In case of opencast working where permanent building, structure not belonging to Owner lies within the danger zone, the aggregate maximum charge per delay and per round shall not exceed the amount fixed by
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The Shotfirer shall not fire more than "A" shots in one shift with multi-shot Exploder in a gassy seam of 2nd or 3rd degree
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Maximum flow velocity in a canal occurs at
A. Bottom
B. Top
C. 3 1
D. 2 1
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The minimum height of travelling roadway.
A. 1.8 m
B. 2.2 m
C. 3 m
D. 4.2 m
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Hydrazine is used for detection of which of the following gas.
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A connection between two levels in ore body dirven in downward direction.
A. Rise
B. Draw point
C. Dip
D. Drought
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The angle between the chord of aerofoil and the direction of the average relative velocity of air is called . . . . . . . .
A. Angle of attack
B. Specific capacity
C. Co-efficient
D. Angle of friction
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The gradient from brow to inclined mouth and in the incline is steep nearly.
A. 1 in 2
B. 1 in 3
C. 1 in 4
D. 1 in 5
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Air screw fan pushes air forward in the direction parallel to the . . . . . . . .
A. Axis
B. Centrifugal
C. Centripatel
D. Tangential to circumface
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Low explosive fired by
A. Detonation
B. Shockwave
C. Detonator
D. Ignition
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In this stage of self heating, the petrol like odour comes.
A. Initial
B. Secondary
C. Final
D. All of these
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The gas which accumulates at the roof level below the fire stopping is
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Which is the deepest under ground coal mine in India.
A. JK3
B. Clunakuri Coal Mine
C. Jharia Coal Mine
D. Moonidih Coal Mine
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The amount of stone dust deposited in the each shell of light weight barrier.
A. 50 kg
B. 75 kg
C. 100 kg
D. 125 kg
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P - V curve showing the relationship between fan drift w.g and . . . . . . . .
A. Volume of air flowing into the mine given by equivalent orifice
B. Volume of air flowing in return air way
C. Volume of air flowing in only one district
D. All of these
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The presence in the air of fine dry coal dust lower the lower limit of explosibility of methane air mixture to well below the usual . . . . . . . .%.
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If the fire involves inflammable liquids comes under
A. Class A fire
B. Class B fire
C. Class C fire
D. Class E fire
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Amount of explosive to be charged in a single shot hole is not dependent on
A. nature of rock to be broken
B. hole depth
C. dia of hole
D. quality of detonating fuse
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Explosives grouped in . . . . . . . . types depending upon the speed which explosive effects produced.
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The rescue apparatus smoke helmet (or) hose mask for use at a place of irrespirable air, which is not far from an area of fresh air, upto about . . . . . . . .m.
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