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GATE 2015 : Mining Engineering

31 pages, 55 questions, 18 questions with responses, 19 total responses,

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GATE 2015 MINING MN Q. 1 Q. 25 carry one mark each. Q.1 Out of the support categories given for an underground coal mine, identify the active support . (A) wire mesh (C) fully grouted roof bolt Q.2 (B) shotcrete (D) hydraulic prop Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition, crushing of the pillars at outbye side is called (A) coal bump (C) stiffening of pillars (B) overriding of pillars (D) spalling of pillars Q.3 A back sight on a bench mark of RL 100.00 m on the floor of a tunnel is 3.25 m. The inverse staff reading on a roof station of the tunnel is 1.25 m. The RL of the roof station in m is ________ Q.4 The angle in degrees at which a ridge line intersects contours is (A) 0 Q.5 (B) 30 (C) 45 (D) 90 In a drum hoisting system through a vertical shaft, overwinding is prevented by (A) Lilly controller (B) detaching hook (C) caliper brake (D) safety catch Q.6 The temperature of a parcel of air decreases from 30.2o C to 28.9o C as it rises from an altitude of 20 m to 120 m. The lapse rate for the atmosphere is (A) subadiabatic Q.7 (B) adiabatic (C) superadiabatic (D) transadiabatic The excess pore pressure in backfill material in a cut-and-fill stope leads to (A) reduction in strength of the wall rock (B) enhancement of bearing strength of fill (C) loss of shear resistance of fill (D) prevention of progressive failure of crown pillar Q.8 The primary purpose of cut holes for blasting in an underground drivage is to (A) (B) (C) (D) Q.9 provide additional free face have smooth surface after blasting prevent over-breakage reduce noise In a triangle ABC, the bearings of the sides AB, BC, and CA are 600 , 1300, and 2700 respectively. The interior angles A, B, and C in degrees respectively are (A) (B) (C) (D) 110, 40, 30 40, 110, 30 30, 40, 110 30,110, 40 Q.10 In a binomial distribution, the probability of success p 0 and number of trials n such that np approaches to a finite value. The variance of the distribution is (A) np MN (B) n (C) p (D) 1/10

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