Drilling and Blasting MCQs Questions & Answers | Mining Engineering Page-8 section-9

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71.
Methods commonly employed for drivage of gallens of coal are . . . . . . . .

A. Method of drivages of coal cutting machines and drills

B. Method of drivages with headings machines, continuous miner, angur, road header

C. Method of drivage with coal drills and tubs

D. All of these

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72.
The reversal of ventilation may be advantages if fire is in . . . . . . . . shaft.

A. DC

B. UC

C. Air shaft

D. None

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73.
What is the range of heat produced due to oxidation of coal.

A. 1.7 MJm^-3

B. 3.79 MJm^-3

C. 5.79 MJm^-3

D. 8.79 MJm^-3

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74.
Air samples from behind stopping should be between the hours . . . . . . . .

A. 9 - 12 AM

B. 12 - 2 PM

C. 1 - 3 PM

D. 3 - 4 PM

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75.
Explosions in coal mines are

A. Fire damp

B. Coal dust

C. Water gas

D. All of these

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76.
In the mine is running under medium resistance series and parallel fans arrangement gives the same results in the region of about . . . . . . . . % more air.

A. 20

B. 10

C. 50

D. 60

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77.
How will you decide the diameter of drill rod to be used in UG coal mines?

A. the rod must allow a clearance of at least 0.3 ern over the cartridge diameter

B. the rod shall be same as that of roof bolting drill

C. there is no such conditions to be adhered for fixing diameter of rod

D. it depends on the face dimension and of drill pattern fixed by CM

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78.
It is the area of imaginary opening in a thin plate which offer the same resistance to the passage of air as offered by the mine itself called . . . . . . . .

A. Orifice

B. Equivalent HP

C. Equivalent orifice

D. Square orifice

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79.
An explosive is required to be in normal handling.

A. Very sensitive

B. Highly sensitive

C. High VOD

D. Insensitive

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80.
Speed of air in a mine measured by

A. Permeability

B. Thermal conductivity

C. Cooling power

D. Anemometer

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

71. Methods commonly employed for drivage of gallens of coal are . . . . . . . .

Answer & Solution

72. The reversal of ventilation may be advantages if fire is in . . . . . . . . shaft.

Answer & Solution

73. What is the range of heat produced due to oxidation of coal.

Answer & Solution

74. Air samples from behind stopping should be between the hours . . . . . . . .

Answer & Solution

75. Explosions in coal mines are

Answer & Solution

76. In the mine is running under medium resistance series and parallel fans arrangement gives the same results in the region of about . . . . . . . . % more air.

Answer & Solution

77. How will you decide the diameter of drill rod to be used in UG coal mines?

Answer & Solution

78. It is the area of imaginary opening in a thin plate which offer the same resistance to the passage of air as offered by the mine itself called . . . . . . . .

Answer & Solution

79. An explosive is required to be in normal handling.

Answer & Solution

80. Speed of air in a mine measured by

Answer & Solution

Read More Section(Drilling and Blasting)

71.
Methods commonly employed for drivage of gallens of coal are . . . . . . . .

72.
The reversal of ventilation may be advantages if fire is in . . . . . . . . shaft.

73.
What is the range of heat produced due to oxidation of coal.

74.
Air samples from behind stopping should be between the hours . . . . . . . .

75.
Explosions in coal mines are

76.
In the mine is running under medium resistance series and parallel fans arrangement gives the same results in the region of about . . . . . . . . % more air.

77.
How will you decide the diameter of drill rod to be used in UG coal mines?

78.
It is the area of imaginary opening in a thin plate which offer the same resistance to the passage of air as offered by the mine itself called . . . . . . . .

79.
An explosive is required to be in normal handling.

80.
Speed of air in a mine measured by