Mining objective
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This document contains 61 multiple choice questions related to mining engineering. The questions cover topics such as blasting, explosives, ventilation, safety, surveying, geology and mining methods. Correct answer options are provided for each question. The purpose seems to be to test knowledge of key concepts and terminology in mining engineering.
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Mining objective
- 1. Mining Engineering Q1. Which cut is used for solid blasting in Indian coal Mines a) Fan cut b) burn cut c) wedge cut d) drag cut Q2. Permitted explosives are safe to use because a) They have less strength b) they have low velocity of detonation c) they do not produce much noise during blasting d) special chemical are used to extinguish the spark produced during blasting. Q3. Burden is the distance between a) Two blast holes in same row b) distance between two rows c) distance between first row of blast holes and bench d) none of the above Q4. Which of the following explosive have maximum strength a) ANFO b) TNT c) RDX d) Nitroglycerine Q5. To measure the performance of blasting which factor is calculated a) Tonnage factor b) space factor c) stripping ratio d) Powder factor Q6. What is the formula for blast ability? a) B = c / t b)B= t / c c) B = c + t d ) B = c X t Where B = Blast ability c = compressive strength t = tensile strength of a rock Q7 As per provision of regulation 170 (1a)(b) of CMR 1957 danger zone is an area falling a radius of -------- a) 100 m b) 150 m c) 200m d) 300m Q8 While blasting in hot strata the temperature of hole should not exceed a) 50 c b) 60 c c) 70 c d) 80 c Q9 Fly rocks during opencast blasting is controlled by a) Pop shooting b) Plaster shooting c) muffled blasting d) overcharging Q10 While dealing with Misfire shot the relieving hole is drilled at a distance not less than a) 10 m b) 20m c) 30 m d) 40 m Q11 As per CMR the recapping of rope is done once at least in every a) 3 month b) 4 months c) 6 months d) 1 year. Q12 what is the maximum angle of fleet is permissible in winding as per CMR a) 1 b) 1.5 c) 2 d) 2.5
- 2. Q13 a coal seam is said to be of degree III if rate of emission of gas in m3 /te of coal raised is a) is equal to 10 b) less than 10 c) more than 10 d) in between 1 to 10 Q 14 reportable injury means any injury other than serious bodily injury, which involves the enforced absence of injured person from work for a period of a) 24 hours or more b) 36 hours or more c) 48 hours or more d) 72 hours or more Q15 When the air and mineral flow is in same direction the ventilation is known as a) Homotropal ventilation b) antitropal ventilation c) boundary ventilation d0 natural ventilation Q16 Roof falls are more common if the face is at a) Right angles to the main cleat b) Parallel to the main cleat c) 60 degrees to the main cleat d) None of the above Q17 A seam is worked at a depth of 70 mtrs . from surface and the width of the galleries is 3.2 mtr the dimension of the pillar should not exceed a) 15.0 mtrs b) 16.5 mtrs c) 19.5 mtrs d) 13.5 mtrs Q18 In board and pillar panel worked in conjunction with hydraulic stowing extraction line preferred is a) Step diagonal b) Diagonal c) Steep diagonal d) Straight Q19 emulsion explosive is mixture of a) Ammonium nitrate, TNT, NG b) Ammonium nitrate, TNT, guar gum c) Ammonium nitrate, NG , water
- 3. d) Ammonium nitrate, water, hollow microballons Q20 Coalfication has taken place in order of a) Peat. Lignite, bituminous, anthracite b) Lignite, peat, bituminous, anthracite c) Peat, lignite, anthracite, bituminous d) Bituminous, peat, anthracite, lignite Q21 coal seams are normally found in a) Sedimentary rocks b) Igneous rocks c) Metamorphic rocks d) Any type of rocks Q22 In India a coal seam is defined as a thick coal seam if its thickness is a) 3m or more b) 3.5 m or more c) More than 4.8m d) 2.5m or more Q23 black damp is a mixture of a) CO2 + N2 b) CH4 + CO c) CO + CO2 d) O2 + H2S Q24 When working approaches waterlogged areas apparatus used as precautionary measure is a) Diamond drilling b) Burn side boring c) Jackhammer drilling d) Chilled shot drilling Q25 keps are used in a) Koepe winding b) Direct haulage c) Endless haulage d) Drum winding
- 4. Q26 Chasnala mine disaster is due to a) Fire b) Inundation c) Explosion d) Noxious gases Q27 permissible dust concentration in Indian mines is a) 3mg/m2of air b) 4mg/m2of air c) 3.5mg/m3 of air d) 5mg/m2 of air Q28 Factor of safety for winding rope is a) 10 b) 15 c) 5 d) 7.5 Q29 Life of winding rope is a) 4.5 years b) 14 months c) 2 years d) 3.5years Q30 Runaway switch is used in a) Rope haulage b) Winding c) Belt conveyor d) Aerial ropeway Q31 The purpose of wire gauge in flame safety lamp is a) To prevent the passage of flame from inside to the outside of the lamp b) To prevent the passage of CH4 from outside to the inside of the lamp c) To disperse the combustion gases uniformly d) For proper circulation of air current Q32 the hopkalite used in CO detector is a mixture of MnO2 and a) Lead oxide b) Copper oxide c) NaCl
- 5. d) Silica gel Q33 Self-rescuer can be used upto ________ % of CO a) 2 b) 3 c) 1.5 d) 2.5 Q34 According to CMR 1957 CH4 % in return airway should not exceed a) 1% b) 1.75% c) 0.75% d) 1.25% Q35 the wet bulb temperature in development faces should not exceed a) 33 C b) 32.5 C c) 33.5 C d) 30 C Q36 In contiguous seams means the parting between two seams is within a) 10m b) 9m c) 15m d) 20m Q37 which of the following instruments is used to measure the cooling power of the air a) Anemometer b) Velometer c) Manometer d) Katathermometer Q38 Joining of two ropes is called as a) Splicing b) Capping c) Interlocking d) Gassing
- 6. Q39 Clifton pulley is used in a) Direct rope haulage b) Main and tail rope haulage c) Gravity haulage d) Endless rope haulage Q40 when shot hole is blasted at a quarry face, fracture of rock takes place by a) Compression shock wave b) Reflected shock wave c) Both by compression and tensile e) By gas pressure Q41 The minimum accuracy of colliery triangulation survey is aimed at a) 1 in 5000 b) 1in 7000 c) 1in 10000 d) 1 in 15000 Q42 fast and accurate extension of centerlines in long tunnels can be done by a) Miners dial b) Theodolite c) Laser beam ranger d) Strings with chalk marks Q43 Mechanized opencast mining in India is economically feasible at present if the overburden to coal ratio is approximately upto a) 1in2 b) 1in 4 c) 1in 8 d) 1in10 Q44 for overburden removal with shovel dumper combination the optimum size of the dumper depends on a) The distance of the haul b) Size of the shovel c) Size of the shovel and the distance of haul d) Tonnage to be handled Q45 In an underground coal mine the place where explosive is stored in underground is called as
- 7. a) Reserve station b) Shelter c) Magazine d) None of the above Q46 for heavy duty crushing on hard material the type of jaw crusher normally selected is a) Blake type double toggle b) Dodge type c) Single toggle type d) None of the above Q47 To separate two finely divided solids from one another the process to be selected is a) Floating b) Washing c) Jigging d) None of the above Q48 A Zn deposit is formed by a geological process is called a) Hydrothermal b) magmatic separation c) supergene d) None of the above Q49 cut and fill stoping can be operated a) Underhand only b) Overhand only c) Both underhand and overhand d) None of the above Q50 If the RQD of the ore and wall rock are low the method of stoping selected will be a) Shrinkage b) Sublevel caving c) Block caving d) Cut and fill Q51 the stoping method in which maximum cost is incurred is a) Square set stoping b) Cut and fill stoping c) Shrinkage stoping
- 8. d) Sublevel stoping Q52 In the panel caving system of block caving the contact between the ore and capping is kept a) Horizontal b) Inclined c) Vertical d) None of the above Q53 The ventilation plan of a mine should be on a reference scale of a) 1000: 1 b) 1200: 1 c) 2000:1 d) 1500:1 Q54 In any working below ground there should be provided at least two shafts or incline which should be away from each other by a minimum distance a) 12.5 mtrs b) 13.5 mtrs c) 14.5 mtrs d) 15.4 mtrs Q55 Poisson ratio is a relationship between a) Longitudinal stress and lateral stress b) Longitudinal strain and lateral stress c) Longitudinal stress and internal strain d) Longitudinal strain and lateral strain Q56 RQD is a quantitative index based on core recovery procedure which is determined by incorporation of only those pieces of core that are a) Less than or equal to 100mm b) Greater than or equal to 100mm c) Less than or equal to 125mm d) Greater than or equal to 125mm Q57 In a contoured Map if there are higher values in side the loop it indicates a) Ridge b) Valley c) Plane land d) None of the above
- 9. Q58 The intersection of a vertical line through the observer’s station with the upper portion of the celestrial sphere is called a) Nadir b) Ceriestrial horizon c) Zenith d) None of the above Q59 the effect of curvature in leveling is an error, which is a) Subtractive b) Additive c) Multiplicative d) None of the above Q60 The minimum accuracy of colliery triangulation survey is aimed at a) 1in 5000 b) 1in 7000 c) 1in 10000 d) 1in 15000 Q61 The earliest indication of the spontaneous heating of coal can be given by a) Sweating of strata b) Make of CO2 c) Temperature rise d) None of the above Q62 In an underground coal mine ventilated by 100 HP fan (Air HP) it is required to double the quantity of air for the purpose of air HP required will be a) 200 H.P b) 400 H.P c) 800 H.P. d) 600 H.P. Q63 Ore for metal lead is a) Galena b) Sphalerite c) Graphite d) Pyrite Q64 DGMS comes under a) Mines Ministry
- 10. b) Labor Ministry c) Ministry of Coal d) Law Ministry Q65 lily controller is used for the protection in winder a) Over wind b) Over speed c) Over current d) Over load Q66 balance rope is used on Koepe friction winder a) To increase the weight of load b) To connect cage and counter weight c) To balance winding rope d) To balance cage winding rope and to reduce power consumption Q67Factor of safety (FOS) in connection with winding a) Assumes a constant value b) Varies with respect to time c) Applicable to dynamic loading d) Applicable to static loading Q68 LHD is a a) Loading machine b) Hauling machine c) Dumping machine d) Loading, hauling and dumping machine Q69 the shape of the casting in a centrifugal pump is a) involute b) Circular c) Cylindrical d) Conical Q70 Magnetic separation is a) A dry method b) An wet method c) Combination of two d) None of the above
- 11. Q71 Notice to regional inspector of mines about occurrence of serious accident is given in form a) IV A b) IV B c) IV C d) IV D Q72 Blasting Gallery method is not suitable for working seam thickness a) Less than 7 m b) More than 7m c) Up to 11m d) More than 11m Q73 The size and speed of rotation being the same the head developed is max in case of a) an Arial flow fan b) a backward bladed centrifugal fan c) a radial bladed centrifugal fan d) a forward bladed centrifugal fan Q74 In water gas explosion the two highly explosive gases that are involved are a) H2 and CO b) N2 and CO c) H2 and CO2 d) O2 and CO Q75 In an underground working area CH4 and CO2 are normally expected to be found respectively a) Near the floor and along the the roadway b) Near the floor and near the roof c) Near the roof and near the floor d) Along the roadway and near the floor Q76 The most important parameter of a dust that governs its physiological effect is a) Concentration of dust in air b) Shape of dust c) Time of exposure d) Size of dust Q77 In a mine a big roof fall has taken place in the mine intake place in main intake airway. The fan drift water gauge a) Will remain unaffected
- 12. b) Will register an increase c) Will decrease d) Will increase temporarily only when fall takes place Q78 Stone dust barriers are installed in underground a) To prevent the imitation of coal dust explosion b) To prevent imitation of firedamp explosion c) To act as the storage of stone dust d) None of the above Q79 60 dB + 60dB a) 120 dB b) 3600 dB c) 63 dB d) 36 dB Q80 In ventilation network analysis, kirchhoff’s first law is used which states a) The pressure loss in a closed mesh is zero b) The algebraic sum of quantitities flowing at a junction is zero c) The resistance of an airway varies with the square of the air velocity d) None of the above Q81 Atkinson’s equation P = RQ2 is applicable for a) Laminar flow only b) Fully turbulent flow only c) Leakage paths only d) All of the above Q82 NVP in a mine is more in a) Summer as the air going in is hot b) Winter as the air going in is cold c) Rainy season as the air going in is moist d) Do not vary with season Q83 Reynolds number varies a) Inversely with flow velocity b) Directly with flow velocity c) Directly with square of flow velocity d) Does not vary with velocity flow
- 13. Q 84 Resistance of a mine airway does not depend upon a) Its length b) Its cross section c) Quantity of air flowing in it d) Its coefficient of friction Q85 An electric cap lamp as used in mine has a fuse of capacity a) 1 amp b) 2 amp c) 3 amp d) 4 amp Q86 A 10% increase in cross sectional area of a roadway will reduce the resistance approximately by a) 10% b) 20% c) 30% d) 40% Q87 The recommended instrument for the air borne respirable dust sampling in the Indian mines is a) CLP-10 b) Konimeter c) RAM-I d) NCB/MRE-113A Q88 The oxygen concentration in underground mine should not be less than a) 20.93% b) 20% c) 19% d) 18% Q89 the thickness of ventilation stopping should not be less than a) 27 cms b) 38 cms c) 35 cms d) 47 cms Q90 A cap lamp must be able to produce an illumination of
- 14. a) 0.25 lumans b) 0.25 lux c) 0.25 candlas/m2 d) 0.25 foot candlas Q91 Gravimetric dust samplers works on the principals of a) Filtration b) Thermal precipitation c) Optical d) Impaction Q92 carbon monoxide detector tubes uses a) PETN b) Protosorb c) Hopcolite d) Potassium palladium sulphate Q93 Installation of booster fan in one district a) Reduces the flow of air in other district b) Increases the flow of air in other district c) Reduces the resistance of other district d) None of the above Q94 Pitot tube is generally used for a) Measurement of air velocity in mine air b) Measurement of air pressure c) Measurement of air velocity in ducts d) None of the above Q95 Gas chromatography utilizes the principal of a) Sonic velocity b) Refractive index c) Solid gas absorption d) Optical Q96 Explosibility of coal dust generally does not depends on a) Fineness of dust b) Composition of dust c) Presence of methane in air d) Colour of dust
- 15. Q97 For measuring relative humidity we use a) Anemometer b) Velometer c) Psychrometer d) Manometer Q98 Geothermal gradient in Indian coal fields is about a) 10C/ 20m b) 10C/ 92m c) 10C/ 38m d) 10C/ 72m Q99 A drum Shearer is mounted on a) Its own skid b) Separate rail c) A.F.C. d) Support frame Q100 Dust generation may be reduced by drilling a) low RPM b) Sharp bit c) High RPM d) Low Thrust **************************************************************