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Time : 2 p.m. to 5 p.m. Vll. — The Haulage on Planes and in Shafts; also the Different Systems of Underground Haulage, with Horse-power to do the Work. 1. What appliances are you acquainted with to prevent overwinding from a shaft ? and state how they are applied. 2. In the event of a winding-rope breaking while hauling up a cage and loaded tubs, what mechanical appliance is necessary to prevent it falling down the shaft ? 3. What precaution would you adopt to stop tubs on an incline in the event of the rope breaking when the loaded tubs are being hauled up? 4. What circumference of plough steel-wire rope would you use—(l) to haul eight loaded tubs up an incline of 1 in 4 at the rate of 500 ft. per minute, the tubs and load being 15cwt. each; (2) the circumference of a similar description of rope to haul up a loaded cage in a shaft 200 ft. in depth at the rate of 400 ft. per minute, the cage and load being 2 tons, so as to allow a factor of safety of 7 in both cases ?
VIII. — Tapping Water in Mines, and the mode of constructing Dams in Underwood Workings to keep Water back. 1. If you were to tap a large quantity of water in a heading, having the floor and roof good' and the coal hard and compact, (1) explain fully how you would dam the water back, and the material you would use, and show by sketch the manner in which you would construct such a dam; (2) if the coal was of a soft character, and either the roof or floor porous, what advantage would it be to construct a dam ? Give your reasons fully. 2. If you were approaching a large body of water by a heading in a coal-seam, what precautions would you take in approaching the water, and also what means would you adopt to secure the heading before tapping the water. 3. In approaching a body of water which stood 100 ft. higher than when you were tapping it, and the drive or heading being 6ft. by Bft., what would be the pressure of the water in pounds on the face of the drive.
Second-class Certificate.—Third Day.—Time : 9 a.m. to 12 noon. IX. — Blasting and the Use of Explosives. 1. What explosive would you use if carburetted hydrogen gas was generated in a mine? Give your reasons fully, and state what means you would adopt to fire shots. 2. What effect (if any) would a blown-out shot that had been tamped with coal-dust (supposing blasting-powder to have been used) produce if there was a large quantity of finely-divided coal-dust floating about in the mine and no carburetted hydrogen gas generated ? 3. At what temperature does dynamite commence to get in a frozen condition ? and if you were using it in that condition, what means would you adopt to effect complete combustion ? Also, state the manner in which you would thaw frozen dynamite. 4. If a shot of dynamite missed fire, what steps would you take ? 5. If you found a large quantity of deleterious fumes produced by incomplete combustion of dynamite, what steps would you take to destroy the evil effects on the workmen if the ventilation was defective ?
X.-r-The Effect that Faults produce in Coal-seams, and how to ascertain the Direction of a Goal-seam when severed by a Fault. 1. What is meant by a " fault " ? Give three diagrams of faults you have met with in working coal-seams. 2. In meeting with a fault, how do you ascertain the direction the coal is likely to be again found ? Explain fully. 3. What is the difference between a roll and a fault, supposing the coal to be severed in both instances ?
Time : 2 p.m. to 5 p.m. XI. — A Knowledge of Arithmetic and the Method of keeping Accounts. 1. If one man is employed at 10s. per day of eight hours to effect repairs to winding machinery, which cost, when complete, is £8 13s. 4d., how long would it take three men to do the same amount of work supposing the amount of work done by each man is equal; and, if each of the three men was only paid Bs. 6d. per day of eight hours, what would be the saving in the cost of repairs? 2. The wages paid to miners are at the rate of Is. 4d. per hour for each man : what would be the amount paid to forty-eight miners for fifty-four hours' work ? 3. If the cost of blasting-powder was 9|d. per pound, how much would 2cwt. cost? 4. If 1 ton of coal was hauled up a shaft 100 yards deep in one minute, but of this period twenty-five seconds was occupied in taking off and putting the skips on to the cage, how many tons of coal would be lifted in eight hours, and at what rate, in feet, would the cage travel during the time of winding ? 5. If you paid an engine-man at the rate of £3 10s. per week of forty-eight hours, how long would he have to work before his wages came to £8 17s. lid.
XII. — A Knowledge of the Provisions of " The Coal-mines Act, 1886," and Amendment Act, 1890.
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