HHM - Question Bank

HHM - Question Bank

**Unit 1:**

1.
Give complete classification of the different
types of open channel flow

2.
Write
the conditions for most economical channel sections

i)
Rectangular Channel ii) Trapezoidal Channel
iii) Circular Channel

3. Determine the dimensions of an economical Trapezoidal section of an open
channel with sides slope 2H:1V laid at a slope of 1 in 1600 to carry a
discharge of 36 cumecs. Take Chezy’s C = 50.

4. The cross-section of an open channel consists of semi-circular bottom
1.20 m in diameter and with vertical sides. If the depth of water is 1.20 m and
the bed slope is 1 in 2500, calculate the discharge. Take Chezy’s C as 65.

**Unit 2:**

1. Explain rapidly varied flow and gradually varied flow with neat sketch

2. The discharge of water through a rectangular channel of width 6 m is 18 m

^{3}/s when depth of flow of water is 2 m. Calculate: specific energy of the flowing water, critical depth and critical velocity and value of minimum specific energy.
3. Water at a velocity of 8 m/s and at a depth of 1 m is flowing through a
rectangular channel 8 m wide. Determine whether a hydraulic jump will occur,
and if so, calculate the depth of water after the jump and power lost.

4. A rectangular channel 7.5m wide carries 12 cumecs of water with a
velocity of 1.5 m/sec. Compute the specific energy. Also find the depth of flow
in the channel when the specific energy would be minimum. What will be the
value of critical velocity as well as minimum specific energy?

**Unit 3:**

1. Explain the terms geometrical, kinematic and dynamic similarities

2. In a 1 in 20 model of a stilling basin, the height of the hydraulic jump
in the model is observed to be 0.20 m. What is the height of the hydraulic jump
in the prototype? If the energy dissipated in the model is 100 H.P., what is
the corresponding value in prototype?

3. Explain methods of Dimensional Analysis?

4.
What do you mean by dimensionally homogeneous equation?

**Unit 4:**

1. Find the expression for the force exerted by the jet on a flat vertical
plate moving in the direction of the jet.

2. A jet of water 75mm diameter strikes a curved plate at its center with a
velocity of 20m/sec. The curved plate is moving with a velocity of 8m/sec in the
direction of the jet. The jet is deflected through an angle of 165

^{0}. Assuming the plate to be smooth. Find
i) Force exerted on the plate in the
direction of jet ii) Power of the jet and iii) Efficiency of the jet.

3. A jet of diameter 150mm strikes a flat plate normally with a velocity of
20m/sec. The plate is moving with a velocity of 5m/sec in the direction of the
jet and away from the jet. Find

i) The force exerted by the jet on the plate ii) Work done by the jet on the
plate per second.

4. A jet of water of diameter 50mm moving with a velocity of 40m/sec,
strikes a curved fixed symmetrical plate at the center. Find the force exerted
by the jet of water in the direction of the jet, if the jet is deflected
through an angle of 120

^{0}at the outlet of the curved plate.
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