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Question Text: In India a coal seam is termed as "Thick Seam" when its thickness is equal to or more than _______ m. Options: (1) 2. (2) 3 (3) 3. (4) 4. (5) 4. Correction Answer : Option No. (5) Question Text: If a shaft is more than ___________ m in depth, arrangements shall be by mechanical means for persons to descend and ascend. Options: (1) 20 (2) 25 (3) 30 (4) 40 (5) 50 Correction Answer : Option No. (3) Question Text: RMR is predominantly used for estimation of rock load and design of the support system for __________ in underground coal mines. Options: (1) Goaf edges (2) Development roadways in coal seam (3) Depillaring district (4) Shaft sinking (5) Splits & slices Correction Answer : Option No. (2) Question Text: In favorable geomining condition, for high production and high productivity mechanised mining of flat to gently dipping, 1.5 to 4.5 m thick coal seams, the most suitable method is __________ Options: (1) Bord & Pillar Mining (2) Blasting Gallery Method (3) Room & Pillar Mining (4) Knife Edge Method (5) Longwall Mining Correction Answer : Option No. (5) Question Text: Friction prop is a _______________ type of support.
Options: (1) rigid (2) yielding (3) tangential (4) diagonal (5) flat Correction Answer : Option No. (2) Question Text: The type of permitted explosive used for off-the-solid blasting in coal mines is ____. Options: (1) P (2) P (3) P (4) P (5) P Correction Answer : Option No. (5) Question Text: At _______________ width-depth ratio of goaf in underground, it causes maximum possible subsidence at more than one point in the overlying ground surface. Options: (1) Marginal (2) Sub-critical (3) Critical (4) Super-critical (5) Nominal Correction Answer : Option No. (4) Question Text: The subsidence that continues to occur after the completion of depillaring is known as ___________ subsidence. Options: (1) critical (2) nominal (3) sub-critical (4) residual (5) critical Correction Answer : Option No. (4) Question Text: Proneness to spontaneous heating is high in the following crossing point temperature range- Options: (1) 120° to 140° (2) 140° to 155° (3) > 155° (4) 100° to 120°
Options: (1) 1.5 m (2) 2.5 m (3) 3.5 m (4) 4.5 m (5) 5.5 m Correction Answer : Option No. (1) Question Text: Choose the correct statement. Options: (1) Areas having frequent geological disturbances are not suitable for Mechanised bord and pillar mining (2) Blasting Gallery method is suitable ideally for gassy seams of degree III (3) Mechanised board and pillar mining is not suitable for seams having inclination less than 15° (4) Mechanised longwall mining is not suitable for seams having inclination less than 15° (5) Areas having frequent geological disturbances are suitable for mechanised bord and pillar mining Correction Answer : Option No. (1) Question Text: Every plan and section prepared in accordance with the provisions of CMR, 1957 shall show a scale of the plan at least __________. Options: (1) 10 cm long and suitably sub- divided. (2) 25 cm long and suitably sub- divided. (3) 15 cm long and suitably sub- divided. (4) 20 cm long and suitably sub- divided. (5) None of the Options Correction Answer : Option No. (2) Question Text: Shaft location is best done on the basis of_________. Options: (1) Depth of the coal seam (2) Production per year (3) As per convenience (4) Haulage effort (5) Inclination of the seam Correction Answer : Option No. (4) Question Text: Smooth blasting for inter-seam drifting is a technique for___________. Options: (1) Production blasting (2) Reducing overbreak (3) Improving pull
(4) Reduce fly rock (5) Crater blasting Correction Answer : Option No. (2) Question Text: NONEL helps in reducing________. Options: (1) Fly rock (2) Explosive desensitization (3) Ground vibration (4) Air vibration (5) None of the Options Correction Answer : Option No. (2) Question Text: Shovel-dumper sizing is done on the basis of_________. Options: (1) Pay back period (2) Net present value (3) Total profit (4) Depreciation (5) All the Options Correction Answer : Option No. (2) Question Text: Which of the following factor is considered for calculation of cycle time of excavating machine? Options: (1) Swell Factor (2) Bucket factor (3) Drill factor (4) Swing Factor (5) None of the Options Correction Answer : Option No. (4) Question Text: In an opencast coal mine, bench failure has occurred in which a triangular portion has come out. The type of failure is_________________. Options: (1) Curved failure (2) Wedge failure (3) Toppling up (4) Linear failure (5) Triangular failure Correction Answer : Option No. (2) Question Text: Testing of parking brake of a dumper is done _________.
(4) Driving galleries in coal seam (5) Construction of chutes Correction Answer : Option No. (3) Question Text: The workings of two underground mines each having 4.8 m gallery width at 100 depth must be separated by a minimum distance of ________ m. Options: (1) 16.5 m (2) 19.5 m (3) 22.5 m (4) 25.5 m (5) 30.5 m Correction Answer : Option No. (4) Question Text: In underground mines stress cells or stressmeters are used to measure _________. Options: (1) in situ stress in mine (2) load on breaker line props (3) induced stress in pillars (4) closure between roof and floor (5) convergence Correction Answer : Option No. (3) Question Text: Mercury fulminate is used _______________ Options: (1) in detonators (2) as additive to sensitize explosives (3) in detonating cords (4) in secondary explosives (5) in high explosives Correction Answer : Option No. (1) Question Text: Fuse head of electronic detonators are placed ___________________________. Options: (1) before delay element (2) after delay element (3) outside blast hole (4) near exploder (5) None of the Options Correction Answer : Option No. (2) Question Text: Decoupled charging results in ___________________________________.
Options: (1) poor fragmentation but less vibration (2) better fragmentation and less vibration (3) better fragmentation but more vibration (4) poor fragmentation and high vibration (5) better fragmentation and higher noise Correction Answer : Option No. (2) Question Text: Unit of blast induced vibration is ______________. Options: (1) mm/s (2) Pascal (3) dB (4) Nm (5) m/min Correction Answer : Option No. (1) Question Text: ______________ is the smallest absolute value of a parameter that can be measured by a monitoring instrument. Options: (1) Sensitivity (2) Least Count (3) Accuracy (4) Reliability (5) Repeatability Correction Answer : Option No. (2) Question Text: Factor of safety of slope of an opencast mine _____________ with increase in pore water pressure. Options: (1) goes up (2) reduces (3) remains unchanged (4) fluctuates (5) loses importance Correction Answer : Option No. (2) Question Text: Safe limit of tensile strain in forest land is ___ mm/m as per the guidelines of the Ministry of Environment & Forests. Options: (1) 3 (2) 7
Options: (1) USBM deformation gauge (2) Hollow inclusion stress meter (3) Door stopper (4) contact load cell (5) Tell tale Correction Answer : Option No. (2) Question Text: Which is not true in case of a shock tube initiating system, such as NONEL? Options: (1) Needs detonators for initiation (2) Can be used under watery conditions (3) Not affected by static electricity or strong current (4) Creates a lot of noise (5) True bottom hole initiation system Correction Answer : Option No. (4) Question Text: The location of primary openings like shafts/ inclines can be best selected in multi-seam development by considering the _________________. Options: (1) Total ton-km effort (2) Centre of the mine field (3) Rise side of the property (4) Dip side of the property (5) None of the Options Correction Answer : Option No. (1) Question Text: The tensile strength of rock is given by__________. Options: (1) σt = P / (πDt) (2) σt = (2P) / (πDt) (3) σt = (2P) / (Dt) (4) σt = (2πP) / (Dt) (5) None of the Options Correction Answer : Option No. (2) Question Text: Which of the following is not a general mode of slope failure? Options: (1) Planar failure (2) Rotational failure (3) Toppling failure (4) Shear failure
(5) None of the Options Correction Answer : Option No. (4) Question Text: Which of the following statements is wrong in the case of blast design for opencast mines? Options: (1) Burden = 25 times hole dia (2) Spacing = 1.2 - 1.5 times Burden (3) Sub grade drilling = 8 times hole dia (4) Bench height = 100 times hole dia (5) Stemming = Burden Correction Answer : Option No. (4) Question Text: Pressure arch theory deals with _________. Options: (1) Distribution of stresses around a mine opening (2) Low thickness zones (3) Arching of supports erected (4) Shear zones (5) None of the Options Correction Answer : Option No. (1) Question Text: Longwall top coal caving is applicable in coal seams of thickness ______. Options: (1) 8 to 12 m (2) 1 to 3 m (3) 2.5 to 4.8 m (4) 3 to 7 m (5) None of the Options Correction Answer : Option No. (1) Question Text: Minimum thickness of parting to be left between two sections of a thick seam is _________. Options: (1) 3 m (2) 5 m (3) 7 m (4) 1 m (5) 5.5 m Correction Answer : Option No. (1) Question Text: Productivity of a highly mechanized coal mine depends on __________. Options:
(5) Love wave Correction Answer : Option No. (4) Question Text: What is the maximum height or width of advanced heading for dewatering of water-logged workings in coal mines? Options: (1) 2.0 m (2) 2.4 m (3) 2.8 m (4) 3.0 m (5) 3.4 m Correction Answer : Option No. (2) Question Text: Every shaft, incline and other outlets provided in an underground coal mine shall be examined, once at least in every _____________, by an ___________ or other competent person and a report of every such examination shall immediately thereafter be recorded in a bound paged book kept for the purpose and shall be signed and dated by the person making the examination. Options: (1) Seven Days; Overman (2) Seven days; Mining Sardar (3) Fifteen Days; Mining Sardar (4) Fifteen Days; Overman (5) Four Weeks; Overman Correction Answer : Option No. (1) Question Text: Maximum number of faces possible in a 5 heading Bord & Pillar District is Options: (1) 10 (2) 11 (3) 12 (4) 13 (5) 14 Correction Answer : Option No. (4) Question Text: Which of the following statement holds good for longwall mining? Options: (1) Maximum tensile stress remains at the edge of the goaf (2) Maximum tensile stress remains at the centre of the goaf (3) Maximum tensile stress shifts from the edge to centre of the goaf (4) Maximum tensile stress shall be away from the chain pillars (5) Maximum tensile stress is on the chain pillars Correction Answer : Option No. (2)
Question Text: Stress is a ______________ quantity. Options: (1) Scalar (2) Vector (3) Tensor (4) Imaginary (5) Exponential Correction Answer : Option No. (3) Question Text: In a subsidence profile, the point at which the curvature changes from positive to negative is known as __________. Options: (1) point of refraction (2) point of relection (3) point of inflexion (4) point of deflection (5) point of caving Correction Answer : Option No. (3) Question Text: For smooth flow, the velocity of sand-water slurry in stowing pipeline should be __________ than the _________ velocity of deposition. Options: (1) more;optimum (2) less;optimum (3) more;critical (4) less;marginal (5) more;marginal Correction Answer : Option No. (3) Question Text: Among Wide & Stall, Knife Edge, Bhaska and Tipong ______________ are underground coal mining methods. Options: (1) only Wide & Stall, Bhaska & Knife Edge (2) only Wide & Stall, Bhaska & Tipong (3) only Wide & Stall, Knife Edge & Tipong (4) only Wide & Stall, Knife Edge & Tipong (5) All the Options Correction Answer : Option No. (5) Question Text: Outcrop of a dome shaped coal seam looks like a__________. Options:
(5) Angle of Draw will be the minimumin strike directions of a seam. Correction Answer : Option No. (1) Question Text: Cavability of a roof bed in a longwall panel is affected by its ______________. Options: (1) strength (2) thickness (3) RQD (4) All the Options (5) span of longwall panel Correction Answer : Option No. (4) Question Text: Factor of safety in slope stability analysis is a ratio between Options: (1) Mobilizing force to Resistive force (2) Resistive force to Mobilising force (3) Mobilising strain to Resistive stress (4) Resistive strain to Mobilising stress (5) Stress X strain Correction Answer : Option No. (2) Question Text: The rock sample having 5.4 cm diameter and 2.7 cm thickness failed at a compressive load of 2403.45 kg while carrying out Brazilian test. Tensile strength of the test rock sample will be ___________. Options: (1) 105 kg/cm^2 (2) 125 kg/cm^2 (3) 202 kg/cm^2 (4) 135 kg/cm^2 (5) 175 kg/cm^2 Correction Answer : Option No. (3) Question Text: The coal bumps in a deep mine may occur when _________________________. Options: (1) The induced stresses are high (2) The rock is fragile (3) Large volume of the rock is exposed to high stress (4) The rock is weak (5) High strain energy concentration in coal pillars Correction Answer : Option No. (5) Question Text:
- The drilling efficiency of DTH blasthole drills is not affected significantly with the increase of
drilling depth. 2. The rotary blast hole drillss are more efficient compared to percussive blasthole drills for all types of rock formation. 3. Rotary blast hole drillss are more efficient compared to percussive blasthole drills for all types of rock formation. 3. Rotary percussive drills are suited for hard and non-abrasive rocks. Options: (1) Only 1 is correct (2) Only 2 is correct (3) Only 1 & 2 are correct (4) Only 2 and 3 are correct. (5) Only 1 and 3 are correct. Correction Answer : Option No. (5) Question Text: In case of full height development of a coal seam, formation of square pillar of 42 m x 42 m (centre to centre) with 3.6 m wide gallery will cause________. Options: (1) 16.4% of coal extraction during pillar formation. (2) 30.5% of coal extraction during pillar formation. (3) 22.6% of coal extraction during pillar formation. (4) 25% of coal extraction during pillar formation. (5) None of the Options Correction Answer : Option No. (1) Question Text: A 10 mm thick sample prepared from a 54 mm dia core was tested for tensile strength (Brazilian). The breaking load was 0.5 tonne. Considering the value of π to be equal to 3.14, the tensile strength of the sample will be nearly equal to_________. Options: (1) 50 kg/cm^2 (2) 60 kg/cm^2 (3) 70 kg/cm^2 (4) 80 kg/cm^2 (5) 90 kg/cm^2 Correction Answer : Option No. (2) Question Text: A surface coal mine is worked by 10 m^3 shovel – 85 tonne dumper combination. If the shovel bucket fill factor is 0.8, the material swell factor is 0.75 and the average in-situ sp.gr. of the material is 3.5 tonne/m^3 , the number of shovel bucket loads required to fill a dumper will be nearly_____ Options: (1) 3 (2) 4 (3) 5 (4) 6 (5) 7
Options: (1) Dominanat Excitation Frequency (2) Velocity of Detonation (3) Air Overpressure (4) Degree of Gassiness (5) Output per Man-Shift Correction Answer : Option No. (1)
