Home/Volume-2/Distribution of Air and Its Control-1 Volume-2 Distribution of Air and Its Control-1 Admin03/08/20240 49 Less than a minute Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Distribution of Air and Its Control Distribution of Air and Its Control-1 1 / 29 1. Modern flame safety lamps can withstand an air velocity of? 5 m/s 10 m/s 15 m/s 20 m/s 2 / 29 2. The sensitivity of the vertical U-tube manometer is? 1 pa 5 pa 10 pa 15 pa 3 / 29 3. The maximum air velocity at the main haulage roads is? 1.7 m/s 3 m/s 5 m/s 7.5 m/s 4 / 29 4. If the quantity of air passing through an airway has to be increased from 1200 cu.m/min to 2400 cu.m/min, the effect on HP of fan is? 8 times 4 times 2 times 1/2 times 5 / 29 5. For breaking up the methane layer formed in the roof, the minimum layering number required is? 4 3 2 1 6 / 29 6. The sensitivity of Inclined gauge manometer is? 0.2 pa 0.4 pa 1 pa 2 pa 7 / 29 7. The minimum thickness of the ventilation stopping is? 25 cm 30 cm 38 cm 45 cm 8 / 29 8. In a mine of medium resistance, both series and parallel arrangement of fans give the same result that the increase in the air quantity is? 20% 30% 40% 50% 9 / 29 9. When the wet bulb temperature exceeds 33.5 deg then the rise in the body temperature is? 3 deg 2 deg 1 deg 0.5 deg 10 / 29 10. The ratio between H.P of ventilation and H.P input to engine is called? Mechanical efficiency Manometric efficiency Overall efficiency Fan efficiency 11 / 29 11. In a mine of high resistance, the series arrangement of fans gives a considerable increase in the quantity of air flowing by? 10% 20% 30% 40% 12 / 29 12. The rise in the pressure due to auto compression is .....per 100 m? 1.1 kpa 2 kpa 2.9 kpa 3.5 kpa 13 / 29 13. Heat stroke is caused when the wet bulb temperature is? 294 K 300 K 312 K 320 K 14 / 29 14. The maximum air velocity at the face is? 1.7 m/s 3 m/s 5 m/s 7.5 m/s 15 / 29 15. Man dies when the body temperature rises maximum up to? 38 deg 41 deg 43 deg 48 deg 16 / 29 16. For hard workers the dry kata is? 8 18 10 30 17 / 29 17. While testing with safety lamp for CH4 if the minimum length of the blue flame is 11.5 mm then the % of methane is? 1.5 2 2.5 3 18 / 29 18. The ratio between H.P of ventilation and H.P of Fan shaft is called ? Mechanical efficiency Manometric efficiency Overall efficiency Fan efficiency 19 / 29 19. The angle of the evasee is? 4 deg 6 deg 8 deg 10 deg 20 / 29 20. If the velocity of the air is doubled then the water gauge increased will be? 2 times 4 times 8 times 1/2 times 21 / 29 21. Natural ventilation pressure assists the fan ventilation pressure in case of? Ascential ventilation Descential ventilation Homotropal Antitropal 22 / 29 22. In a mine of low resistance, the parallel arrangement of the fans gives the increase in the air quantity by? 20% 30% 40% 50% 23 / 29 23. At 300 K the working efficiency of a worker is? 100% 80% 60% 50% 24 / 29 24. The efficiency of the workman if the wet bulb temperature in the mine is 310 K? 100 75 50 25 25 / 29 25. The rise in the dry bulb temperature of air due to auto compression is.....per 100 m depth? 2 K 1.96 K 1.012 K 0.976 K 26 / 29 26. The ventilation system which takes intake ventilating air to the lowest point of the district or face and allow it to travel to higher levels to ventilate the district before it goes to the return? Ascential ventilation Descential ventilation Homotropal Antitropal 27 / 29 27. The area of the regulator required for flow of a certain quantity of air can be calculated from the formula? PQ / 75 KSQ2/A3 0.385Q/sqrt(P) none 28 / 29 28. Air velocities in diesel locomotive sheds should not be less than? 4 m/s 2 m/s 1 m/s 0.75 m/s 29 / 29 29. In a mine of high resistance, the parallel arrangement of fans gives a considerable increase in the quantity of air flowing by? 10% 20% 30% negligible Your score is The average score is 52% LinkedIn Facebook Twitter 0% Admin03/08/20240 49 Less than a minute