Engineering Questions with Answers - Multiple Choice Questions

# Fluid Mechanics MCQ’s – Gradually Varied Flow(GVF) – 2

1 - Question

If the value of rate of change of specific energy is 7.79×10-4 m and Sf = 0.00013, calculate the value of bed slope.
a) 1 in 1000
b) 1 in 1100
c) 1 in 1200
d) 1 in 1300

Explanation: dEdx = S0 – Sf; S0 = 1 in 1100.

2 - Question

Calculate the rate of change of depth of a rectangular channel having depth 1m and width 4m. Given: C = 40, S0 = 1/900, Sf = 0.0005
a) 4.94×10-4 m
b) 5.94×10-4 m
c) 6.94×10-4 m
d) 7.94×10-4 m

Explanation: 3 - Question

Calculate the rate of change of depth of a triangular channel if the depth is 4m and the side slope is1H:2V. Given:S0 = 1 in 1500;Sf = 0.00004 and n=0.010.
a) 8.95×10-4m
b) 9.95×10-4m
c) 10.95×10-4m
d) 11.95×10-4 m

Explanation 4 - Question

Calculate the value of Sf for a trapezoidal channel having depth 2m, width 5m and side slope of 1H:1.5V. Given: dy/dx=1.18×10-3,S0 = 1 in 1000, C = 50.
a) 0.00001
b) 0.00002
c) 0.00003
d) 0.00004

Explanation: 5 - Question

Determine the rate of change of depth of a rectangular channel having dimensions 2m×3m and the velocity of flow is 2 m/s.
Given:S0 = 1 in 500 and Sf = 0.0007.
a) 0.63m
b) 1.63m
c) 2.63m
d) 3.63m

Explanation: 6 - Question

Calculate the velocity of flow in a triangular channel having depth 7m and the side slope of the channel is 1H:4V if the bed slope of the channel is 1 in 1200 and the slope of the energy line is 0.00010. Given:( dy)/dx=7.55m.
a) 1 m/s
b) 2 m/s
c) 3 m/s
d) 4 m/s

Explanation: 7 - Question

Calculate the value of bed slope of a trapezoidal channel having depth 2m and width 2.5m with a side slope of1H:3V. Given: dy/dx=1.43×10-3; Sf = 0.00002; V = 1.5 m/s.
a) 1 in 1000
b) 1 in 900
c) 1 in 800
d) 1 in 700

Explanation: 8 - Question

The dimensions of a rectangular channel section is2.5m×1m. Calculate the value of Sf if the bed slope of the channel is 1 in 600. Given: dy/dx=1.52×10-3m.
a) 0.0002
b) 0.0003
c) 0.0004
d) 0.0005

Explanation: 9 - Question

The dimensions of a rectangular channel section is 2.5m×1m. Calculate the rate of change of specific energy if the rate of change of depth is 1.52×10-3m.
a) 1.17×10-3m
b) 2.00×10-3m
c) 2.03×10-3m
d) 2.06×10-3m

Explanation: 10 - Question

Calculate the value of rate of change of specific energy for a triangular channel having depth 3.5m and the side slope is 1H:2V. Given:V = 2.5 m/s, dy/dx=8.6×10-4.
a) 3.47×10-4m
b) 4.47×10-4m
c) 5.47×10-4m
d) 6.47×10-4m 