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DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY,

LONERE

End Semester Examination – May 2019

Course: B. Tech in -Civil Engineering

Subject Name: Hydraulic II

Max Marks: 60

Sem: IV

Subject Code: BTCVC401

Date:- 14/05/19

Duration:- 3 Hr.

Instructions to the Students:

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. Each question carries 12 marks.

. Attempt any five questions of the following.

. Illustrate your answers with neat sketches, diagram etc., wherever necessary.

. If some part or parameter is noticed to be missing, you may appropriately assume it and

should mention it clearly

Marks

Q. 1 Attempt following Questions

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A) Enlist flow measuring devices and explain pitot tube.

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B) Differentiate Between open channel and pipe flow.

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C) Determine the height of rectangular weir of length 6m to be built across a

rectangular channel. The maximum depth of water on the upstream side of the

weir is 1.8 m and discharge is 2000 liters/s. Take C_{d} =0.6 and neglect end

contraction.

Q.2 Attempt following Questions

A) Define Critical depth, critical velocity, and alternate depth.

B) Explain Specific energy and Specific energy curve.

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C) A trapezoidal channel has side slopes of 1 horizontal to 2 vertical and the slope

of the bed is 1 in 1500. The area of the section is 40 m^{2}. Find the dimensions of

the section if it is most economical. Determine the discharge of the most

economical section if C=50

Q. 3 Attempt following Questions

(A) Define and explain

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i) Hydraulic jump in short ii) GVF with assumptions

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B) Give classification of channels according to flow (only table) and derive

expression for the length of back water curve / Direct step method.

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Q.4 Attempt any two of following Questions

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A) Derive the expression for force exerted by stationary curved plate when

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i)jet strikes at centre ii)jet strikes at one end tangentially on symmetrical plate

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B) Explain velocity triangles at outlet and inlet of unsymmetrical moving curved

plate when jet strikes tangentially at one of the tips. Derive the expression for

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) The force exerted by jet of water on same plate

) Work done per second per unit weight of fluid striking per second

) Work done per second per unit mass of fluid striking per second.

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C) A jet of water of diameter 7.5 cm strikes a curved plate at its centre with a

velocity of 20 m/s. The curved plate is moving with a velocity of 8 m/s in the

direction of jet. The jet is deflected through an angle of 165^{0}. Find:

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i) The force on the plate i) Power of the jet iii)The efficiency of the jet.

Q.5 Attempt any two of following Questions

A) Write a note on classification of hydraulic turbines

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B) A pelton wheel has a mean bucket speed of 10 m/s with a jet of water flowing

at the rate of 700 lit/sec under a head of 30m. The bucket deflects the jet through

an angle of 160^{0}, Calculate the power given by water to the runner and the

hydraulic efficiency of the turbine. Assume coefficient of velocity as 0.98.

C) Explain: 1) Classification of pumps 2) Selection of pumps.

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Q.6 Attempt following Questions

(A) Explain – Laminar boundary layer, Turbulent boundary layer, Laminar sub

layer and Separation of boundary layer.

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B) Find The Displacement thickness, Momentum Thickness and energy thickness

for the velocity distribution in boundary layer given by u/U=y/ where u is the

velocity at a distance y from the plate and u = U at y = where = boundary

layer thickness. Also calculate the ratio Displacement thickness to Momentum

Thickness.

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** End of paper ***

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