# Hydraulics Engineering MCQ | Part 1

In a wide rectangular channel if the normal depth is increased by 20 %, then what is the approximate increase in discharge? A. 25% B. 30% C. 35% D. 40

# Hydraulics Engineering Multiple Choice Questions (MCQ) for GATE | Fluid Mechanics | Part 1 | By Akhand Dutta

• A. 25%
• B. 30%
• C. 35%
• D. 40%

35%

• A. Above
• B. Below
• C. Between
• D. Top

Below

• a) 0.4m
• b) 0.6m
• c) 0.7m
• d) 0.8m

0.8 m

## In a rectangular channel, the ratio of specific energy at critical depth EC to critical depth YC is

• a) 2
• b) 1
• c) 1.5
• d) 1.25

Write the correct answer here

## If the value of the 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

1 in 1100

• a) 40
• b) 45
• c) 50
• d) 55

50

## A trapezoidal channel with a base of 6 m and side slope of 2 horizontal to 1vertical conveys water at 17 m3/s with a depth of 1.5 m. is the flow situation is

• a) Subcritical
• b) supercritical
• c) both
• d) None of these

Subcritical

## The flow characteristics of a channel do not change with time at any point. What type of flow is it?

• a) Steady flow
• b) Uniform flow
• c) Laminar flow
• d) Turbulent flow
•

Steady Flow

## Water surface profiles that are asymptotic at one end and terminated at the other end would include

• a) H2 and S2
• b) H3 and S2
• c) M2 and H2
• d) M2 and H3

M2 and H2

• a) 1 m/s
• b) 2 m/s
• c) 3 m/s
• d) 4 m/s

1 m/s

## M3 profile is indicated by which of the following conditions?

• a) Yo > Yc > Y
• b) Y > Yo > YC
• c) Y > YC > Y0
• d) YC > Y0 > Y

Yo > Yc > Y

## Measures velocity at a point of the fluid in a stream is

• a) Venturi meter
• b) pH meter
• c) Pitot-Static tubes
• d) None of the mentioned

Pitot-Static tubes

• a) 1.5
• b) 1.23
• c) 2.35
• d) 1.90

1.23

## A hydraulically efficient trapezoidal section of open channel flow carries water at the optimal depth of 0.6 m. Chezy coefficient is 75 and bed slope is 1 in 250. What is the discharge through the channel

• a) 1.44 m3/ s
• b) 1.62 m3/ s
• c) 15 m3/ s
• d) 2.24 m3/ s

1.62 m3/ s

## The Froude’s number for a flow in a channelsection is 1. What type of flow is it?

• a) Sub Critical
• b) Critical
• c) Super critical
• d) Tranquil

Critical

## In open channels, maximum velocity occurs:

• (a) near the channel bottom
• (b) in the mid-depth of flow
• (c) just below the free surface
• (d) at the surface

just below the free surface

• a) 0.75m
• b) 1.33m
• c) 1.50m
• d) 1.68m

0.75m

## For a channel to be economic which of thefollowing parameters should be minimum

• a) Wetted perimeter
• b) Wetted area
• c) Section factor
• d) Hydraulic depth

Wetted perimeter

## Calculate the discharge through a channel havinga bed slope 1 in 1000, area 12m2, hydraulic radius of 1.2m and Chezy’s constantbeing equal to 50.

• a) 17.98 m3/s
• b) 18.98 m3/s
• c) 19.98 m3/s
• d) 20.98 m3/s

20.98 m3/s

## The term alternate depth in an open channel flow refers to the

• a) Depths having the same specific energy for a given discharge
• b) Depths before and after the passage of the surge
• c) Depths having the same kinetic energy for a given discharge
• d) Depths on either side of hydraulic jump.
•

Depths having the same specific energy for a given discharge

• a) 2.5 m
• b) 5 m
• c) 1.25 m
• d) 2 m

1.25 m

## Which is the cheapest device for measuring flow/ discharge rate.

• a) Venturimeter
• b) Pitot tube
• c) Orificemeter
• d) None of the mentioned

Pitot tube

## For subcritical flow, the Froude number is

• a) Not equal to one
• b) Less than one
• c) Greater than one
• d) Equal to one

Less than one

• a) 0.00001
• b) 0.00002
• c) 0.00003
• d) 0.00004

0.00001

• a) 0.64 m
• b) 0.54 m
• c) 0.44 m
• d) 0.34 m

0.54 m

## A channel bed slope 0.0009 carries a discharge of 30 m3/ when the depth of flow is 1 .0 m What is the discharge carries by an exactly similar channel at the same depth of flow if the slope is decreased to 0.0001?

• a) 10 m3/ s
• b) 90 m3/ s
• c) 15 m3/ s
• d) 60 m3/ s

10 m3/ s

• a) 0.65
• b) 0.72
• c) 0.38
• d) 0.75

0.75

• a) 94.3
• b) 95.6
• c) 97.9
• d) 100

97.9

## The direct step method of computation for GVF is

• a) applicable to non- prismatic channel
• b) applicable to prismatic channel
• c) both
• d) None of these

applicable to non- prismatic channel

## For a hydraulically efficient rectangular section the ratio of width tonormal depth is

• a) 0.5
• b) 1.0
• c) 2.0
• d) 3.5

2.0

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## About the Author

"Meet Mr. Akhand Dutta, the visionary Founder and Owner of CEWA (Civil Engineering With Akhand Dutta). Currently, The Placement Coordinator for Structural Engineering at the prestigious National Institute of Technology, Kurukshetra. With a lif…

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