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A ir enters a bord and pillar panel at 10 ppm CO and 20.78% O2. The air at the panel return has 80 ppm CO and 20.52% O2. The ‘Graham’s ratio’ for the status of fire in the panel in % is __________________.1 AnswerI n 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 ___________________1 AnswerWhat is control panel in web programming?1 AnswerF ollowing information about a longwall retreating panel is given. Panel length = 1800 m Face length = 150 m Depth of web = 0.6 m Shearer travels at a speed of 1.5 m/min along the face. Each cutting cycle requires a non-operational time of 2 h 20 min. The panel is fully extractable. The number of working days required to extract the panel is ______________.1 AnswerIn a bord and pillar panel, 6 square pillars are developed as shown in the figure below. The depth of the seam is 300 m and the average unit weight of overburden rock is 25 kN/m3 . If the pillar strength is 15 MPa, the safety factor of the shaded pillar zone (round off to two decimal places) is _________.0 AnswerSolar panels are proposed to be installed on a building roof top to generate electricity. The size of each solar panel is 2 m2 . The efficiency of each panel is 75%. The orientations of the solar panel and related solar data are given in the table below.0 AnswerA 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 is1 AnswerThe bar graph in Panel (a) shows the proportion of male and female illiterates in 2001 and 2011. The proportions of males and females in 2001 and 2011 are given in Panel (b) and (c), respectively. The total population did not change during this period. The percentage increase in the total number of literates from 2001 to 2011 is ____.0 AnswerA coal seam lying at a depth of 200 m is developed by bord and pillar method. Pillars are 30 m centre to centre with a gallery width of 4 m. Unit weight of the overlying strata is 28 kN/m3. If the pillar strength is 9.32 MPa, the factor of safety of pillar is ____________.1 Answercommon types of interview 1 AnswerE xposure of weak roof in junctions of a development district in a coal mine can be decreased by5 Answer“Momentum for Change: Climate Neutral Now” is an initiative launched by1 AnswerA flat longwall panel is mined out at an area having subsidence factor a. The measured maximum subsidence on the surface is S for a mining height of m. The subsidence is subcritical if0 AnswerI n underground face blasting, the pull is found to be 10% less than the drillhole length. The headings of 3.6 m width are supported by prop density of 1.44/m2. The hole length is 1.5 m, and 6 rounds of blasting are done in the panel per shift. The number of props to be erected in a shift is ____________________.1 AnswerThe Union Ministry of Environment and Forest recently approved in principle a proposal for Western Ghats Development prepared by K. Kasturirangan-led panel.0 AnswerA (150 mm × 150 mm) square pillar is located in a river with water flowing at a velocity of 2 m/s, as shown in figure. The height of the pillar in water is 8 m. Take density of water as 1000 kg/m3 and kinematic viscosity as 1×106 m/s2. The coefficient of drag of the pillar is 2.0. The drag force exerted by water on the pillar in N is _______.0 AnswerA double ended ranging drum shearer operates in a longwall retreating panel. The following data are provided:0 Answerwrite a speech in 150 200 words on the importance of community service and role of students in organising it. You are Shaurya/Shirin. (ENGLISH-CBSE-12-2018) 1 AnswerWhich of the following return statements in the function has error?1 AnswerWhat does the inscription on Ashoka pillar at Allahabad all about?CBSE- SOCIAL SCIENCE- CLASS- 6- HISTORY(NEW EMPIRES AND KINGDOMS, Chapter-11)20101 Answer