Q4.It was decided to construct a fabric filter, using bags of 0.45 m diameter and 7.5 m
long, for removing industrial stack gas containing particulates. The expected rate of
airflow into the filter is 10m3 /s. If the filtering velocity is 2.0 m/min, the minimum
number of bags (rounded to nearest higher integer) required for continuous cleaning
Q7.An isolated 3-h rainfall event on a small catchment produces a hydrograph peak and point of
inflection on the falling limb of the hydrograph at 7 hours and 8.5 hours respectively, after
the start of the rainfall. Assuming, no losses and no base flow contribution, the time of
concentration (in hours) for this catchment is approximately
Answer : Option DExplaination / Solution:
For small catchment, time of concentration is equal to lag time of peak flow.
Q8.The Muskingum model of routing a flood through a stream reach is expressed as
O2 = K0I2 + K1I1 + K2O1, where K0, K1 and K2 are the routing coefficients for the concerned
reach, I1 and I2 are the inflows to reach, and O1 and O2 are the are the outflows from the reach
corresponding to time steps 1 and 2 respectively. The sum of K0, K1 and K2 of the model is
Answer : Option DExplaination / Solution: No Explaination.