Distribution of Air and Its Control-1

1. The maximum air velocity at the face is?

2. The sensitivity of the vertical U-tube manometer is?

3. The sensitivity of Inclined gauge manometer is?

4. The angle of the evasee is?

5. The ratio between H.P of ventilation and H.P of Fan shaft is called ?

6. While testing with safety lamp for CH4 if the minimum length of the blue flame is 11.5 mm then the % of methane is?

7. For breaking up the methane layer formed in the roof, the minimum layering number required is?

8. The rise in the pressure due to auto compression is .....per 100 m?

9. For hard workers the dry kata is?

10. 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?

11. The rise in the dry bulb temperature of air due to auto compression is.....per 100 m depth?

12. The maximum air velocity at the main haulage roads is?

13. 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?

14. The efficiency of the workman if the wet bulb temperature in the mine is 310 K?

15. In a mine of low resistance, the parallel arrangement of the fans gives the increase in the air quantity by?

16. Modern flame safety lamps can withstand an air velocity of?

17. 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?

18. Heat stroke is caused when the wet bulb temperature is?

19. The minimum thickness of the ventilation stopping is?

20. When the wet bulb temperature exceeds 33.5 deg then the rise in the body temperature is?

21. The ratio between H.P of ventilation and H.P input to engine is called?

22. In a mine of high resistance, the parallel arrangement of fans gives a considerable increase in the quantity of air flowing by?

23. Air velocities in diesel locomotive sheds should not be less than?

24. Natural ventilation pressure assists the fan ventilation pressure in case of?

25. Man dies when the body temperature rises maximum up to?

26. At 300 K the working efficiency of a worker is?

27. In a mine of high resistance, the series arrangement of fans gives a considerable increase in the quantity of air flowing by?

28. If the velocity of the air is doubled then the water gauge increased will be?

29. The area of the regulator required for flow of a certain quantity of air can be calculated from the formula?