Water Resources Engineering - Online Test

Q1. The flow of water (mass density = 100 kg/m3 and kinematic viscosity = 10-6 m2/s) in a commercial pipe, having equivalent roughness ks as 0.12 mm, yields an average shear stress at the pipe boundary = 600 N/m2. The value of ks/δ' (δ' being the thickness of laminar sub-layer) for this pipe is
Answer : Option D
Explaination / Solution:
No Explaination.


Q2. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
The longitudinal slope of the channel is
Answer : Option A
Explaination / Solution:
No Explaination.


Q3. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
A hump is to be provided on the channel bed. The maximum height of the hump without affecting the upstream flow condition is
Answer : Option B
Explaination / Solution:
No Explaination.


Q4. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
The channel width is to be contracted. The minimum width to which the channel can be contracted without affecting the upstream flow condition is
Answer : Option C
Explaination / Solution:
No Explaination.


Q5. A volume of 3.0×106 m3 of groundwater was pumped form an unconfined aquifer uniformly from an area of 5 km2. The pumping lowered the water table form initial level of 102 m to 99 m. The specific yield of the aquifer is
Answer : Option A
Explaination / Solution:
No Explaination.


Q6. A stable channel is to be designed for a discharged of Q m3 /s with silt factor f as per Lacey’s method. The mean flow velocity (m/s) in the channel is obtained by
Answer : Option A
Explaination / Solution:
No Explaination.


Q7. The base width of an elementary profile of a gravity dam of height H is b. The specific gravity of the material of the dam is G and uplift pressure coefficient is K. The correct relationship for no tension at the heel is given by
Answer : Option A
Explaination / Solution:
No Explaination.


Q8. Water emerges from an ogee spilway with velocity = 13.72 m/s and depth = 0.3 m at it toe. The tail water depth required to form a hydraulic jump at the toe is
Answer : Option C
Explaination / Solution:
No Explaination.


Q9. An outlet irrigates an area of 20 ha. The discharge (L/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring unifromly in 20 days neglecting other field losses is
Answer : Option B
Explaination / Solution:
No Explaination.


Q10. A single pipe of length m1500 and diameter 60 cm connects two reservoirs having a difference of m20 in their water levels. The pipe is to be replaced by two pipes of the same length and equal diameter d to convey %25 more discharge under the same head loss. If the friction factor is assumed to be the same for all the pipes, the value of d is approximately equal to which of the following options?
Answer : Option D
Explaination / Solution:
No Explaination.