Mine Management, Legislation & General Safety
1. What are different powers conferred on “Inspector of Mines” under Mines Act 1952 in case of (a) immediate and urgent dangers and (b) non compliance with provisions of statute which may lead to dangerous working conditions in course of time? Under what circumstances are such powers required to be exercised?
2. A seam 4 m thick and dipping at 1 in 12 proposed to be worked by longwall caving Describe the preparatory work needed and prepare an application seeking permission under Regulation 100 (A) of Coal Mines Regulations, 1957?
3. For an underground mine working two degree ll gassy seams with two development districts. One conventional depillaring district and one longwall face, prepare an assessment report on effectiveness of ventilation system keeping in view different provisions of statute.
4. A mine with two vertical shaft, equipped with winding installations has been sealed at the surface due to fire. It is proposed to reopen the mine. Enumerate dangers apprehended and precautions to be taken during reopening. Draw up a suitable scheme of reopening.
5. State briefly and comment on the adequacy of statutory provisions of CMR 1957 in respect of any three of the following:
(a) Opencast workings with use of deep hole blasting heavy earth moving machineries,
(b) Fully mechanised high productive Bord and Pillar workings in coal mines.
(c) Factor of safety in winding rope.
(d) Use of belt conveyor in mines.
6. (a) Name the occupational diseases that have been notified under the Mines Act, 1952
(b) What are the statutory provisions on respirable dust in coal mines. How do you conduct dust survey to assess health hazards from respirable dust in mechanised underground mine.
7. State the statutory provisions in respect of any three of the following:
(a) Water danger plan and rescue tracings.
(b) Persons employed in mines. Duties of persons employed in mines.
(c) Duties of Owner and Agent
(d) Supply of protective equipment and obligation of persons provided so perfect equipment.
(e) Emergency plan and sketch of accident site.
8. (a) Define “Intrinsically safe” and “FLP apparatus” and places of their use.
(b) Write briefly the statutory provisions in respect of any two of the following:
(i) Disconnection of supply under I.E.R. 1956.
(ii) Voltage limits in workings below ground,
(iii) Precautions regarding the use of portable electric light in workshop.
Winning & Working
1. Write short notes on:
(c) Multi deck sinking
(d) Temporary support
(e) Cast Iron tubbing
2. Give mechanised pit bottom layout for a ship winding 5 m dia shaft mine. Give machinery, manpower and capacity of the pit bottom system TPD (tonnes per day). Winding capacity is 1500 TPD.
3. Give layout, manpower, machinery required etc for working a 9 m thick seam dipping 1 in 12 to produce 4 million tonnes per year assume your own conditions. What is the total capital investment expected (detailed break up of capital not required).
4. Describe with sketches layout of a continuous miner district in a moderately thick seam dipping at 1 in 20. What daily production is expected during extraction stage ?
5. Describe sand stowing system in a bord and pillar system extracting 300 tpd from one district and with three such districts. What special care is to be taken for functioning of the system efficiently? What tests shall you get conducted before deciding mixing boiler ash with sand or ash alone as stowing material.
6. Write short notes on following:
(i) Delay blasting underground
(ii) SMS blasting
(iii) ANFO blasting
(iv) Dealing misfire in underground
7. Describe typical support system in longwall district. What measure you suggest to ensure of roof in longwall district in a shallow mine. What tests are recommended before deciding support system?
8. An output of 1000-tpd is required from an underground mine with two seams 2.5 m and 4.2 m with parting of 8 m between them. Property is 2 km along strike and 1 Km along dip. Give with sketches a layout of mine and district layout for depillaring stage.
Mine Ventilation, Explosion, Fires & Inundation
1. Write short notes on:
(a) Physiological effects of oxygen deficiency in Air.
(b) Methane layering
(c) Coward’s diagram
(d) Reviving / Resuscitating Apparatus.
2. What precautions shall be taken an early detection of fire in a mine working coal seam liable to spontaneous heating and the measures you would be taking to control the fire after it has been detected.
3. What preventive action you recommend to avoid the mine dust occurring airborne and action you propose to take for the dilution and suppression of air borne dust.
4. A pressure of 490 Pa is observed by 40m3/Sec air passing through a 4 m diameter shaft. Calculate the flow of air in the shaft, if its diameter is enlarged to 6 m by assuming that the pressure drop across the shaft remains unchanged. Also calculate the pressure drop in the enlarged shaft if the flow is maintained at 40m3/Sec
5. Differentiate between:-
(a) Anemometer and Velometer
(b) Crossing point and ignition point temperatures.
(c) Fire damp and Coal dust explosions
(d) Boundary ventilation and Central ventilation system.
6. Discuss the precautions you will be taking while approaching an abandoned water logged old working. Also describe the organization that will be necessary if the inflow of water has been found to increase suddenly.
7. What are major consideration in selecting the size and type of mine fan? How will you control the output of the mine fan?
8. A district was sealed due to occurrence of fire in the coal seam. It is proposed to reopen the district now. How would ascertain that reopening work could be undertaken and the fire in the district has been extinguished? Also describe the procedure to be adopted and the precautions to be taken to opening of the sealed off district.