Drilling and Blasting MCQs Questions & Answers | Mining Engineering

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71.
In sinking shaft drilling is done by

A. Hand held jack hammer

B. Jack hammer on air leg

C. Jackhammer on stops

D. All of these

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72.
The coal dust, when suspended in air, is capable of bursting into . . . . . . . . explosion and propagate it.

A. Fire damp

B. Water gas

C. Coal dust

D. All of these

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73.
Rate of penetration of compressed air drills varies from . . . . . . . . in hard rocks in m/min.

A. 0.1 - 0.2

B. 0.2 - 0.3

C. 0.3 - 0.4

D. 0.4 - 0.5

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74.
Once the coal dust explosion starts, its propagation needs very small quantity of dust, only 1 gram per c.c of space which is equal to thickness of a layer of ordinary thick paper over a periphery of . . . . . . . .m road way.

A. 1.5 m × 1.5 m

B. 2.4 m × 2.7 m

C. 2.9 m × 3 m

D. 2.9 m × 3.2 m

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75.
An evasee is used in exhaustive ventilation is

A. Reduce static head of fan

B. Reduce shock loss

C. Recover velocity head lost to atmosphere

D. Improve air power of ventilation system

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76.
In reversal of air screw fan the quantity of air reduce to nearly . . . . . . . . on reversal.

A. 10%

B. 20%

C. 30%

D. 40%

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77.
Which drivage is ideal for trackless mining.

A. Shaft

B. Incline

C. Pit

D. Haul roads

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78.
Over burden heaps should be atleast . . . . . . . .m away from the coal face of a quarry.

A. 10

B. 15

C. 20

D. 25

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79.
The weight of soidum phosphate is . . . . . . . .

A. 150 g

B. 180 g

C. 190 g

D. 170 g

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80.
Fire involves live electrical equipment comes under

A. Class E fire

B. Class C fire

C. Class D fire

D. Class B fire

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

71. In sinking shaft drilling is done by

Answer & Solution

72. The coal dust, when suspended in air, is capable of bursting into . . . . . . . . explosion and propagate it.

Answer & Solution

73. Rate of penetration of compressed air drills varies from . . . . . . . . in hard rocks in m/min.

Answer & Solution

74. Once the coal dust explosion starts, its propagation needs very small quantity of dust, only 1 gram per c.c of space which is equal to thickness of a layer of ordinary thick paper over a periphery of . . . . . . . .m road way.

Answer & Solution

75. An evasee is used in exhaustive ventilation is

Answer & Solution

76. In reversal of air screw fan the quantity of air reduce to nearly . . . . . . . . on reversal.

Answer & Solution

77. Which drivage is ideal for trackless mining.

Answer & Solution

78. Over burden heaps should be atleast . . . . . . . .m away from the coal face of a quarry.

Answer & Solution

79. The weight of soidum phosphate is . . . . . . . .

Answer & Solution

80. Fire involves live electrical equipment comes under

Answer & Solution

Read More Section(Drilling and Blasting)

71.
In sinking shaft drilling is done by

72.
The coal dust, when suspended in air, is capable of bursting into . . . . . . . . explosion and propagate it.

73.
Rate of penetration of compressed air drills varies from . . . . . . . . in hard rocks in m/min.

74.
Once the coal dust explosion starts, its propagation needs very small quantity of dust, only 1 gram per c.c of space which is equal to thickness of a layer of ordinary thick paper over a periphery of . . . . . . . .m road way.

75.
An evasee is used in exhaustive ventilation is

76.
In reversal of air screw fan the quantity of air reduce to nearly . . . . . . . . on reversal.

77.
Which drivage is ideal for trackless mining.

78.
Over burden heaps should be atleast . . . . . . . .m away from the coal face of a quarry.

79.
The weight of soidum phosphate is . . . . . . . .

80.
Fire involves live electrical equipment comes under