Q. A panel in coal mine produces 400 tonne per day. The number of persons employed in each of the three shifts is 110, 130 and 120. As per CMR, the minimum quantity of air that needs to be circulated at the last ventilation connection of the panel in m3/min is (A) 780 (B) ...
READ MORE +
Q. A system of two identical components connected in series has reliability of 0.25. The reliability of each component is Ans: 0.5-0.5
READ MORE +
Q. In a bord and pillar development district, 6 headings driven along the strike direction are surrounded by panel barriers on the dip and rise sides. The maximum possible number of faces for the panel is Ans: 16.0-16.0
READ MORE +
Q. For the conveyor belt drive shown, the tension on the tight side (T1 ) is double that of the slack side. The coefficient of friction between belt and drum is 0.21. The minimum angle of lap (in degree) to avoid slippage of the belt is . Ans: ...
READ MORE +
Q. The RL of the initial station is 200 m. If Σ BS = 1.54 m of the last station in m is and Σ FS = 0.45 m , then the RL. Ans: 201.09-201.09 .
READ MORE +
Q. Two contours of RL 60 m and 70 m are separated by 34 m measured along dip of the seam. The dip of the seam in degree is Ans: 16.5-17.5
READ MORE +
Q. The figure depicts a transportation problem along with the solution. The correct statement is A. unbalanced problem, optimal solution B. unbalanced problem, sub-optimal solution C. balanced problem, optimal solution D. balanced problem, sub-optimal solution Ans: Balanced ...
READ MORE +
Q. The property that CANNOT be determined from uniaxial compressive strength test of a rock sample fitted with strain gauges is (A) cohesion (B) Poisson’s ratio (C) modulus of elasticity (D) dilation Sol: ...
READ MORE +
Q. Exposure of weak roof in junctions of a development district in a coal mine can be decreased by(A) increasing dimension of panel barrier(B) stitching side walls(C) increasing support density at junctions(D) staggering the junctions Ans: staggering the junctions
READ MORE +
Q. A vehicle powered by a spark ignition engine follows air standard Otto cycle (g=1.4). The engine generates 70 kW while consuming 10.3 kg/hr of fuel. The calorific value of fuel is 44,000 kJ/kg. The compression ratio is _________ (correct to two decimal places). Ans: 7.40 - 7.80
READ MORE +