# 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

• a) 2
• b) 1
• c) 1.5
• d) 1.25

## 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?

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