Drilling and Blasting MCQs Questions & Answers | Mining Engineering

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81.
In the centrifugal fan re-entry of the discharged air is prevented by . . . . . . . .

A. Spiral casing

B. Blades

C. Evasee

D. Eye

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82.
The pressure actually developed by the fan and expended on over comming the mine called . . . . . . . .

A. Theoritical depression

B. Effective depression

C. HP of ventilation

D. Manometric efficiency

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83.
When wet bulb temperature and dry bulb temperature are some, what is the relative humidity.

A. 70%

B. 80%

C. 90%

D. 100%

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84.
Caustite removes . . . . . . . .

A. Sulphuretted hydrogen

B. Nitrous fumes

C. Fumes of CO

D. Fumes of CO₂

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85.
In solid blasting practice which of the following type of initiation is preferred?

A. direct

B. inverse

C. direct & inverse

D. split

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86.
Deflagration means

A. The phenomenon in which explosive burns without exploding

B. The phenomenon in which explosive burns with exploding libarates huge amount of heat and gases

C. The phenomenon in which explosive burns with exploding and libarate limited amount of heat and gases

D. None of these

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87.
Which type of air lock provided in Chinakure mine.

A. Standard type

B. Asian type

C. German type

D. Guillotine type

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88.
Which drivage is costlier and not quicker

A. Incline

B. Pit

C. Haul roads

D. All of these

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89.
Smoke helmet provided with a flexible hose pipe of length . . . . . . . . and dia of hose . . . . . . . .

A. 30, 25 mm

B. 38, 46 mm

C. 50, 50 mm

D. None

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90.
Exhaust fan requires air lock at . . . . . . . . shaft.

A. UC

B. DC

C. Air shaft

D. Middle

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

81. In the centrifugal fan re-entry of the discharged air is prevented by . . . . . . . .

Answer & Solution

82. The pressure actually developed by the fan and expended on over comming the mine called . . . . . . . .

Answer & Solution

83. When wet bulb temperature and dry bulb temperature are some, what is the relative humidity.

Answer & Solution

84. Caustite removes . . . . . . . .

Answer & Solution

85. In solid blasting practice which of the following type of initiation is preferred?

Answer & Solution

86. Deflagration means

Answer & Solution

87. Which type of air lock provided in Chinakure mine.

Answer & Solution

88. Which drivage is costlier and not quicker

Answer & Solution

89. Smoke helmet provided with a flexible hose pipe of length . . . . . . . . and dia of hose . . . . . . . .

Answer & Solution

90. Exhaust fan requires air lock at . . . . . . . . shaft.

Answer & Solution

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81.
In the centrifugal fan re-entry of the discharged air is prevented by . . . . . . . .

82.
The pressure actually developed by the fan and expended on over comming the mine called . . . . . . . .

83.
When wet bulb temperature and dry bulb temperature are some, what is the relative humidity.

84.
Caustite removes . . . . . . . .

85.
In solid blasting practice which of the following type of initiation is preferred?

86.
Deflagration means

87.
Which type of air lock provided in Chinakure mine.

88.
Which drivage is costlier and not quicker

89.
Smoke helmet provided with a flexible hose pipe of length . . . . . . . . and dia of hose . . . . . . . .

90.
Exhaust fan requires air lock at . . . . . . . . shaft.