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1. Measurements of gas concentration at a particular site underground indicate that the concentration of methane in the general body of the air is 0.85%. If 22.5 m3/s of air is flowing at the site determine the volume of methane present in the airstream?
2. A Pitot-static tube is used to measure air velocity as part of a ventilation survey. At a particular measuring site a velocity pressure of 650 Pa is measured, assuming the air has a density of 1.2 kg/m3 what is the air velocity at that point?
3. Describe the method of undertaking an anemometer traverse for a mine airway
4. Describe the two main methods of undertaking a pressure survey in a mine. What advantages and disadvantages do each method have?
5. Describe a method of undertaking a point measurement traverse for airflow in a circular duct using a pitot static tube
6. What methods are available for measuring the area of a mine airway
7. An explosion occurs when a pre-mixed cloud of gas and air (or other oxidiser) combusts resulting in a rapid increase in pressure. Four conditions must exist underground for an explosion to occur. Name the four conditions and give a brief description thereof.
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It is stated that multiprogramming and multiprocessing present the same problems, with respect to concurrency. This is true as far as it goes. However, cite two differences in terms of concurrency between multiprogramming and multiprocessing.
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Des ign Problems, You are required to report on an operating medium to large underground mining operation. Included in your report should be all or most of the items listed below:Production Methods Development Requirements Plans and Sections, Roc..
Analyze heat lost from a 6-inch OD steam line. The line carries high-pressure steam throughout the factory at 400 psi, 400 oF. Specify type and thickness for insulating the steam line.
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CEE 357 Win 2014 HW#2: What will the maximum concentration of pesticide be in the pond, and how long after the spill will that concentration occur?
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Environmental engineering, CEE 357 Win 2014 HW#3, A solution contains 3 x 10 -4 M H 2 CO 3 and 1.5 x 10 -3 M HCO 3 - . How much CO 3 2- is in the solution?
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