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A General of an Army wants to create a formation of square from 36562 army men. After arrangement, he found some army men remained unused.Then the number of such army men remained unused was
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 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 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
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
Mine System Engineering mcq question image
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
If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth ? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. 7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. Select the correct answer using the code given below:
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.
An army lost 10% of its men in war. 10% of the remaining died due to disease and 10% of the rest were declared disabled. Thus the strength of the army was reduced to 729000 active men. The original strength of the army was :