Mine Management, Legislation & General Safety
1. What are the objectives of convening the National Safety Conferences? Briefly state major recommendations made by it till date and their impact on legislation and status of safety in mining industry?
2. Inundation continues to be a major hazard in belowground working. As a manager, what action would you take to identify and eliminate this hazard from your mine? Draw an action plan for the same.
3. Define the following in the context of statutory provisions;
(a) Hand-held portable apparatus
(b) Transportable apparatus
(c) Portable apparatus
(e) Flame proof apparatus
(g) Serious bodily injury
(h) General body of air
(i) Ordinarily employed
(j) Person employed in a mine
4. (a) What are the statutory provisions relating to Systematic Supports? Explain the factors that you will take into account while formulating Systematic Support Rules for your mine?
(b) What do you understand by the term “RMR”? What is its application in strata control?
5. What are the statutory provisions relating to “Emergency Plan”? Briefly explain the essential elements of a good Emergency Plan and their rationale. How will you incorporate modern technology advancements into the emergency plan for a large colliery with belowground workings?
6. (a) What are the causes of Pneumoconiosis? What are its symptoms? What precautions should be taken to prevent it?
(b) State statutory provisions relating to periodical medical examinations and discuss its relevance to ILO classification radiographs for detection of Pneumoconiosis.
7. A large opencast mine is approaching a village hutments that cannot be vacated. What actions would you take to fulfill production targets with due regard to safety. Draw a detailed plan of action for the same.
8. (a) In an underground coal mine three persons of shotfiring crew including shotfirer, several hours after returning home, complain of chest pain and breathing difficulty and have to be hospitalized. One of them dies next day. What may be the possible causes of this episode? How would you enquire into it? Discuss possible causes and statutory contraventions.
(b) At the end of a working-shift, the assistant manager is informed that one underground worker is missing. What actions should he take?
Winning & Working
1. Explain with neat sketches the method of ‘extraction of developed pillars by Longwall’. What are the advantages and disadvantages of this method? What is the need for applying this method in Indian coal mines?
2. Write short notes on the following:-
(a) GPS based Truck Dispatch system
(b) Geophysical logging
(c) Monorail Transport
3. There are two contiguous seams, which are already developed and standing on pillars but the workings are not superimposed. How to depillar those seams safely. Give a detailed method of extraction in such situation. Explaining possible dangers and remedial measures to be taken.
4. Mention the suitable conditions required for the deployment of Dragline in opencast mine. Explain the different methods of working by a dragline with neat sketches.
5. What are the different steps to be followed before starting up of a mine from the stage of exploration – Briefly explain about each activity?
6. What are the different physico-mechanical properties of roof rocks and how they are calculated? What is the importance of these properties in Mine Planning?
7. What are the advantages and disadvantages of underground mechanization? What factors are to be considered while planning for mechanization and what are the different modern mechanized methods of extraction – explain their applicability and productivity?
8. What are the different types of explosives used in opencast mine and explain briefly different tests that are conducted on explosives before obtaining permission for use. What are its usefulness in selecting right type of explosive.
Mine Ventilation, Explosion, Fires & Inundation
1. Write notes on:
(a) Telemonitoring system
(b) Equivalent orifice of a Mine.
(c) Pressure Balancing
(d) Use of Nitrogen for control of fire.
2. Differentiate between:
(a) Auxiliary and Booster fans
(b) Long-delay and Multi-delay detonators
(c) Reviving and Resuscitating apparatus.
(d) Crossing point and ignition point temperature.
3. What are the qualitative and quantitative standards of ventilation of a mine as per statute?
In a mine, quantity of air reaching in a district is only about 18%. Draw an action plan for improving the ventilation stating possible reasons and remedial measures.
4. (i) What are the permissible limits of air borne dust, noise and vibration. What are the physiological effects of Noise?
(ii) A drift is ventilated by air flowing through a 60 cm diameter ducting. Find the size of ducting that would be required to double the quantity of flow at the same water gauge.
5. What are the various causes of fire in a mine? Discuss in detail the fire fighting arrangement and organization for a large mine which is worked by SDLs in conjunction with belt conveyor.
6. (i) What is shanky diagram? How does it help in improving the ventilation system of large mine?
(ii) A 500m long airway passes 10m3 of air per second. A new airway of same cross-section and similar surface roughness but 450 m long is added in parallel to it. Assuming the total power to remain constant, calculate the quantity of air passing through the new airway as well as the total quantity.
7. (i) Discuss the following:
(b) Special precautions in Degree III mines during blasting.
(ii) A fan operating at 60mm water gauge and 375 r.p.m. delivers 1500m3/min. At what speed the fan should run to circulate 1800m3/min? Calculate the water gauge and air H.P. at the new speed of the fan.
8. (i) What is Ground Penetration Rader (GPR) technique? What precautions would you take while approaching an abandoned waterlogged workings?
(ii) Discuss the factors that affect the thickness of barrier to be left against waterlogged workings. How would you ensure that the barrier left against old workings is of adequate thickness?