71. If the velocity of air in a settling chamber is 0.3 m/s terminal velocity of the particle is 0.19 m/s then find out h/l ratio of chamber assuming eddy factor 0.5.
72. Use of alternative to explosives may prevent raising of dust.
73. Which drivage is cheaper and quicker.
74. Air velocities in smooth lined roads . . . . . . . . m/sec.
75. Which of the following statements is correct when presence of inflammable gas is detected in any place in a ventilating district?
76. In Jharia, fire near Londna and Fire area was prevented from spreading further by installing the fire area by
77. Where a shaft accommodates a pair of single cages, the diameter may be nearly.
78. Coal mines are said to be very steep; if the inclination is . . . . . . . .
79. An underground roadway through stone connecting two or more coal seams.
80. Drivage of roadway in coal in a mine, and their network reaches a predetermined boundary called a . . . . . . . .
Read More Section(Drilling and Blasting)
Each Section contains maximum 100 MCQs question on Drilling and Blasting. To get more questions visit other sections.
- Drilling and Blasting - Section 2
- Drilling and Blasting - Section 3
- Drilling and Blasting - Section 4
- Drilling and Blasting - Section 5
- Drilling and Blasting - Section 6
- Drilling and Blasting - Section 7
- Drilling and Blasting - Section 8
- Drilling and Blasting - Section 9
- Drilling and Blasting - Section 10