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Longwall and Other Methods of Working

Longwall and Other Methods of Working

1 / 20

1. With regular fracturing roof the normal range of periodicity of main falls is ?

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2. When the size of the goaf formed exceeds the span of ....times the thickness of the seam the roof tends to break into pieces?

3 / 20

3. The power supports widely used in longwall mining in India are?

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4. In semi unit face the face is divided into 2 units of ....lengths each?

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5. The longwall advancing in UK is called as?

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6. The limiting gradient for longwall method is?

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7. The overall productivity from longwall workings is generally ....times higher compared to bord and pillar working?

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8. The line of extraction in bord and pillar method of depillaring if the seam is gassy thick with strong roof and liable to spontaneous heating?

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9. The C.M. cut coal, load and transfers it on a built in chain conveyor on to a car at the end of each cut and the car?

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10. The roof fall takes place during caving in the span of ?

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11. Which method of longwall is adopted in India?

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12. The length of the longwall face depends on?

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13. In longwall advancing the gate roads extend slightly beyond the face and the extended portion of the gate is called?

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14. The types of coal extraction in longwall face are?

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15. In unit face the face is extracted in one go without any interruption with the face length varies from?

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16. In longwall advancing the line of extraction is always parallel to?

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17. In advanced countries continuous miner is the combination of?

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18. In longwall method of working the percentage of extraction in depillaring and extraction stage is about ?

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19. The longwall retreating method of UK is called as?

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20. In longwall retreating the size of the panel normally does not exceed in area?

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Underground Metal Mining and Methods

Underground Metal Mining and Methods

1 / 43

1. should not exceed is?

2 / 43

2. The method of stoping suitable for thick ore body, strong ore, stable hanging and foot wall, and steeply dipping ore is?

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3. The distance between levels on the plane of the orebody is called?

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4. The method of stoping for massive ore bodies with weak walls and low-grade ore is?

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5. The method of stoping where the orebody is a thick vein type ore, and walls are strong and steeply dipping (i.e., footwall steeper than the angle of repose of the broken ore) is?

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6. Level interval is more in the case of?

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7. The limiting gradient of the slusher haulage is?

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8. The method of stoping for massive ore bodies of high-grade ore with weak walls, and the ore is mined out in a series of horizontal slices from the top of the orebody is?

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9. The roadways driven from the shaft from different horizons for access to the mineral deposit are?

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10. As the haulage road has to be straight and wide with smooth curves it is in the?

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11. Two or three compartment raising is limited to?

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12. The interval between levels depending on several points vary from?

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13. Among the methods of open stoping, the method that lends to large scale mechanisation in drilling, blasting, loading, and transporting is?

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14. The maximum thickness of the ore body that can be worked with the room and pillar method is?

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15. The method of stoping successfully applied to all dips from horizontal to vertical is?

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16. The method of stoping suitable for thin ore bodies, flat dip, and both ore and walls are strong is?

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17. The open raising is limited to?

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18. The thickness of the bed in open stoping is?

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19. Recovery of ore by shrinkage stoping is?

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20. The method of stoping best suited to low grade deposits of horizontal or mild dip and of thickness up to 5m is?

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21. The most common method of raising adopted in majority of metal mines is?

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22. The method of raising suitable for moderate lengths and inclination of 40 to 60 deg with horizontal with strong strata and wall rock is?

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23. Overburden heaps should be at least ....m away from the coal face of a quarry?

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24. Raising by longhole drilling is limited to?

25 / 43

25. The mineral is transported downwards in different sections to the lower level and all the ore is carried to the crusher at the lowest level through?

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26. Breast stoping is employed for stoping ore bodies not more than?

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27. In metal mines a shaft is always sunk in?

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28. The method of stoping applied for massive deposits of large horizontal extent is?

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29. The dilution in sublevel caving is?

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30. Open stope method is used for ore of?

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31. Alamak raise climber can be used only where inclination of the raise from horizontal is?

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32. The pillar left to support the upper level is called?

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33. To maintain suitable working space for workings, the muck pile is shrunk in shrinkage stoping by?

34 / 43

34. In dry powder extinguisher, which chemical is used?

35 / 43

35. The length of the back if the dip of the ore is 30 deg?

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36. The method of stoping suitable for steeply dipping, reasonably firm ore, mixed graded ore with irregular boundaries, and where ground surface is to be protected from subsidence is?

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37. In vertical crater retreat method the spherical charges are used L

38 / 43

38. Extraction of the ore minerals mechanically or hydraulically from floating vessels is known as?

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39. The process which involves reacting the ore with a liquid solvent that will dissolve the mineral at low or moderate temperature and pressure is called?

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40. The method of stoping for narrow and steeply dipping ore with any type of ore and walls is?

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41. In manual method of raise driving the monthly progress is nearly?

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42. The daily progress of raise by Alamak climber is?

43 / 43

43. The method of stoping for high-grade ore with walls of the ore body and back of the stope so weak that they do not stand without support even for a week is?

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Underground Environment and Mine Ventilation

Underground Environment and Mine Ventilation

1 / 36

1. If the wet bulb temperature exceeds 30.5 deg c at any place air current should be faster than?

2 / 36

2. The water gauge developed and quantity circulated with an axial flow fan depend on?

3 / 36

3. In the centrifugal fan smooth flow air and conversion of velocity energy into pressure energy takes place?

4 / 36

4. Cooling power is a combination of temperature of air; relative humidity and ...?

5 / 36

5. The instrument that is used to measure the relative humidity is?

6 / 36

6. With an axial fan, the direction of travel of air current to the mine is changed by?

7 / 36

7. The maximum permissible speed of the axial flow fan is?

8 / 36

8. Whirling hygrometer is rotated with a speed of?

9 / 36

9. The minimum quantity of air per person in deg III mine is?

10 / 36

10. The difference between the atmospheric pressure and the total pressure on the fan drift is called?

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11. Static pressure is measured by?

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12. With a centrifugal fan for a given quantity of air increase of efficiency and reduction in cost of power can be obtained with?

13 / 36

13. The value of the kata factor is?

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14. The manometric efficiency of axial flow fan is?

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15. By varying the pitch of the blades the pressure generated by axial flow fan is?

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16. The inclined water gauge can read upto?

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17. The pitch of the blades of axial flow fans is?

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18. The mostly used blade type in centrifugal fan is?

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19. The maximum water gauge developed in axial flow fan is?

20 / 36

20. Inclined water gauge is used for the measurement of water gauge for?

21 / 36

21. Velocity pressure is measured by?

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22. Upto what depth from the surface the temperature is constant?

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23. Ordinary U-tube manometers are not useful for measurement of gas velocities?

24 / 36

24. The velocity of air flowing in a drift where the velocity pressure is 36 mm is?

25 / 36

25. For comfortable working conditions the reasonable velocity of air at the working face is?

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26. The noxious and inflammable gases of old workings of a coal mine expand when there is?

27 / 36

27. The unit for the kata factor is?

28 / 36

28. The overall efficiency of axial flow fan is?

29 / 36

29. The speed of the centrifugal fan is?

30 / 36

30. The presence of Nitrous fumes are detected by?

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31. In the centrifugal fan reentry of the discharged air is prevented by?

32 / 36

32. The wet bulb temperature in development faces should not exceed?

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33. The water gauge of an axial flow fan can be increased by?

34 / 36

34. For light manual workers the wet kata is?

35 / 36

35. Geothermic gradient in Indian coal seam is....?

36 / 36

36. Cooling power by conduction convection and radiation is given by using the?

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