Download AKTU B-Tech 4th Sem 2015-16 HYDRAULICS HYDRAULIC MACHINES NCE 403 (1) Question Paper

NCE-403

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(Following Paper ID and Roll No. to be filled in your Answer Books)

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Paper ID : 100411 Roll No.

B.TECH.

Theory Examination (Semester-IV) 2015-16

HYDRAULICS & HYDRAULIC MACHINES

Time: 3 Hours Max. Marks: 100

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Section-A

Attempt all parts. All parts carry equal marks.

Q.1. Write answer of each part in short. (2×10=20)

1. Define open channel flow with example.
2. Describe specific energy?

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3. State the relation between Manning's constant and Chezy's constant.
4. Hydraulic jump is sometimes used as energy dissipator at the toe of the spillway of a dam. why?
5. What is meant by Cavitations?
6. Define celerity of the surge.
7. Give the range of specific speed values of Kaplan, Francis turbine and peltonwheels.

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Section-B

Q.2. Attempt any 5 questions from this section. (10×5=50)

1. Classify the following open-channel flow situations:
   1. Uniform Flow in a open channel
   2. Reaction turbine

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2. A spillway discharges a flood flow at a rate of 7.75 m³/s per metre width. At the downstream horizontal apron the depth of flow was found to be 0.50 m. What tail water depth is needed to form a hydraulic jump? If a jump is formed, find its (a) type, (b) length, (c) head loss, (d) energy loss as a percentage of the initial energy, and (e) profile.
3. Derive an expression for the discharge through a channel by Chezy's Formula.
4. The width of a horizontal rectangular channel is reduced from 3.5 m to 2.5 m and the floor is raised by 0.25 m in elevation at a given section. At the upstream section, the depth of flow is 2.0 m and the kinetic energy correction factor a is 1.15. If the drop in the water surface elevation at the contraction is 0.20 m, calculate the discharge if (a) the energy loss is neglected, and (b) the energy loss is one-tenth of the upstream velocity head. [The kinetic energy correction factor at the contracted section may be assumed to be unity].
5. What is critical depth in open-channel flow? For a given average flow velocity, how is it determined?

Section-C

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Note: Attempt any 2 questions from this section. (15x2=30)

Q.3. (a) Draw neat sketches of various shapes of draft tubes. (5)

Q.4. (a) A compound channel is symmetrical in cross section and has the following geometric properties. Main channel: Trapezoidal cross section, Bottom width = 15.0 m. Side slopes = 1.5 H : IV, Bank full depth = 3.0 m, Manning's coefficient = 0.03, Longitudinal slope = 0.0009 Flood plains: Width = 75 m, Side slope - 1.5 H : IV, Manning's coefficient = 0.05, Longitudinal slope = 0.0009. Compute the uniform flow discharge for a flow with total depth of 4.2 m by using DCM with either (i) diagonal interface, or (ii) vertical interface procedures. (12)

(b) A triangular channel with an apex angle of 75° carries a flow of 1.2 m³/s at a depth of 0.80 m. If the bed slope is 0.009, find the roughness coefficient of the channel. (03)

Q.5. A centrifugal pump delivers 0.2 m³/s of water to a height of 25 m through a 150 mm diameter and 75 m long pipe. If the overall efficiency of the pump is 75% and the coefficient of friction, f = 0.01 for the pipe, determine:

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1. Diameter of the impeller (outside diameter)
2. Width of the impeller at outlet. (09)

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