8) What is the range of contingencies in an approximate or preliminary Estimate?

9) Which approval authorises the engineering department to take up the work?

10) Which means the sanction of the detailed estimate by the competent authority of the engineering department?

11) Which estimate is prepared while the expenditure on a work exceeds by more than 10%?

12) Which estimate is prepared while the original sanctional estimate is exceeded by more than 5%?