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Printed Pages: 02
Paper Id: 100431
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Sub Code: RCE401
Roll No.
Time: 3 Hours
B.TECH
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(SEM IV) THEORY EXAMINATION 2017-18
HYDRAULICS & HYDRAULIC MACHINES
Note: Attempt all Sections. If require any missing data; then choose suitably.
Total Marks: 70
SECTION A
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- Attempt all questions in brief. 2 x 7 = 14
- Define Different types of flow.
- Determine the maximum discharge through a rectangular open channel of area 8m³ with a bed slope of 1/2000. Assume manning's constant 0.022.
- Define the velocity contour's in open channel flow.
- What is the Back Water Curve?
- Write the types of Surge.
- What assumptions will take in Velocity Triangles?
- Write the main Parts of Kaplan Turbines.
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SECTION B
- Attempt any three of the following: 7 x 3 = 21
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- Uniform flow occurs at a depth of 1.5 m in a long rectangular channel 3 m wide and laid to a slope of 0.0009. If manning's n=0.015. Calculate (a) Maximum height of hump on the floor to produce critical depth (b) The width of contraction which will produce critical depth without increasing the upstream depth of flow.
- In an open channel, the Froude number F remains constant at all depths. if the specific energy E is constant Show that
E = (1+F2)/2 * h - Prove that Hydraulically most efficient trapezoidal section is half of regular Hexagon.
- Integrate the differential equation of G.V.F. for a Horizontal Channel to get the Profile equation as
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x = (hcN-M+1 / S) - (hN-M+1/ S) + constt. - What is NPHS of centrifugal Pump? How it is related to cavitation in Pump?
SECTION C
- Attempt any one part of the following: 7x1=7
- (a) An open channel to be made of concrete is to be designed to carry 1.5m3/s at a slope of 0.00085. Find the most efficient cross section for (a) Rectangular section (b) Trapezoidal section (c) Semicircular section
- (b) Define the following with formula (a) Kinetic Energy Correction factor (b) Momentum correction factor
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- Attempt any one part of the following: 7x1=7
- (a) Using Basic differential equation of G.V.F. show that dh/dx is positive for S1, M3 and S3 Profiles.
- (b) How you will define Transitions between Sub Critical Flow And Super Critical Flow? Also draw the Diagram.
- Attempt any one part of the following: 7x1=7
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- (a) A rectangular channel carrying a super critical stream is to be provided with a hydraulic jump type of energy dissipater. It is desired to have an energy loss of 5 m in hydraulic jump when inlet Froude's number is 8.5. What are the segment depths of this jump?
- (b) Derive the relation between velocity and depths of flow where positive surges moving upward.
- Attempt any one part of the following: 7x1=7
- (a) In order to predict the performance of a large centrifugal pump, a scale model of one sixth size was made with following specifications. Power = 25 KW, Hman =7 mtr, N=1000rpm. If prototype works against 22m. Calculate its working speed, the power required to derive it and the ratio of flow rates handled by to pups.
- (b) Define cavitation. And what Cautions en against Cavitation?
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- Attempt any one part of the following: 7x1=7
- (a) A Pelton wheel is to be designed for the following specification. Shaft power =11722 KW, Head =380 mtr, speed =750rpm, no = 86% Jet diameter (d) not to exceed one-sixth of wheel diameter. Determine (i) The wheel Diameter (ii) Number of jet required (iii) Diameter of jet Take velocity ratio Kv1=0.985 and speed Ratio Kul=0.45
- (b) Define different types of efficiency of Hydraulic turbines.
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