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Why outlets from a mine are not provided closer than 13.5m?

Why outlets from a mine are not provided closer than 13.5m? Correct Answer Closer outlets will weaken the shaft pillar causing possibility of leakage

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The table given below shows the number of factory outlets opened by a company in different cities. City number of factory outlets C1 40 C2 56 C3 66 C4 72 C5 76 C6 85   The difference between the number of factory outlets in C1 city and C5 city is what percent of the number of factory outlets in C6 city?
A mine ventilation system consists of two splits A and B with resistances of 0.8 Ns2m-8 and 3.2 Ns2m-8, respectively as shown in figure. Trunk airways have resistance of 0.2 Ns2m-8. The main mine fan is generating pressure of 500 Pa.
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The flows in the two splits are equalized by placing a booster fan in split B. Assume that the fan pressure does not change after installation of the booster fan. The size of the booster fan in Pa is
A pumping station in a mine has 4 pumps, P1, P2, P3 and P4 which are connected functionally in parallel configuration as shown in the figure. The individual reliability of the pumps P1, P2, P3 and P4 are 0.80, 0.90, 0.85 and 0.95 respectively. For an effective dewatering operation in the mine denoting system success, at least three pumps should be in operation. The reliability of the system is
Mine System Engineering mcq question image
A mine ventilation system consists of two splits A and B with resistances of 0.8 Ns2m-8 and 3.2 Ns2m-8, respectively as shown in figure. Trunk airways have resistance of 0.2 Ns2m-8. The main mine fan is generating pressure of 500 Pa.
Mine Ventilation mcq question image
The air quantities in m3/s circulated in the splits A and B respectively are
Which of the following statements are true/false?
1. No person shall be allowed to work in a mine on more than six days in any one week.
2. No adult employed above ground in a mine shall be required or allowed to work for more than nine hours in any day.
3. A person will not work for more than five hours continuously before he has had an interval forrest of atleast half an hour.
4. No adult employed below ground in a mine shall be allowed to work for more than eight hours in any day.
Four mines A, B, C and D are located along a road as shown with production in Mt per year 1, 2, 1 and 3 respectively. In order to handle total coal produced. the ideal distance of a coal washery along the road from the mine A in Km is
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The figure shows PV (pressure-volume) diagram of a mine ventilated by both natural means and an exhaust fan. The total ventilation energy is represented by
Mine Ventilation mcq question image
Pressure characteristic of a mine fan is given by. P = -0.06Q2 + 400. where P is the pressure in Pa and Q is the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. An identical fan is installed in the mine to operate in series with the existing fan. The new mine quantity in m3/s is
Mr. Justin wanted to test his students' understanding of the 'nature of weekly markets from a seller's point of view'. Which of the following questions are suited to test this? i. Can a weekly market address all the needs of a family? Why or why not? ii. Compare and contrast the characteristics of a weekly market and a permanent shop. iii. Are you likely to find a well-known brand as part of a weekly market? Why or why not? iv. Can any seller increase their price a lot compared to other sellers in a weekly market? Why or why not?
Which of the following statements are true/false?
1. No person shall be allowed to work in a mine who has already been working in any other mine within the preceding ten hours.
2. The Central government has the power to constitute mining board for any group or class of mines, who enjoy the power equivalent to the certifying inspector.
3. The workers will be granted a certificate of fitness from certifying surgeon and it shall be valid only for a period of twenty four months.
4. Inevery mine where more than five hundred persons are employed, ambulances and stretchers need to be readily available.