Drilling and Blasting MCQs Questions & Answers | Mining Engineering

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81.
Reversal of air current of natural ventilation, occurs.

A. In deeper mines during summer

B. In shallow mines during spring

C. In deeper mines during autumn

D. In shallow mines during summer to winter

Answer & Solution Discuss in Board Save for Later

82.
Which factor is important in sealing . . . . . . . .

A. Material supply

B. Inspection

C. Time

D. Delay of time

Answer & Solution Discuss in Board Save for Later

83.
An explosion is accompanied by violence on . . . . . . . . scale.

A. Small

B. Medium

C. Low

D. Large

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84.
The coefficient of friction measured in . . . . . . . .

A. mm of wg

B. kilomurg

C. kg/m³

D. N/m²

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85.
The air lock designs are

A. Standard type

B. Guillotine type doors

C. German type

D. All of these

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86.
In degree I mines the % inflammable gas is

A. Less than 0.1

B. 0.1 - 1

C. 1 - 10

D. Above 10

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87.
VOD of OCG is in m/sec

A. 6000

B. 5000

C. 7000

D. 8000

Answer & Solution Discuss in Board Save for Later

88.
The useful power developed by air current called . . . . . . . .

A. Theoritical depression

B. HP of ventilation

C. Manometric efficiency

D. Effective depression

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89.
High shock loss occurs in a mine ventilation system at

A. Evasee

B. Road way of narrow dimension

C. Fan drift split

D. 90° square bent

Answer & Solution Discuss in Board Save for Later

90.
Nearly flat gradients required for operation of thus haulage.

A. Direct

B. Loco

C. Main and trad

D. Gravity

Answer & Solution Discuss in Board Save for Later

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Drilling and Blasting MCQs Questions & Answers | Mining Engineering

81. Reversal of air current of natural ventilation, occurs.

Answer & Solution

82. Which factor is important in sealing . . . . . . . .

Answer & Solution

83. An explosion is accompanied by violence on . . . . . . . . scale.

Answer & Solution

84. The coefficient of friction measured in . . . . . . . .

Answer & Solution

85. The air lock designs are

Answer & Solution

86. In degree I mines the % inflammable gas is

Answer & Solution

87. VOD of OCG is in m/sec

Answer & Solution

88. The useful power developed by air current called . . . . . . . .

Answer & Solution

89. High shock loss occurs in a mine ventilation system at

Answer & Solution

90. Nearly flat gradients required for operation of thus haulage.

Answer & Solution

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81.
Reversal of air current of natural ventilation, occurs.

82.
Which factor is important in sealing . . . . . . . .

83.
An explosion is accompanied by violence on . . . . . . . . scale.

84.
The coefficient of friction measured in . . . . . . . .

85.
The air lock designs are

86.
In degree I mines the % inflammable gas is

87.
VOD of OCG is in m/sec

88.
The useful power developed by air current called . . . . . . . .

89.
High shock loss occurs in a mine ventilation system at

90.
Nearly flat gradients required for operation of thus haulage.