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GATE Mining Engineering Mcq

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1. In the Coward flammability diagram, the respective percentages of methane and oxygen at the nose limit are




2. If the transpose of a matrix is equal to its inverse, then the matrix is




3. In the Moh's scale of hardness, the minerals in increasing sequence of hardness are




4. In the Moh's scale of hardness, the minerals in increasing sequence of hardness are




5. For a 25 mm diameter spherical charge, the maximum allowable charge length in cm is




6. Long-hole drilling with crater blasting is used for the construction of




7. Rill stoping method is a form of




8. Transit theodolite is a




9. Incubation period is NOT related to




10. The pressure on a phreatic surface is




11. Events A and B are independent but NOT mutually exclusive. If the probabilities P(A) and P(B) are 0.5 and 0.4 respectively, then P(A ∪ B) is




12. Among the following options, the specific energy for rock-drilling is lowest in




13. An emulsion explosive of specific gravity 1.25 is used for blasting in an iron ore formation having P-wave velocity of 3000 m/s and specific gravity of 3.20. For an explosive impedance to rock impedance ratio of 0.5, the desired velocity of detonation of the explosive in m/s is




14. The number of ways in which the letters in the word MINING can be arranged is




15. Under standard temperature and pressure conditions the theoretical maximum height in m to which water can be lifted using an air-lift pump is




16. In a belt conveyor system, function of the snub pulley is to




17. Two meshing spur gear wheels of Module 6 have 24 and 42 teeth. The distance in mm between the centres of the gear wheels is




18. In an experiment to study coal dust explosibility, it is found that at least 3.0 g of limestone dust should be added to a sample of 2.0 g of coal dust to ensure that propagation of flame does not take place. The explosibility factor of coal dust is




19. A 20 m steel tape used in a mine survey is found to be 20 cm short when compared with a standard tape. If the measured volume of a dump using the tape is 4000 m3, its actual volume in m3 is




20. A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O2 and 3.83% CO2. The respiratory quotient of breathing for the worker is




21. The boundary of a mine is plotted on a scale of 1:2000. If a planimeter measures the plotted area as 58 cm2, the actual mine area in m2 is




22. For a shrinkage stope the following data values are given Insitu tonnage 9000 tonne Insitu grade 5.2 g/tonne Average grade of waste 1.4 g/tonne Loss of ore in the stope 10% Dilution 20% The grade at the mill-head in g/tonne is ________




23. In an experiment to determine specific gravity of a soil sample, the following data is obtained: Mass of empty pycnometer 20.4 g Mass of pycnometer with soil sample 51.6 g Mass of pycnometer with soil sample filled with water 88.6 g Mass of pycnometer filled with water 70.4 g The specific gravity of the sample is __________




24. A cylindrical rock specimen of diameter 54 mm has Young's modulus of 68.97 GPa and Poisson's ratio of 0.35. The rock specimen fails in uniaxial compression at a lateral strain of 0.01%. The axial load at failure in kN is __________




25. A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes ____________




26. A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes ____________




27. A core sample of a rock, having diameter 54 mm and length 108 mm, is subjected to axial loading. If the axial strain and Poisson's ratio are 2000 * 10-6 and 0.28 respectively, the value of volumetric strain , represented in micro-strain is ___________




28. A bucket wheel excavator with 20 buckets of capacity 0.5 m3 each, rotates at 5 rev/min. The bucket fill factor is 80%. The excavator loads on to 1200 mm wide belt conveyor. The cross-section area (m2) of the material on the belt is 0.1B2, where B is the belt width in m. The minimum speed of the belt in m/s to avoid spillage of material is




29. Given the following, Machine Component P. Dint header 1. Cowl Q. Coal plough 2. Cutting chain R. Road header 3. Loading apron S. Shearer 4. Static set of bits the correct match is




30. Given the following, Equation/formula/law Application P. Bernoulli equation 1. Pressure loss in laminar flow of fluid Q. Poiseuille equation 2. Drag loss due to regular obstructions in fluid flow R. Bromilow's formula 3. Energy conservation in ideal fluid flow S. Stokes law 4. Terminal settling velocity of fine particles in fluid the correct match is




31. Given the following differential equation d2y/dx2 + 7 dy/dx + 12y = 0 the general solution is




32. Given the following, Mining method Technique P Thick seam extraction 1 Double unit face Q Bord and pillar extraction 2 Jet cutting R Longwall face development 3 Inclined slicing S Hydraulic mining 4 Half moon method the correct match is




33. Given the following, Excavating/loading machine Transportation scheme P Bucket Wheel Excavator 1 Mine tub Q Continuous Miner 2 Armoured flexible chain conveyor R Shearer 3 Shiftable Conveyor S Load Haul Dumper 4 Shuttle car the correct match is




34. Given the following, Excavating/loading machine Transportation scheme P Bucket Wheel Excavator 1 Mine tub Q Continuous Miner 2 Armoured flexible chain conveyor R Shearer 3 Shiftable Conveyor S Load Haul Dumper 4 Shuttle car the correct match is




35. The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria the maximum principal stress at failure in MPa is (consider rock constants as m = 7.88, s = 1.0 and a = 0.5)




36. A wire of length L is cut into two pieces to construct a circle and an equilateral triangle such that the combined area is minimum. The length of the wire used to construct the circle is




37. Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. The mine quantity in m3/s is




38. Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. An identical fan is installed in the mine to operate in series with the existing fan. The new mine quantity in m3/s is




39. A 4.6 m wide vein dipping at 800 is mined by horizontal cut-and-fill stoping method. The fill is to be placed in the stope along the length of 46 m and to a height of 3.0 m. If the specific weight of the fill material is 15.86 kN/m3 and the porosity is 35%, under fully saturated conditions the volume of water in the fill in m3 is




40. A 4.6 m wide vein dipping at 800 is mined by horizontal cut-and-fill stoping method. The fill is to be placed in the stope along the length of 46 m and to a height of 3.0 m. If the specific weight of the fill material is 15.86 kN/m3 and the porosity is 35%, under fully saturated conditions the mass of solids in saturated fill in tonnes is




41. All engineering students should learn mechanics, mathematics and how to do computation. I II III IV Which of the above underlined parts of the sentence is not appropriate? I, II, III Iv




42. Select the pair that best expresses a relationship similar to that expressed in the pair: water: pipe::




43. Velocity of an object fired directly in upward direction is given by V = 80 - 32 t, where t (time) is in seconds. When will the velocity be between 32 m/sec and 64 m/sec?




44. In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a randomly drawn autocomponent from the combined lot is found defective, what is the probability that it was manufactured by M2?




45. If |-2X + 9| = 3 then the possible value of |-X| - X2 would be:




46. All professors are researchers Some scientists are professors Which of the given conclusions is logically valid and is inferred from the above arguments: