31. Advance supporting of 30 m at both the gate roads is required due to
32. A 15 m3 dragline is deployed in an O.B. bench of an O.C. mine. It works for 40 days at the rate of 6 hrs per shift and 3 shifts a day. The cycle time, bucket fill factor, and operating efficiency of the dragline are respectively 50 s, 0.8, and 75%. The total volume of O.B. in m3 handled by the dragline is
33. Mine life time should be calculated based on
34. No mode or type of Capping shall be used which fails to withstand a load of atleast "N" times the maximum static load. N is given by
35. Over 80% of underground coal production in India comes from
36. The following data are provided for a surface mine to be excavated by a shovel:
Production target : 10000 te/shift
Available hours per shift : 6 hrs
Shovel loading cycles per hour : 106
Bank density of the material mined : 2400 kg/m3
Swing factor at 120° swing : 0.91
Bucket fill factor : 0.64
Utilization of available time : 83%
No of working days in a year : 300
No of shifts per day : 3
The annual production target in Mte is
Production target : 10000 te/shift
Available hours per shift : 6 hrs
Shovel loading cycles per hour : 106
Bank density of the material mined : 2400 kg/m3
Swing factor at 120° swing : 0.91
Bucket fill factor : 0.64
Utilization of available time : 83%
No of working days in a year : 300
No of shifts per day : 3
The annual production target in Mte is
37. Select the correct order with respect to the core sizes
38. A non-electric detonating relay does not contain
39. Which of the following sampling technique is followed during sampling from wagons or dumps in the form of scoop taken at regular intervals?
40. Value of Bulking Factor is
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