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Coal mining Engineering

What is standing Orders?

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The manager of every mine in which a mechanical ventilator other than an auxiliary fan is installed,shall submit to the Regional Inspector,within 60days of the coming into force of these regulations,or in the case of a new installation within 30days of the installation,Standing orders specifying the action that shall be taken with respect to the withdrawal of persons from the mine or part thereof in the event of a stoppage of the ventilator.                                                                           The Regional Inspector may,by an order in writing,approve of such standing Orders,either in the from submitted to him or with such additions and alterations as he may think fit,and the standing orders so Approved shll be enforced at the mine.A copy of the standing orders shall b...
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What are the Blasting accessories

Various types of devices used for initiating explosive are called BLASTING ACCESSORIES; example:-Saftey fuse,detonating fuse,Nobel,Raydet, detonating relays,coard relays,circut tester,crimper,shot firing cable,exploder.                                              SAFETY FUSE:-  Looks like cord consist of a core of fine grained gunpowder wrapped with layer of a tape and water proof coating.Burning speed of safety fuse is 100to120sec/meter.                                                                    DETONATING FUSE:- Such as cardtex and geocord detonating fuse.The detonating fuse looks like a plastic cord,it's external dia is about5mm.and weight about 20gm.per meter length.Its velocity of detonat...
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WHAT IS O.M.S??

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O.M.S means output tones per man per shift.It is a method of Expressing the productivity of mines of loader.**Condition of longwall method:-Seam thickness-0.6to2.4m.Moderate depth. Inclination-flat to20*Depth-More than500m.InL/W working with coal plough,seam thik ness is 0.6m to 2m. Ploughability of coal seam determine as Per ISI( impact strength in Dex) . Where coal is hard in this case water in fusion of the coal face proceed the ploughing operation.Whater infusion is a process of drilling 1.2m to 1.5m.deep holes spaced 3to 6m interval along the direction 45*to it, pressure forseing water 6to10kg/cm2 through them.#Machinanised used in mechansid L/W face" DEARD,DEARD,SHEARER,AFC,POWERED Support,gate belt conveyor,stage loader,In seam miner,Road header..
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MCQ IN COAL INDIA (PART-2)

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 * Which diagram explains the limit of explosibility of CH4?                                              (1)coward  (2)le chetelier  (3)Graham's  (4)palvalov                                                                                                                                                 * The delay between the ignition and the application of the heat source termed as          (1)lag on ignition  (2) incubation period  (3)saturation per...
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What items are noted in inspection of haulage roadway?

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Inspection of haulage and travelling roadways    All haulage and travelling roadways and roads including roadways leading to all the outlets of the mine which are in use shall be inspected by an overman atleast once in every 7 days.A report of every such examination shall be recorded in a bound paged book kept for the purpose and shall be signed and dated by the person who made the examination.  Items of inspection r haulage roadways  Roof and sides are secure. Roadways is white washed.Junctions and coupling/in coupling points are lighted.Manholes are clear and free from obstruction.No material has been dumped/stacked by the side of track.Water is properly channelised.Signalling wires are properly supported.Track sleepers are properly nailed,track is properly graded and packing is ok.There are no missing roolers,diversion pulleys.Track rollers/pulleys are oiled,and not jammed.Stop blocks,runways switches,tub retailers,buffers and other safety devices are ...
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