficiency

B. Mechanical efficiency

C. Overall efficiency

D. None

A. 9%

B. 10%

C. 12%

D. 13%