Mining Exam Paper PDF

1,The oxygen percentage in intake air is? (a) 20.28 % (b) 78.04 % (c) 20.93 % (d) 25 % 3 2,The oxygen percentage in return air is? (a) 20.28 % (b) 78.04 % (c) 20.93 % (d) 25 % 1 3,Decay of timber by fungus growth is...

1,The oxygen percentage in intake air is? (a) 20.28 % (b) 78.04 % (c) 20.93 % (d) 25 % 3 2,The oxygen percentage in return air is? (a) 20.28 % (b) 78.04 % (c) 20.93 % (d) 25 % 1 3,Decay of timber by fungus growth is caused by? (a) CH4 (b) O2 absorption (c) N2 depletion (d) CO2 2 4,Each 1 % reduction in the O2 % results in about the depletion from the light is? (a) 10 % (b) 20 % (c) 30 % (d) 40 % 3 5,The light of oil lamps is extiguished when O2 % is falls to? (a) 19 % (b) 17.5 % (c) 21 % (d)20 % 2 6,Mining laws in India require that mine air should contain minimum % of O2 is? (a) 25 % (b) 21 % (c) 19 % (d) 17 % 3 7,CO2 is mostly found at? (a) roof (b) middle of the roadway (c) dip areas of depillaring areas (d) anywhere in the mine 3 8,The permissible limit of CO2 is? (a) 0.5 % (b) 1.25 % (c) 0.75 % (d) 1 % 1 9,Flame safety lamp is extinguished at CO2 %? (a) 1 – 2 (b) 2 – 3 (c) 3 – 4 (d) 4 – 5 3 10,Black damp is mixture of? (a) CO2+N2(b) CO2+H2 (c) CO2+02 (d) CO2+CO 1 11,Black damp is also called as? (a) stink damp or stythe (b) Marsh gas (c) choke damp (d) white damp 3 12,For every 5% of black damp the light is diminished by ? (a) 20 % (b) 30 % (c) 40 % (d) 50 % 2 13,The light is extinguished when black damp % is? (a) 17 % (b) 17.5 % (c) 21 % (d) 20 % 1 14,Co is aslo called as? (a) Black damp (b) Marsh gas (c) Stink damp (d) White damp 4 15,CO forms an explosive mixture with air when present within the range of nearly(by vol)? (a) 5 – 15 (b) 4.5 – 45 (c) 12 – 75 (d) 4.5 – 75 3 16,Incomplete oxidation of coal result? (a) CO2 (b) CO (c) CH4 (d) None 2 17,The permissible limit of the CO is? (a) 10 ppm (b) 50 ppm (c) 7 ppm (d) 5 ppm 2 18,Hopcolite is used to detect ? (a) CO (b) CO2 (c) CH4 (d) SO2 1 19,Hopcolite is a mixture of? (a)Manganeese diaoxide + copper oxide (b) Potasium superoxide + copper oxide (c)silica gel +potasium pelladiam sulphate (d) Iodine pentaxide + sulphuric acid 1 20,Hoolamite is a mixture of? (a) Manganeese diaoxide + copper oxide (b) Potasium superoxide + copper oxide (c) silica gel +potasium pelladiam sulphate (c) Iodine pentaxide + sulphuric acid 4 21,The minimum ppm of CO detected by CO detectors is? (a) 3 (b) 5 (c) 10 (d)50 2 22,In M.S.A CO detector which tubes are used? (a) P.S detector tubes (b) Hopcolite (c) Hoolamite (d) None 1 23,Which is formed in stangnent water in old workings in the areas of gob? (a) CH4 (b) SO2 (c) H2S (d) CO2 3 24,H2S is aslo called as? (a) stink damp (b) Marsh gas (c) choke damp(d) white damp 1 25,when mixed with air H2S forms on explosive mixture the limits of inflamability is ? (a) 5 – 15 (b) 4.3 – 45 (c) 12 – 75 (d)4.5 – 75 2 26,Which can be found by blotting paper soaked in lead acetate changes its color to black? (a) SO2 (b) H2 (c) H2S (d) CH4 3 27,The permissible limit of the H2S is ? (a) 10 ppm (b) 50 ppm (c) 7 ppm (d) 5 ppm 3 28,The permissible limit of the SO2 is ? (a) 10 ppm (b) 50 ppm (c) 7 ppm (d) 5 ppm 1 29,When mixed with air H2 forms on explosive mixture the limits of explosibility is ? (a) 5 – 15 (b) 4.3 – 45 (c) 12 – 75 (d) 4 – 75 4 30,The permissible limit for the nitrous fumes is? (a) 10 ppm (b) 50 ppm (c) 7 ppm (d)5 ppm 4 31,Methane gas is also called as? (a) stink damp (b) Marsh gas (c) choke damp (d) white damp 2 32,Methane can be found at? (a) roof (b) floor (c) Any place in the roadway (d) Exhaust gases of the locomotive 1 33,M.S.A methanometer is worked on the principle of? (a) Formation of gas cap (b) Wheatstone bridge (c) Infraradiation (d) Optical properties 2 34,Spiralaram is worked on the principle of? (a) Formation of gas cap (b) Wheatstone bridge (c) Infraradiation (d) Optical properties 1 35,Ring rose detector works on the principle of? (a) Formation of gas cap (b) Wheatstone bridge (c) Diffusion-combustion-contraction (d) Optical properties 3 36,Interferometers works on the principle of? (a) Formation of gas cap (b) Wheatstone bridge (c) Infraradiation (d) Optical properties 4 37,One kg of methane in burning evolves.....kcal of heat? (a) 10000 (b) 12000 (c) 13600 (d) 15000 3 38,The minimum voltage at which the methanometer works with accuracy is? (a) 1 v (b) 1.5 v (c)2.2 v (d)3 v 3 39,The wetbulb temparature in development faces should not exceed? (a) 30 deg c (b) 33.5 deg c (c) 35 deg c (d) 38 deg c 2 40,The minimum quantity of air per person in deg III mine is? (a) 6 cu.m/min (b) 8 cu.m/min (c) 10 cu.m/min (d) 12 cu.m/min 2 41,If the wet bulb temparature exceeds 30.5 deg c at any place air current should be faster than ? (a) 1 m/s (b) 2 m/s (c) 3 m/s (d) 0.5 m/s 1 42,whirling hygrometer is rotated with a speed of? (a) 100 rpm (b) 200 rpm (c) 300 rpm (d) 400 rpm 2 43,The value of the kata factor is ? (a) 250 (b) 300 (c)380 (d)480 4 44,The unit for the kata factor is? (a) millicolories/sq.cm/sec (b) kcal/sec/sq.cm (c) millicolories/sq.cm (d) millicolories/sec/sq.cm 3 45,The difference between the atmosphere pressure and the total pressure on the fan drift is called? (a) Velocity pressure of surface fan (b) Static pressure (c) Total pressure of surface fan (d)none 3 46,Static pressure is measured by? (a) Barometer (b) Pitot tube (c) Venturi meter (d) U-tube 4 47,Velocity pressure is measured by? (a) Barometer (b) Inclined manometer (c) U-tube (d) Pitot tube 4 48,Cooling power is a combination of temparature of air ;relative humidity and...? (a) Moisture content of air (b) density of air (c) velocity of air (d) Pressure 3 49,For light manual workers the wet kata is? (a) 18 (b) 25 (c) 30 (d) 8 2 50,Ordinary U-tube manometers are not useful for measurment of gas velocities? (a) below 12 m/s (b) 13 to 20 m/s (c) 20 to 30 m/s (d) above 30 m/s 1 51,Geothermic gradient in indian coal seam is....? (a) 1 deg c per 15 m (b) 1 deg c per 38m (c) 1 deg c per 50 m (d) none 2 52,Upto what depth from the surface the temparature is constant? (a) 10m (b) 15m (c) 20m (d) 25m 2 53,The speed of the centrifugal fan is? (a) to 100 rpm (b) 100 to 300 rpm (c) 300 to 1000 rpm (d) above 1000 rpm 2 54,The mostly used blade type in centrafugal fan is? (a) backward (b) radial (c) forward (d) none 1 55,The presence of Nitrous fumes are detected by? (a) The rotten eggs smell (b)sweet smell (c) metallic taste on tongue (d) head ache 4 56,The noxious and infalmmable gasses of old workings of a coal mine expands when there is? (a) sudden rise of temperature (b) sudden heavy roof fall (c) sudden rise in barometric pressure (d) sudden drop in barometric pressure 4 57,The instrument that is used to measure the relative humidity is? (a) pitot tube (b) aneroid barometer (c) hygrometer (d) anemometer 3 58,For comfortable working conditions the reasonable velocity of air at the working face is? (a) 0.5 to 2 m/s (b) 3 to 4 m/s (c) 5 m/s (d) 6 m/s 1 59,cooling power by conduction convection and radiation is given by using the ? (a) dry bulb temperature (b) wet bulb temparatute (c) Average time of wet and dry bulbs (d) wet and dry bulb time and velocity of air 2 60,Inclined water guage is used for the measurment of water guage for? (a) smaller than 200 mm (b) greater than 200 mm (c) smaller than 50 mm (d) greater than 50 mm 3 61,The inclined water guage can read upto? (a) 2 mm (b) 1.5 mm (c)1 mm (d) 0.2 mm 4 62,The velocity of air flowing in a drift where the velocity pressure is 36 mm is? (a) 36 m/s (b) 24 m/s (c) 42 m/s (d) 48 m/s 2 63,In the centrifugal fan smooth flow air and conversion of velocity energy into pressure energy takes place? (a) In spiral casing (b) In the blades (c) At the tip of the blades (d) In the evasee 4 64,In the centrifugal fan reentry of of the discharged air is prevented by? (a) spiral casing (b) blades (c) evasee (d) eye 1 65,With a centrifugal fan for a given quantity of air increase of efficiency of the and reduction in cost of power can be obtained with? (a) well designed blades of the fan (b) well designed spiral casing (c) well designed evasee (d) well designed eye of the impeller 3 66,The maximum permissable speed of the axial flow fan is? (a) 8000 m/min (b) 6000 m/min (c) 5200 m/min (d) 4200 m/min 4 67,The maximum water guage developed in axial flow fan is? (a) 10 cm (b) 12.5 cm (c) 13.5 cm (d) 15 cm 2 68,The water guage developed and quantity circulated with an axial flow fan depend on ? (a) Size of the fan (b) Shape of the blades (c) Design of the evasee (d) Speed of the blade tips 4 69,with a axial fan direction of travel of air current to the mine is changed by? (a) changing direction flow of air into fan by means of doors (b) changing the blades on the rotor (c) changing the direction of rotation of the motor (d) not possible with this type of fan 3 70,The pitch of the blades of axial flow fans is? (a) 1 to 5 deg (b) 5 to 10 deg (c) 10 to 15 deg (d) 15 to 20 deg 3 71,By varying the pitch of the blades the pressure generated by axial flow fan is? (a) remains same (b) decreases (c) increases (d) increases 8 times 1 72,The water guage of a axial flow fan can be increased by? (a) increasing speed of rotation (b) changing the pitch of blades (c) installing 2 or more stages (d) enlarging the evasee of the fan 3 73,The manometric efficiency of axial flow fan is? (a) 10 to 20 % (b) 70 to 85 % (c) 20 to 30 % (d) 40 to 50 % 3 74,The ovarall efficiency of axial flow fan is? (a) 10 to 20 % (b) 70 to 85 % (c) 20 to 30 % (d) 40 to 50 % 2 75,Modern flame safety lamps can withstand an air velocity of? (a) 5 m/s (b) 10 m/s (c) 15 m/s (d) 20 m/s 3 76,The maximum air velocity at the face is? (a) 1.7 m/s (b) 3 m/s (c) 5 m/s (d) 7.5 m/s 1 77,The maximum air velocity at the main haulage roads is? (a) 1.7 m/s (b) 3 m/s (c) 5 m/s (d) 7.5 m/s 3 78,Air velocities in diesel locomotive sheds sholud not be less than? (a) 4 m/s (b) 2 m/s (c) 1 m/s (d) 0.75 m/s 4 79,If the quantity of air passing through airway has to be increased from 1200 cu.m/min to 2400 cu.m/min the effect of HP of fan is? (a) 8 times (b) 4 times (c) 2 times (d) 1/2 times 1 80,If the velocity of the air is doubled then the water guage increased will be? (a) 2 times (b) 4 times (c) 8 times (d) 1/2 times 2 81,The area of the regulator required for flow of a certain quantity of air can be calculated from the formula is? (a) PQ / 75 (b) K*S*Q2/A3 (c) 0.385Q/sqrt(P) (d) none 3 82,In a mine of high resistance the series arrangement of fans gives a considerable increase in the quantity of air flowing is? (a) 10 % (b)20 % (c) 30 % (d)40 % 3 83,In a mine of high resistance the parallel arrangement fans a considerable increase in the quantity of air flowing is? (a)10 % (b) 20 % (c) 30 % (d) negligible 4 84,In a mine of medium resistance both series and parellel arrangement of fans give the same result that the increase in the air quantity is? (a) 20 % (b) 30 % (c) 40 % (d) 50 %s 1 85,In a mine of low resistance the parellel arrangement of the fans gives the increase in the air quantity by? (a) 20 % (b) 30 % (c) 40 % (d) 50 % 4 86,When the wet bulb temparature exceeds 33.5 deg then the rise in the body temparature is? (a) 3 deg (b) 2 deg (c) 1 deg (d) 0.5 deg 3 87,Man dies when the body temparature is rise maximum upto ? (a) 38 deg (b) 41 deg (c) 43 deg (d) 48 deg 3 88,For breaking up the methane layer formed in the roof the minimum layering number required is? (a) 4 (b) 3 (c) 2 (d) 1 3 89,While testing with safety lamp for CH4 if the minimum length of the blue flame is 11.5 mm then the % of methane is? (a) 1.5 (b) 2.0 (c) 2.5 (d) 3.0 4 90,The rise in the pressure due to auto compression is.....per 100 m? (a) 1.1 kpa (b) 2 kpa (c) 2.9 kpa (d) 3.5 kpa 1 91,The rise in the dry bulb temparature of air due to auto compression is.....per 100 m depth? (a) 2 K (b) 1.96 K (c) 1.012 K (d) 0.976 K 4 92,At 300 K the working efficiency of a worker is ? (a) 100 % (b) 80 % (c) 60 % (d) 50 % 1 93,The angle of the evasee is ? (a) 4 deg (b) 6 deg (c) 8 deg (d) 10 deg 2 94,The ratio between H.P of ventilation and H.P of Fan shaft is called ? (a) Mechanical efficiency (b) Manometric efficiency (c) Ovarall efficiency (d) Fan efficiency 4 95,The ratio between H.P of ventilation and H.P input to engine is called? (a) Mechanical efficiency (b) Manometric efficiency (c) Ovarall efficiency (d) Fan efficiency 1 96,The sensitivity of the vertical U-tube manometer is? (a) 1 pa (b) 5 pa (c) 10 pa (d) 15 pa 3 97,The sensitivity of Inclined guage manometer is? (a) 0.2 pa (b) 0.4 pa (c) 1 pa (d) 2 pa 2 98,Heat stroke is caused when the wet bulb temparature is? (a) 294 K (b) 300 K (c) 312 K (d) 320 K 3 99,The efficiency of the workman if the wet bulb temparature in the mine is 310 K? (a) 100 (b) 75 (c) 50 (d) 25 4 100,For hard workers the dry kata is? (a) 8 (b) 18 (c) 10 (d) 30 3 101,The minimum thickness of the ventilation stoping is? (a) 25 cm (b) 30 cm (c) 38 cm (d) 45 cm 3 102,The ventilation system which takes intake ventilating air to the lowest point of the district or face and allow it to travel to higher levels to ventilate the district before it goes to the return? (a) Ascential ventilation (b) Descential ventilation (c) Homotropal (d) Antitropal 1 103,Natural ventilation pressure assists the fan ventilation pressure in case of? (a) Ascential ventilation (b) Descential ventilation (c) Homotropal (d) Antitropal 1 104,When the air and mineral flow in the same direction the ventilation is called? (a) Ascential ventilation (b) Descential ventilation (c) Homotropal (d) Antitropal 3 105,The effect of splitting the air in parallel is ? (a) Overall resistance of mine increases (b) Overall resistance of mine decreases (c) Pressure produced by fan increases (d) pressure produced by fan decreases 2 106,The ventilating door should open against the intake air so that? (a) Air leakage takes from intake to return (b) The air pressure normally keeps the door closed (c) Recirculation of foul air avoided (d) Regulations are compiled with 2 107,Splits reduce the doors on haulage roads but ? (a) Increase pressure (b) Decrease quantity (c) Increase Number of air crossings (d) none 3 108,The quantity of air to be circulated by an auxiliary fan depends upon? (a) Length of the heading (b) Number of persons in the drift (c) Size of the drift (d) Rate of emission in the roadway 4 109,The quantity of air drawn by an auxiliary fan from the air way should not exceed? (a) equal to quantity (b) 1/3 of quantity (c) 3/4 of quantity (d) 1/1.5 of quantity 2 110,The minimum distance between the fan and the corner of the drift to be ventilated should be? (a) 3 m (b) 4 m (c) 5 m (d) 6 m 3 111,The quantity of the air per minute should be..... per sq.m of working area? (a) 2.5 cu.m (b) 6 cu.m (c) 7 cu.m (d) 8 cu.m 3 112,On reversal of air current by axial flow fan the quantity of air reduces to..? (a) 20 % (b) 30 % (c) 40 % (d) 60 % 3 113,If the booster is placed inbye of the neutral line? (a) Leakage is maximum (b) Zone of recirculation takes place (c) Fan will damage (d)none 2 114,Compressed air jets increased the air flow by ? (a) 10 % (b) 20 % (c) 30 % (d) 40 % 2 115,Venturi tubes increased the air flow by? (a) 10 % (b) 20 % (c) 30 % (d) 40 % 3 116,The increase in the quantity of air due to expansion in the upcast shaft can be roughly taken as? (a)1 % for every 15 m (b) 1 % for every 50 m (c) 1 % for every 100 m (d) 5 % for every 100 m 3 117,Anemometers are used to measrure air velocities between? (a) 60 - 1000 m/min (b) 0 - 10 m/min (c) 10 -50 m/min (b) 50 - 60 m/min 1 118,The vanes of the anemometes are....deg to the direction of airflow? (a) 10-20 (b) 20-30 (c) 30-40 (d) 40-50 4 119,For obtaining good results measurment of quantity flowing through an airway on either side of velocity measuring point the roadway should be uniform in cross section for a length of? (a) 2 m (b) 5 m (c) 10 m (d) 15 m 4 120,The minimum reading with a velometer can be taken as ? (a) 0.5 m/sec (b) 0.05 m/sec (c) 0.1 m/sec (d) 0.01 m/sec 2 121,For measuring air velocities less than 1 m/sec........is used? (a) Anemometer (b) Velometer (c) Smoke generator (d) Pitot static tube 3 122,In smoke generator for measuring air velocity the time taken by the smoke to travel....m is recorded? (a) 4 - 6 m (b) 6 - 8 m (c) 8 - 10 m (d) 10 - 12 m 3 123,In anemometer the angle of yaw should be ? (a) less than 30 deg (b) less than 20 deg (c) less than 15 deg (d) less than 10 deg 4 124,The accuracy obtained in precise traversing is? (a) more than 5 % (b) 5 % (c) 3 % (d) 2 % 4 125,Air lock doors are required to be arranged where pressure on the door is? (a) more than 250 pa (b) less than 250 pa (c) more than 500 pa (d) less than 500 pa 1 126,In refrigerant circulation system the refrigerant used is? (a) Ammonia (b) Calcium chloride (c) Freon-12 (d) Corbon dioxide 1 127,Good and harmless refrigerent in the following refregerents is? (a) Corbon dioxide (b) Methyl chloride (c) Freon -12 (d) Ammonia gas 3 128,Profilometer is used for measuring? (a) Air velocity (b) cross section of irregular shape (c) Pressure of the air (d) % of CH4 2 129,Ammonia should not be used in U/g mines as it forms an explosive mixture with air if present..... by volume? (a) 30 % (b) 40 % (c) 50 % (d) 20 % 1 130,The best extinguisher for fires involved live electrical equipment is? (a) CO2 type (b) Foam type (c) Water -CO2 type (d) Soda acid type 1 131,The best extinguisher for fires due to oil is? (a) CO2 type (b) Foam type (c) Water - CO2 type (d) Soda acid type 2 132,The best extinguisher for gasseous fires is? (a) Drypowder (b) CO2 type (c) Foam type (d)Water - CO2 type 1 133,If a quarry is abandoned the coal and the OB dump should be seperated by digging a trench....m wide? (a) 1 - 2 m (b)3 - 5 m (c) 6 - 10 m (d)11 - 15 m 3 134,The coal stock should not exceed atleast? (a) 200 te (b) 100 te (c) 50 te (d) 400 te 1 135,The height of the coal stock should not exceed atleast? (a) 1 to 1.5 m (b) 1.5 to 3 m (c) 3 to 4 m (d) 4 to 5 m 2 136,The ignition temparature of the bituminous coal is? (a) 500 deg (b) 450 deg (c) 398 deg (d) 200 deg 4 137,The coals are more prone to spantaneous heating if the coal having atleast? (a) 25 % V.M (b) 15 % V.M (c) 40 % V.M (d) 50 % V.M 1 138,The coal is not liable to spantaneous heating if the coal has oxygen content? (a) less than 2 % (b) 4 % (c) 8 % (d) more than 9 % 1 139,In CO2 extinguisher the pressure of the CO2 in liquid form is? (a) 30 kg/sq.cm (b) 50 kg/sq.cm (c) 70 kg/sq.cm (d) 100 kg/sq.cm 3 140,Halon is also called as? (a) CTC (b) BCF (c) TNT (d) Ammonia sulphate 2 141,Thermal conductivity of shale is....of sandstone? (a) equal (b) 1/4 (c) ½ (d)1/3 4 142,The incubation period in SCCL mines is? (a) 6 months (b) 10 months (c) 18 months (d) 24 months 3 143,In spontaneous heating the temparature of the initial stage is upto.....deg? (a) 70 (b) 100 (c) 130 (d )200 3 144,The coal is more prone to spantaneous heating if the moisture content is? (a) 0-2 % (b) 2 - 4 % (c) 4 - 7 % (d) 7 - 15 % 4 145,Spantaneous heating is more likely to occur in coals of? (a) vitrian (b) clarion (c) durain (d)fussin 1 146,Spantaneous heating is more likely to occur in coals of? (a) Peat (b) Lignite (c) Bituminous (d) Antracite 4 147,With CO/O2 deficiency ratio 2 % indicates? (a) Normal condition (b) existance of spantaneous heating (c) Heating in advance stage (d)Active fire 3 148,Do not allow the burning of fires within.....m from on incline opening? (a) 10 (b) 15 (c) 20 (d) 25 2 149,Isolation stoping in deg I and II gassy coal mine should have minimum thickness of? (a) 1 m (b) 2 m (c) 3 m (d) 4 m 1 150,The isolation stoping should be explosion proof if the minimum CH4 % behind the stoping is...? (a) 1 % (b) 2 % (c) 3 % (d) 4 % 2 151,The minimum thickness of the explosion proof isolation stoping is? (a) 1 m (b) 3 m (c) 4.5 m (d) 6 m 3 152,Isolation stoping should have minimum depth of locking in shale is? (a) 1 m (b) 75 cm (c) 15 cm (d) 30 cm 4 153,In Gypsum stopings for every cu.m of stoping volume about...te of gypsum is required? (a) 1.3 (b) 1.8 (c) 2.5 (d) 3 1 154,The sample pipe should pass through the temporary stoping and should extend....m beyond it towards the fire side? (a) 1 m (b) 2 m (c) 3 m (d) 4 m 3 155,Isolation stopings are ? (a) Preparatory stopings (b) Temporary stopings (c) Perminent stopings (d) none 1 156,Temporary stopings are constructed ? (a) Before depillaring is under taken (b) After heating or fire is detected © To seal off an area (d) none 2 157,Stopings should always be ket white washed on the surface and at the roof floor and sides for.....m outbye for every detection of cracks? (a) 1 (b) 2 (c) 3 (d) 4 1 158,During the process of seaing fire area below ground the atmosphere near the stoing should be tested frequently for ? (a) Methane (b) CO (c) O2 deficiency (d) Both CO and O2 4 159,Air samples behind the stoping should be drawn during the periods of? (a) High barometric pressure (b) Low barometric pressure © Medium barometric pressure (d) none 2 160,Air samples from behind the stopings should be collected between? (a) 6 am to 9 am (b) 9 am to 12 noon (c) 12 noon to 2 pm (d) 10 pm to 12 pm 3 161,The blanketing layer which is used to detect cracks in stopings should be....m thick? (a) 1 (b) 2 (c) 3 (d) 4 3 162,Explosive limit of the CH4 is? (a) 4.3 % to 45 % (b) 4.3 % to 75 % (c) 5 % to 15 % (d) 4.3 % to 12 % 3 163,The maximum explosive violence is produced when the explosive mixture contains firedamp? (a) 5 % (b) 9 % (c) 15 % (d) 45 % 2 164,If the gas air mixture is compressed then the mixtures containing CH4.....is inflammable? (a) 1 % (b) 2 % to 75 % (c) 75 % to 90 % (d) above 90% 2 165,The atmosphere becomes non explosive irrespective of any % of firedamp if the minimum % of blackdamp is...? (a) 35 % (b) 25 % (c) 20 % (d) 50 % 1 166,The atmosphere is non explosive if the O2 percentage is? (a) below 12 % (b) 12 % to 20 % (c) 20 % to 40 % (d) 40 % to 50 % 1 167,Ignition temparature of methane is? (a) 250 - 350 deg c (b) 350 - 650 deg c (c) 650 - 750 deg c (d) 750 - 1000 deg c 3 168,If the CH4 and air mixture is at 1000 deg C then the delay for ignition is? (a) 20 sec (b) 10 sec (c) 5 sec (d) 1 sec 4 169,The amount of heat is required to burn the methane is ? (a) 15 kcal/mole (b) 19.5 kcal/mole (c) 22.1 kcal/mole (d) 25 kcal/mole 3 170,The time interval that elapses between applicatic of a source of heat to firedamp air mixture and the actual moment of ignition of gas air mixture is? (a) Incubation period (b) Lag on ignition (c) Ignition time (d) Graham's ratio 2 171,The delay eliminates completely if the H2 % in methane is? (a) 10 (b) 20 (c) 30 (d) 40 3 172,For coal dust explosion the quantity of coal is.....g/cu.m ? (a) 10 (b) 20 (c) 30 (d) 40 3 173,Lower limit of inflammability of coal dust is? (a) 1 gm/cc (b) 10 gm/cc (c) 5 gm/cc (d) 2000 gm/cu.m 1 174,The higher limit of inflammability of coal dust is? (a) 1 gm/cc (b) 10 gm/cc (c) 5 gm/cc (d) 2000 gm/cu.m 4 175,The lowest temparature at which a fine dry coal dust cloud can be ignited is ? (a) 250 - 350 deg C (b) 350 - 450 deg C (c) 450 - 650 deg C (d) 700 - 800 deg C 4 176,The coal is not likely to propagate flame for coal dust explosion if the coal containing of V.M ? (a) Less than 13 % (b) Less than 25 % (c) More than 25 % (d) More than 40 % 1 177,For every 1 % firedamp the additional stonedust is required for efficient stone dusting is? (a) 5 - 10 % (b) 10 - 14 % (c) 15 - 20 % (d) 20 - 30 % 2 178,The size of the coal dust particles dangerous to cause greater inflammability is ? (a) 1/5 - 1/10 mm (b) 1/10 - 1/15 mm (c) 1/2 - 1/5 mm (d) 1/1.5 - 1/2 mm 2 179,The amount of stone dust which must be added to the coal dust to make it non explosive is ? (a) Index of explosibility (b) Index of inflammability (c) Index idnitabolity (d) Index of wettablity 1 180,Stone dust used for dusting should not coantain.....free silica ? (a) more than 5 % (b) less than 5 % (c) more than 30 % (d) 5 to 30 % 1 181,The % of incombustable dust in the coal dust sample in a mine should be....... for t he stone to be effective inpreventing propagation of flame? (a) 10 - 20 % (b) 20 - 40 % (c) 40 - 50 % (d) 50 - 60 % 4 182,The quantity of moisture that would ensure non propagation of flame by coal dust atleat.....of the total mixture? (a) 1/3 (b) 1/10 (c) 1/30 (d) 1/50 3 183,The maximum air velocity preventing escape of moisture from the coal dust at conveyor roads is? (a) 8 m/s (b) 6 m/s (c) 4 m/s (d) 2 m/s 3 184,The maximum air velocity preventing escape of moisture from the coal dust at working faces is? (a) 8 m/s (b) 6 m/s (c) 4 m/s (d) 2 m/s 3 185,The stone dust barrier will fail if it located within minimum..... m from the face? (a) 30- 40 (b) 40 – 60 (c) 60 - 80 (d) 80 – 100 2 186,In light stone dust barriers the amount of stone dust is loaded is? (a) 60 kg/m (b) 40 kg/m (c) 30 kg/m (d) 20 kg/m 3 187,In heavy stone dust barriers the amount of stone dust is loaded is? (a) 60 kg/m (b) 40 kg/m (c) 30 kg/m (d) 20 kg/m 1 188,In bord and pillar method of mining the stonedust barriers are places.....m from the face? (a) 50 – 100 (b) 100 – 150 (c) 150 – 400 (d) 400 – 500 3 189,In longwall method the light type of stone dust barriers should be placed within the range of...... m from the nearest point of the face? (a) 50 – 120 (b) 150 – 200 (c) 200 – 350 (d) 350 - 400 1 190,In longwall method the heavy type of stone dust barriers should be placed within the range of...... m from the nearest point of the face? (a) 50 – 120 (b) 150 – 200 (c) 200 – 350 (d) 350 - 400 3 191,The water barriers must contain atleast...of water per sq.m of roadway cross section? (a) 50 Liters (b) 100 Liters (c) 150 Liters (d) 200 Liters 4 192,The distance between water barriers must no exceed....m in gate roads and.....m in main roads? (a) 100 ; 200 (b) 200 ; 400 (c) 300 ; 500 (d) 500 ; 600 2 193,The water barrier must be sited atleast.....m away from the stone dust barrier? (a) 100 (b) 200 (c) 300 (d) 400 1 194,In triggered barrier...... is used ? (a) Nitrogen (b) Ammonia (c) NaCl (d) Brine 1 195,Out of 21 % of oxygen in the atmosphere air that is inhaled by a person % of oxygen that is used from between inhalation and exhalation is? (a) 1 - 2 % (b) 2 - 3 % (c) 3 -5 % (d) 5 -7 % 3 196,The quantity of air inhaled per min at normal work is? (a) 8 – 10 (b) 15 – 20 (c) 30 – 40 (d) 40 – 50 3 197,The O2 consumption per min if person is walking ? (a) 0.3 - 0.4 lit (b) 0.6 - 0.9 lit (c) 1.3 - 1.8 lit (d) 1.8 - 2.3 lit 2 198,The self contained oxygen breathing apparatus is of the type? (a) Open circuit (b) Portable (c) Regenarative (d) Dependable 3 199,The capacity of the protomark Self contained breathing apparatus is? (a) 1 lit (b) 2 lit (c) 3 lit (d) 4 lit 2 200,Protomark apparatus contains....lit of oxygen with....kg/sq.cm pressure? (a) 100 ; 200 (b) 200 ; 400 (c) 300 ; 400 (d) 300 ; 150 4 201,The reducing valve in protomark SCBA reduces the pressure of O2 supplied to wearer is ? (a) 1 lit/min (b) 1.5 lit/min (c) 2 lit/min (d) 4 lit/min 3 202,The weight of CO2 abosorbant in a prototype breathing apparatus is? (a) 1 kg (b) 2 kg (c) 3 kg (d) 4 kg 2 203,The CO2 abosorbant used in prototype breathing apparatus is? (a) Calcium hydroxide and SOdium hydroxide (b) Calcium corbonate and caustic soda (c) sodium hydroxide and caustic soda (d) calcium hydroxide and castic soda 4 204,The protosorb keeps the % CO2 in the breathing circuit? (a) Below 2 % (b) 2 - 4% (c) 5 % (d) 6 % 1 205,The cooling agent in protosorb breathing apparatus is? (a) Calcium hydroxide (b) Sodium chloride (c) Sodium Phosphate (d) Methyle chloride 3 206,The cooling agent in the cooler is in crystal form at ordinary temperatures liquefies on usage of the apparatus by wearer at? (a) 28 deg C (b) 30 deg C (c) 32 deg C (d) 35 deg C 4 207,The duration of usage of protosorb SCBA is ? (a) 1/2 hour (b) 1 hour (c) 2 hour (d) 3 hour 3 208,Duration of use of Drager SCBA is ? (a) 1 hour (b) 2 hours (c) 3 hours (d) 4 hours 4 209,Drager SCBA contains....lit of O2 with a pressure.... kg/sq.cm? (a) 100 ; 200 (b) 200 ; 400 (c) 400 ; 200 (d) 300 ; 150 3 210,The oxygen feed rate in drager SCBA is ? (a) 1 lit/min (b) 1.5 lit/min (c) 2 lit/min (d) 3 lit/min 2 211,In drager SCBA the O2 feed to wearer's requirement over and above 1.5 lit/min is supplied by? (a) Bypass value (b) pressure guage valve (c) Lung govern valve (d) reducing valve 3 212,The duration of usage for chemical oxygen breathing apparatus is? (a) 1/2 hour (b) 1 hour (c) 2 hour (d) 3 hour 1 213,The chemical used in chemical breathing appratus is? (a) Calcium hydroxide (b) Sodium phosphate (c) potasium super oxide (d) potasium hydroxide 3 214,The most important constiuent in gas mask is? (a) charcoal (b) siliga gel (c) caustic (d) hopcolite 4 215,The condition to use gasmask is atmosphere should contain sufficient O2 to support life and should contain more than....% of CO? (a) 1 (b) 2 (c) 3 (d) 4 2 216,In gas mask silica gel is used ? (a) To remove dust and smoke (b) To remove ammonia and water vapour © COnverts CO to CO2 (d) To remove sulphuretted hydrogen 2 217,In gas mask caustic soda is used ? (a) To remove dust and smoke (b) To remove ammonia and water vapour © COnverts CO to CO2 (d) To remove sulphuretted hydrogen 4 218,The duration of usage of gas mask is? (a) 1/2 hour (b) 1 to 2 hours (c) 3 hours (d) 4 hours 2 219,In gas mask the use of charcoal is ? (a) To remove dust and smoke (b) To remove ammonia and water vapour © COnverts CO to CO2 (d) To remove organic vapours and acidic gases 4 220,The main function of self rescuer is? (a) To supply 2 lit/min oxygen to wearer (b) To convert Co to CO2 © To supply 30 lit/min of oxygen to wearer (d) none 2 221,The drying agent in self rescuer is? (a) calcium chloride (b) charcoal with calcium bromide and lithium chloride © Silica gelc (d) none 2 222,The smoke helmet or hose mask is used within a distance of? (a) 10 m from FAB (b) 25 m from FAB (c) 50 m from FAB (d) 100 m from FAB 3 223,The apparatus used to administer pure oxygen to an unconscious person or affected by noxious gasses is? (a) Smoke helmet (b) Reviving apparatus (c) Self rescuer (d) SCBA 2 224,In reviving apparatus the maximum O2 is supplied to person is? (a) 10 lit/min (b) 20 lit/min (c) 30 lit/min (d) 40 lit/min 3 225,A rescue brigade contains.....members? (a) 10 (b) 7 (c) 5 -6 (d) 3-4 3 226,Pulmotor is a ? (a) SCBA (b) Escaping apparatus (c) Reviving apparatus (d) None 3 227,Samples from the sealed off area taken when the pressure behind is? (a) Negative (b) Positive (c) 0 (d) either positve or negative 1 228,The main guide for taking decision to reopen a sealed off area is? (a) Temperature graph (b) Time elapsed (c) Graph of analysis of air samples (d) O2 deficiency 3 229,The fire is extinct in the sealed off area if the oxygen percentage is? (a) 12 % (b) 8 % (c) 6 % (d) 2 % 4 230,The relative amount of luminous energy given by any source of light is? (a) illumination (b) lux (c) intensity of light (d) lumen 3 231,Illumination is inversely proportional to ? (a) distance (b) square of distance (c) cube of distance (d) none 2 232,The unit of light emitted by a light source is? (a) Lumen (b) Lux (c) Candela (d) None 1 233,1 lumen/sq.m is? (a) Lumen (b) Lux (c) Candela (d) None 2 234,The unit of illumination in S.I units is? (a) Lumen (b) Lux (c) Candela (d) None 2 235,In u/g mines the purpose of white washing is? (a) To prevent coal dust explosion (b) To prevent spantaneous heating © To improve lighting (d) Both 2 and 3 4 236,The white washing is not done from the face upto ? (a) 400 m (b) 300 m (c) 100 m (d) 60 m 3 237,At 2m distance the illumination from lighe source of one candela is? (a) 4 metre candels (b) 2 metre candles (c) 8 metre candles (d) 0.25 candles 4 238,The minimum average lumens/sq.ft of light at pit bottom is? (a) 1.5 (b) 1.25 (c) 0.4 (d) 0.9 1 239,The minimum average lumens/sq.ft of light at roadways is? (a) 1.5 (b) 1.25 (c) 0.4 (d) 0.9 3 240,The minimum light required for reading and writing will be? (a) 10 lumen/sq.m (b) 10 lumen/sq.ft (c) 1 lumen/sq.m (d) 30 lumen/sq.m 1 241,The minimum light required in longwall working face is? (a) 2 lux (b) 5 lux (c) 10 lux (d) 12 lux 3 242,The flame safety lamp used for accumulation test is? (a) GL-5 (b) GL-50 (c) GL-60 (d) None 1 243,An electric cap lamp with krypton bulb gives and amount of light? (a) 15 lumens (b) 20 lumens (c) 30 lumens (d) 50 lumens 3 244,For depillaring area of gassy coal mines of II and III degree the amount duct of light in addition to cap lamp of individuals required to be provided is? (a) a cluster of 10 to 12 caplamps (b) a cluster of 15-20 caplamps © 250 watt bulbs 4 or more (d) none 2 245,The mesh size in flamesafety lamp is? (a) 30 (b) 20 (c) 10 (d) 5 2 246,The liquid used in GL-60 lamp is? (a) Petrol (b) Alcohol (c) Diesel (d) K-oil 4 247,The GL-60 flame safety lamp detects? (a) CO (b) CH4 (c) CO2 (d) Both 2 and 3 4 248,In the flame safety lamp should be discorded if the battery voltage is? (a) Below 5 (b) Above 5 (c) Below 2.3 (d) 2.3 to 5 3 249,The maximum battery voltage in flame safety lamp is? (a) 2 (b) 3 (c) 4 (d) 5 2 250,The battery in flame safety lamp can relight the lamp ? (a) 600 times (b) 700 times (c) 400 times (d) 300 times 1 251,The wire guage in flame safety lamp should have a total heat radiation area of not less than? (a) 400 sq.m (b) 355 sq.m (c) 250 sq.m (d) 155 sq.m 4 252,The percentage test will be conducted if the methane percentage is? (a) 1 to 2 % (b) 2 to 3 % (c) 3 % or more (d) Below 1 % 3 253,The minimum oxygen percentage required for supporting human life? (a) 12 % (b) 14 % (c) 16 % (d) 19 % 2 254,An electric cap lamp of acid type gives? (a) 1 V (b) 2 V (c) 4 V (d) 6 V 3 255,In the charged condition the specific gravity of the acid is ? (a) 1.26 (b) 1.18 (c) 1.81 (d) 1.62 1 256,The acid used in cap lamp is? (a) Sulphuric acid (b) Hydrocloric acid (c) Nitric acid (d) none 1 257,In the fully charged condition the active material in the positive plates is? (a) Lead (b) Antimony (c) Silicon (d) Lead peroxide 4 258,The gas produced in the electric cap lamp is? (a) Nitrogen (b) Oxygen (c) Hydrogen (d) Both 2 and 3 4 259,The life of the cap lamp in the pit is? (a) 300 hours (b) 400 hours (c) 500 hours (d) 600 hours 3 260,The illumination at the pitbottom is? (a) 20 to 40 lumens/sq.m (b) 15 to 20 lumens/sq.m © 40 to 60 lumens/sq.m (d) none 1 261,In electric lighting the power cannot be used at a voltage exceeding ? (a) 30 (b) 110 (c) 220 (d) 250 2 262,It is recommanded that the electric lamps should not be used within a distance of....from the longwall face? (a) 60 m (b) 80 m (c) 100 m (d) 270 m 3 263,The advantage of flourescent lamp in underground is? (a) More output (b) Reduce glare (c) Shall not produce shadow (d) All of the above 4 264,The life of the lead acid battery is? (a) 1 year (b) 2 years (c) 3 years (d) 4 years 2 265,The disease caused due to insufficient light is? (a) Nystagmus (b) Ankylostomiasis (c) Silicosis (d) Asbestosis 1 266,The disease caused due to working in insanitory working conditions by a thread like blood sucking worm which enters the body through the skin is? (a) Nystagmus (b) Ankylostomiasis (c) Silicosis (d) Asbestosis 2 267,The place is said to be dusty if the dust concentration is? (a) 1 mg/cu.m (b) 5 mg/cu.m (c) 10 mg/cu.m (d) 20 mg/cu.m 3 268,The disease caused to inhalation of iron dust is? (a) Ankylostomiasis (b) Silicosis (c) Asbestosis (d) Siderosis 4 269,The particles of silica measuring....microns in dia are most apt to produce damage? (a) 0.5 to 2.5 (b) 2.5 to 3 (c) 3 to 4 (d) 4 to 6 1 270,The diseased caused due to inhalation of hydrated magnesium silicate ? (a) Ankylostomiasis (b) Silicosis (c) Asbestosis (d) Siderosis 3 271,The diseased caused due to exposed to dusty atmosphere containing large amount of smoke? (a) Anthracosis (b) Ankylostomiasis (c) Silicosis (d) Asbestosis 1 272,The permitted content of silica dust in mine air should not exceed ? (a) 1 mg/cu.m (b) 2 mg/cu.m (c) 3 mg/cu.m (d) 4 mg/cu.m 2 273,Konimeter dust sampler uses the principle of? (a) Thermal precipitation (b) Gravity (c) Impingment i.e inertia precipitation (d) Optical method 3 274,P.R.U pump dust sampler uses the principle of? (a) Thermal precipitation (b) Impaction (c) Impingment i.e inertia precipitation (d) Scattering of light 4 275,The level of tolerence of noice is? (a) 20 to 50 dB (b) 50 to 70 dB (c) 70 to 85 dB (d) 90 to 110 dB 3 276,Personal protective equipment is required if the noise level is? (a) 80 dB (b) 90 dB (c) 125 dB (d) 140 dB 3 277,A worker should not allowed to enter without appropriate ear protection an area in which the noise level is? (a) 90 dB (b) 115 dB (c) 125 dB (d) 140 dB 2 278,No working should be done within a distance of.....from the water logged area or abondoned mine or disused workings? (a) 40 m (b) 50 m (c) 60 m (d) 100 m 3 279,In working of water logged area the gallery should not be more than? (a) 2.4m X 2.4m (b) 3m X 3m (c) 1.5m X 1.5m (d) 4.8m X 3m 1 280,When approach within 60 m from the probable old working place the boreholes should driven atleast ? (a) 5 m (b) 10 m (c) 15 m (d) 20 m 3 281,The interval of boreholes should not be more than.... while working near waterlogged workings? (a) 3 m (b) 5 m (c) 7 m (d) 10 m 2 282,The length of the bore hole should not be less than....while working near waterlogged workings? (a) 3 m (b) 5 m (c) 7 m (d) 10 m 1 283,VOLSAFE boring apparatus can drill holes upto.....depth? (a) 15 m (b) 50 m (c) 150 m (d) 250 m 3 284,While approaching a water logged area with safety boring apparatus an emergency shutoff door shall be built away from the site of boring machine at a distance of? (a) 10 m (b) 15 m (c) 20 m (d) 25 m 2 285,The thickness and height of the temparory dam ? (a) 0.5 m ; 1 m (b) 1 m ;1 m (c) 1 m ; 3m (d) 1 m ;2 m 1 286,The thickness of the permanant water dam is? (a) 3 m (b) 5 m (c) 6 m (d) 8 m 3 287,The electric cap lamp is? (a) Intrincically safe (b) Flame proof (c) Both 1 and 2 (d) Neither 1 nor 2 4 288,The flame of a flame safety lamp while testing for CH4 spires of jumps at the ? (a) 1 % (b) 2 % (c) 3 % (d) 5 % 3 289,Automatic detectors give either audio or visual alarm when the % of inflammable gas exceeds? (a) 0.5 % (b) 0.75 % (c) 1.25 % (d) 2 % 3 290,Tuberculosis is caused due to ? (a) Insufficient light (b) Inhalation of iron oxide dust (c) Inhalation of quartz dust (d) none 3 291,The method of dealing with fire in mine where heating is in the initial stages and its exact location is known is? (a) Digging out and extinguishing (b) Blanketing (c) Flooding (d) Sealing off 1 292,Spraying the surface with liquid cement sand mixture (1:3) in dealing with fire is known as? (a) Plastering (b) Sealing (c) Guniting (d) spraying 3 293,A stone dust barrier may fail to arrest an explosion if there is a....in roof of ther roadway over the barrier? (a) Layer of coal dust (b) timber support (c) Crack (d) Layer of methane 4 294,The holes drilled at different angles into sides while approaching water logged area is? (a) Advance bore holes (b) Prospecting holes (c) Flank holes (d) None 1 295,The ability to cause a flame to spread away form the source of ignition is called? (a) Index of explosibility (b) Index of inflammability © Index of ignitability (d) Graham's index 2 296,Where carbide lamps have to be used for safe working ther air velocity should not exceed? (a) 2.5 m/sec (b) 2.5 m/min (c) 5 m/sec (d) 5 m/min 1 297,In order to avoid permanent sulfating of the plates in lead acid battery the voltage of the lamp on usage must not be allowed to fall below? (a) 1.8 V per cell (b) 2.2 V per cell (c) 4.4 V per cell (d) 1.18 V per cell 1 298,The interval of time for igniting the fire damp air mixture at 650 deg C is ? (a) 1 sec (b) 5 sec (c) 10 sec (d) 30 sec 3 299,In self contained oxygen breathing apparatus the wearer can take more oxygen than he gets through the circuit by the ? (a) Main valve (b) Reducing valve (c) Relief valve (d) Byepass value 4 300,The shelf life of MSA methanometer is? (a) 6 months (b) 12 months (c) 18 months (d) 24 months 3 301,In metal mines a shaft is always sunk in? (a) Hanging wall (b) the mineral deposit (c) Across the deposit (d) foot wall 4 302,The roadways driven from the shaft from different horizons for access to the mineral deposit are? (a) Winzes (b) raises (c) levels or drifts (d) companion levels 3 303,The interval between levels depending on several points vary from? (a) 5 to 10m (b) 10 to 15 m (c) 15 to 100 m (d) 100 to 120 m 3 304,Level interval is more in the case of? (a) Ore bodies thicker (b) Thin ore bodies (c) moderately thick ore bodies (d) Thick ore bodies 2 305,As the haulage road has to be straight and wide with smooth curves it is in the? (a) Foot wall (b) Hanging wall (c) Ore body (d) Across the ore body 1 306,The mineral is transported downwards in different sextions to the lower level and all the ore is carried to crusher at lowest level through? (a) Mine tubs (b) Belt (c) Orepasses (d) Hoists of small capacity 3 307,The most common method of raising adopted in majority of metal mines is? (a) Compartment revising (b) Long hole drilling (c) Drop raise (d) Open raising 4 308,The method of raising suitable for moderate lengths and inclination of 40 to 60 deg with horizontal with strong strata and wall rock is? (a) Open raising (b) Compartment raising (c) Longhole raising (d) Alamak raiser 1 309,Two or three compartment raising is limited to? (a) 10 to 15m (b) 15 to 20 m (c) 20 to 25 m (d) 25 to 30 m 2 310,Raising by longhole drilling is limited to? (a) 10 to 15m (b) 15 to 50m (c) 50 to 100m (d) 100 to 120m 2 311,Alamak raise climber can be used only where inclination of the raise from horizontal is? (a) 10 deg (b) 20 deg (c) 30 deg (d) 40 deg 4 312,In manual method of raise driving the monthly progress is nearly? (a) 10 m (b) 15 m (c) 25 m (d) 40 m 1 313,The open raising is limited to? (a) 6 m (b) 8 m (c) 12 m (d) 20 m 2 314,In vertical crater retreat method the spherical charges are used L:D should not exceed is? (a) 1:4 (b) 4:1 (c) 6:1 (d) 1:6 3 315,Open stope method is used for ore of? (a) High grade (b) Low grade (c) Weak (d) Strong 2 316,The piller left to support the upper level is called? (a) Sill piller (b) Crown piller (c) Rib piller (d) Protective piller 2 317,The thickness of the bed in open stoping is? (a) 2 to 3 m (b) 4 to 6 m (c) 7 to 10m (d) above 10m 1 318,The method of stoping best suited to low grade deposits of horizontal or mild dip and of thickness upto 5m is? (a) Open stoping (b) Breast stoping (c) Sublevel stoping (d) Shrinkage stoping 2 319,Breast stoping is employed for stoping ore bodies not more than? (a) 1 m (b) 8 m (c) 12 m (d) 15 m 3 320,Among the methods of open stoping method lends to large scale mechanization in drilling ; blasing ;loading and transporing is? (a) Rill stoping (b) Breast stoping (c) Overhand stoping (d) Underhand stoping 2 321,The method of stoping suitable for thick ore body strong ore stable handing and foot wall steeply dipping ore is? (a) Open stoping (b) Shrinkage stoping (c) Cut and fill stoping (d) Sublevel stoping 4 322,The method of stoping suitable for thin ore bodies flat dip and both ore and walls are strong is? (a) Sublevel stoping (b) Top slicing (c) Longwall (d) Room and piller mining 4 323,The maximum thickness of the ore body that can be worked with room and piller method is? (a) 2m (b) 6m (c) 10m (d) 12m 4 324,The method of stoping where the orebody is thick veins type ore and walls are strong and steeply dipping ore i.e footwall steeper than angle of repose of the broken ore is? (a) Open stoping (b) Shrinkage stoping (c) Cut and fill stoping (d) Sublevel stoping 2 325,The method of stoping suitable for steeply dipping reasonably firm ore mixed graded ore with irregular boundaries and where ground surface is to be protected from subsidence is? (a) Open stoping (b) Shrinkage stoping (c) Cut and fill stoping (d) Sublevel stoping 3 326,Recovery of ore by shrinkage stoping is? (a) 40 to 50 % (b) 50 to 60 % (c) 60 to 75 % (d) 75 to 90 % 4 327,To maintaing suitable working space for workings the muck pile is shrinked in the shrinkage stoping is? (a) 20 % (b) 30 % (c) 40 % (d) 50 % 3 328,The method of stoping for high grade ore with walls of the ore body and back of the stope are so weak which do not stand without support even for a week time is? (a) Sublevel stoping (b) Shrinkage stoping (c) Squareset stoping (d) cut and fill stoping 3 329,The method of stoping for narrow and steeply dipping ore with any type of ore and walls is? (a) Square set (b) Top slicing (c) Resuing (d) Cut and fill 3 330,The method of stoping for massive ore bodies with walls and ore are weak and low grade ore is? (a) Sublevel stoping (b) Cut and fill stoping (c) Block caving (d) Shrinkage stoping 3 331,The method of stoping for massive ore bodies of high grade ore with walls and ore are weak and the ore is mined out in a series or horizontal slices from the top of the orebody? (a) Top slicing (b) Block caving (c) Squareset stoping (d) Sublevel stoping 1 332,The dilution in sublevel caving is? (a) 10 to 35 % (b) 35 to 45 % (c) 45 to 60 % (d) above 60 % 1 333,The length of the back if the dip of the ore is 30 deg? (a) 55 m (b) 38 m (c) 45 m (d) 75 m 4 334,The method of stoping succesfully applied to all dips from horizontal to vertical is? (a) Rill stoping (b) Breast stoping (c) Overhand stoping (d) Underhand stoping 2 335,The limiting gradient of the slusher haulage is? (a) 20 deg (b) 30 deg (c) 45 deg (d) 60 deg 3 336,The method of stoping is applied for massive deposits of large horizontal extent is? (a) Top slicing (b) Cut and fill stoping (c) Block caving (d) Shrinkage stoping 3 337,The daily progress of raise by Alamak climber is? (a) 10 m (b) 25 m (c) 30 m (d) 40 m 2 338,Extraction of the ore minerals mechanically or hydraulically from floating vessals is known as? (a) Placer mining (b) Marine mining (c) Leaching (d) Dredging 4 339,The distance between levels on the plane of the orebody is called? (a) Length of back (b) Level interval (c) Horizontal interval (d) None 1 340,The process which involves reacting the ore with liquid solvent that will dissolve the mineral at low or moderate temparature and pressure is called? (a) Pyrometallurgical (b) Hydrometallurgical (c) Bio leaching (d) none 2 341,In drypowder extinguiser which chemical is used? (a) Soda bicarbonate (b) Mono ammonium phosphate (c) corbon tetra chloride (d) B.C.F 2 342,Overburden heaps should be atleast....m away from the coal face of a quarry? (a) 5 m (b) 10 m (c) 15 m (d) 20 m 3