Shaft Sinking

1. In blasting in shaft sinking the number of holes are....times the dia of the shaft in m?

2. The process of treating holes with chemicals in cementation method is called..?

3. The method of sinking used through any fissured water bearing strata except in running sand is..?

4. The safety device is provided in sinking shaft in case of overwind?

5. The device used to prevent undue swinging of the bucket in sinking shaft?

6. The quantity of ventilating air (cu.m) shall be provided in sinking shaft if depth exceeds 25m?

7. A permanent lining where running sand is encountered during sinking is..?

8. In cementation method the purpose of treating holes with chemicals-silicate of soda and aluminum sulfate is..?

9. In freezing method of shaft sinking which is used for circulation?

10. The starting point of shaft at the ground surface is called..?

11. In freezing method of sinking the removal of ice wall after completion of sinking by sending hot brine through holes is known as..?

12. The method of sinking in unstable or friable strata with heavy inrush of water?

13. The method of sinking through loose deposits of sand up to 20m is?

14. The holes treated with chemicals are called..?

15. The method of sinking through alternate loose and tough strata up to 60m?

16. Upward drivage of shaft is carried out for a distance up to ...m?

17. The method of sinking where there is ground filling problem or considerable inrush of water up to depth of 30m?

18. The method of sinking through loose deposits of sand up to 60m is?

19. Ventilation by mechanical means is provided in sinking shaft exceeding depth of...m?