Non cap sensitive explosive is also known as
A. Cap sensitive
B. Booster sensitive
C. Primer sensitive
D. Fuse sensitive
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It is the rate at which the detonation wave passes through a column of explosive
A. Strength
B. VOD
C. Density
D. Sensitivety
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Handwheel type bye pass valve fitted in proto . . . . . . . .
A. Mark IV
B. Mark V
C. Mark VI
D. All of these
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Which of the following has poor water resistant property?
A. ANFO
B. Slurry explosive
C. Emulsion explosive
D. NG based explosive
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The Type booster occupy only 1-2% of total explosive charge
A. TNO booster
B. PETN booster
C. Detonator
D. None
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Strength of any weight of explosive compared with the same weight of . . . . . . . .
A. Blasting gelatine
B. Nitroglecerene
C. Open cast gelatine
D. TNT
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The temperature of the sealed of fire area is increasing or decreasing observed by means of . . . . . . . .
A. Hydrometer
B. Thermometer
C. By hand
D. R.H Meter
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A person inhales . . . . . . . . l/min oud O2 consumption l/min . . . . . . . . during rest.
A. 8 - 10; 0.3 - 0.9
B. 8 - 10; 0.3 - 0.4
C. 15 - 20; 0.6 - 0.9
D. None
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The reversal prevents the smoke and fumes from reaching the working.
A. Machinery
B. Faces
C. Pannel
D. None
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In which of the following case the conditions requiring use of permitted explosives has not been made mandatory?
A. coal seams with dry bands
B. near shaft pillar
C. stone-drift if does contain coal dust
D. drivages through rocky material with intermittent coaly bands
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The samples should be taken behind the sealed of area when the barometric pressure is . . . . . . . .
A. High
B. Medium
C. Medium
D. Low
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Explosive is solid/liquid/mixture of substances which change themselves instantaiously in to large volume of gases at high temperature and pressure when . . . . . . . . applied to it.
A. Detonation
B. Deflection
C. Wave
D. Burning
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The primary or forward shockwave precedes the flames of explosion which consumes all . . . . . . . . of the air.
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Forcing fan requires air lock at . . . . . . . . shaft.
A. Upcast
B. DC shaft
C. Air shaft
D. Middle
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The formula for calculating lower limit of explosibility of gas mixture [X] = ?
A. [ N 1 P 1 − N 2 P 2 − N 3 P 3 100 ] %
B. [ N 1 P 1 + N 2 P 2 + N 3 P 3 100 ] %
C. [ P 1 N 1 − P 2 N 2 − P 3 N 3 100 ] %
D. [ N 1 P 1 + P 2 N 2 + P 3 N 3 100 ] %
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Width wise, the sampling pipe should be placed . . . . . . . . of the stopping.
A. Side
B. Middle
C. Bottom
D. All of these
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In more dumping space facility the tippler used is . . . . . . . .
A. Runing tippler
B. Travelling tippler
C. Siding tippler
D. Turning tippler
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It is the measure of the amount of energy released by an explosive during blasting and ability to do work.
A. VOD
B. Density
C. Strength
D. Sensitivety
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The equivalent resistance of 3 similar roadway of 0.09 N sec2 m-8 , resistance each connected in parallel is
A. 0.27 N sec2 m-8
B. 0.03 N sec2 m-8
C. 0.0033 N sec2 m-8
D. 0.01 N sec2 m-8
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The reverse wave (or) secondary wave which is smaller face than . . . . . . . . wave.
A. Primary
B. Backlash
C. Shock
D. All of these
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