# Fluid Mechanics Questions and Answers – Critical Flow in Different Channel Sections – 1

This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Critical Flow in Different Channel Sections – 1”.

1. What is the condition for critical flow?
a) $$\frac{Q}{g} = \frac{A}{T}$$
b) $$\frac{Q^2}{g} = \frac{A^2}{T}$$
c) $$\frac{Q}{g} = \frac{A^3}{T}$$
d) $$\frac{Q^2}{g} = \frac{A^3}{T}$$

Explanation:

2. What is the condition for critical flow in case of maximum discharge?
a) $$\frac{Q}{g} = \frac{A}{T}$$
b) $$\frac{Q^2}{g} = \frac{A^2}{T}$$
c) $$\frac{Q}{g} = \frac{A^3}{T}$$
d) $$\frac{Q^2}{g} = \frac{A^3}{T}$$

Explanation:

3. Determine the velocity in case of critical flow having top width T and area A.
a) V = gD
b) V = $$\sqrt{gD}$$
c) V = gD2
d) V = g $$\frac{D}{2}$$

Explanation:

4. Calculate the specific energy in case of rectangular channel having discharge Q and yc is the critical depth
a) E = $$\frac{y_c}{2}$$
b) E = $$\frac{3}{2}$$ yc
c) E = 2yc
d) E = 3yc

Explanation:

5. Estimate the critical depth in case of a rectangular channel having usual dimensions.
a) yc = $$\sqrt{\frac{q^2}{g}}$$
b) yc = $$\sqrt[3]{\frac{q^2}{g}}$$
c) yc = $$\sqrt{\frac{q}{g}}$$
d) yc = $$\sqrt[3]{\frac{q}{g}}$$

Explanation:
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6. Calculate the critical depth of a rectangular channel having width 3m and the discharge through it is 15 m3/s.
a) 0.36m
b) 1.36m
c) 2.36m
d) 3.36m

Explanation:

7. Calculate the total discharge through a rectangular channel having critical depth of 1.18m and the base width of the channel is 4m.
a) 16 m3/s
b) 20 m3/s
c) 24 m3/s
d) 28 m3/s

Explanation:

8. Calculate the minimum specific energy of a rectangular channel having critical depth of 1.5m.
a) 3.25m
b) 2.25m
c) 1.25m
d) 0.25m

Explanation: Minimum specific energy Ec = 32 yc = 2.25m.

9. The base width of a rectangular channel is 4m and the maximum discharge through the channel is 10 m3/s, calculate the specific energy.
a) 0.7m
b) 1.0m
c) 1.3m
d) 1.6m

Explanation:

10. The minimum specific energy of a rectangular channel is 1.3m and the base width of the channel is 10m, calculate the discharge through the channel.
a) 10 m3/s
b) 15 m3/s
c) 20m3/s
d) 25m3/s

Explanation:

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