21. Which includes a wagon, car, truck or any other vehicle moving on rails for conveying material.
22. The height of over burden bench on loose soil shall not exceed . . . . . . . . meters in mechanic opencast.
23. The plan prepared under regulation 65
24. The chairman for bord of mining examinations will be . . . . . . . .
25. When two tubs shall be deemed to be in dose succession, when the distance between them at any time is less than . . . . . . . . meter.
26. Fume or vapour called . . . . . . . .
27. The coupling shall have a factor of safety of not less than . . . . . . . . in relation to maximum static load.
28. The designer should ensure that the machinery, equipment or substances do not entail dangers for the . . . . . . . . of those using them correctly.
29. The mechanical ventilator used below ground for boosting the whole current of air passing along the intake or return air way of a mine or ventilation district called.
30. Every tub while standing on track have a gradient more than . . . . . . . .
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