Water Resources Engineering - Online Test
Q1. An open ended steel barrel of m1 height and m1 diameter is filled with saturated
fine sand having coefficient of permability of 10-2 m/s. The barrel stands on a
saturated bed of gravel. The time required for the water level in the barrel to
drop by 0 7. m5 is
Answer : Option B
Explaination / Solution:
No Explaination.
Q2. For a rectangular channel seetion, Group I lists geometrical elements and Group
II gives proportions for hydraulically efficient section
ye is the flow depth corresponding to hydraulically efficient section. The correct
match of Group I with Group II is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. The Froude number of flow in a rectangular channel is 0.8. If te depth of flow is
1.5 m, the critical depth is
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. A well of diameter 20 cm fully penetrates a confined aquifer. After a long period
of pumping at rate of 2720 litres per minute, the observations of drawdown taken
at m10 and m100 distances from the centre of the well are found to be m3 and
0 5. m respectively. The transmissivity of the aquifer is
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. If the BOD3 of a wastewater sample is 75 mg L/ and reaction rate constant k
(base e) is 0.345 per day, the amount of BOD remaining in the given sample after
10 days is
Answer : Option C
Explaination / Solution:
No Explaination.
Q6. A horizontal flow primary clarifier treats wastewater in which 10%, 60% and
30% of particles have settling velocities of 0.1 mm/s, 0.2 mm/s and 0.1 mm/s
respectively. What would be the total percentage of particles removed if clarifier
operates at a Surface Overflow Rate (SOR) of 43.2 m3 /m2 d?
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. An aerobic reactor receives wastewater at a flow rate of 500 m3d having a COD of
2000 mg/L. The effluent COD is 400 mg/L. Assuming that wastewater contains
80% biodegradable waste, the daily volume of methane produced by the reactor is
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. Direct step method of computation for gradually varied flow is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Water flows through a 100 mm diameter pipe with a velocity of 0.015 m/sec. If
the kinematic viscosity of water is 1.13 × 10-6 m2 sec, the friction factor of the
pipe material is
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. A rectangular open channel of width 4.5 m is carrying a discharge of 100 m3 sec.
The critical depth of the channel is
Answer : Option B
Explaination / Solution:
No Explaination.
