Drilling And Blasting - Study Mode

Show All Answers

[#441] A system of ventilation normally adopted in metal mines is . . . . . . . .

(A) Country ventilation

(B) District ventilation

(C) Boundary ventilation

(D) All of these

Correct Answer

(C) Boundary ventilation

[#442] In controlled blasting the fly rock should not go height more than . . . . . . . .

(A) 3 m

(B) 4 m

(C) 5 m

(D) 6 m

Correct Answer

(A) 3 m

[#443] Quantity of air passing per min at a place given by the formula Q =

(A) A ÷ V

(B) A - V

(C) A × V

(D) A 2 × V

Correct Answer

(C) A × V

[#444] A gallery which cuts across the pillars, due to its drivage along apparent dip called

(A) Cross cut

(B) Drift

(C) Pillar

(D) Leve

Correct Answer

(A) Cross cut

[#445] Speed of coal drill rod.

(A) 240 rpm

(B) 300 rpm

(C) 400 rpm

(D) 600 rpm

Correct Answer

(D) 600 rpm