31. Equipment used in mining of placer deposits is
32. For the purpose of adequate ventilation, in every ventilating district not less than A cu.m per minute of air per daily tonne output is required to pass along the last ventilation connection. A is given by
33. The range of application of hydraulicking is mostly limited to
34. What should be the minimum pressure to be maintained at the nozzle in hydraulic mining operation?
35. The ratio of current assets to current liability is known as
36. Permissible limit of respirable concentration of coal dust should not be more than
37. The effective position of box cut for a deposit, where ratio of OB : Ore is least should be
38. What should be the minimum insulation resistance of medium power cable?
39. Roof fall accidents can be minimized by
40. Where the telephones or electrical signals are provided, the signal wires shall be supported on insulators and shall not be energized at more than
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