Jawaharlal Nehru Technlogical University , Anantapur
B.Tech Regular and Supplementary Examination , April/May 2013
Second Year
Second Semester
Department of Civil Engineering
9A01402 - Hydraulics and Hydraulic Machinery
(Regulation 2009)
Code: 9A01402
B.Tech II Year II Semester (R09) Regular & Supplementary Examinations, April/May 2013
HYDRAULICS & HYDRAULIC MACHINERY
(Civil Engineering)
Time: 3 hours Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
1 (a) State and explain Bazin’s formula for determining the constant C.
(b) For a flow in a rectangular channel of width 5 m and depth of flow 2.3 m, the Darcy-Weisbach
friction factor is estimated to be 0.02. Estimate the values of Chezy’s ‘C’ and Manning’s ‘n’.
2 Write short note on integration method of solving GVF equation.
A rectangular channel carries a discharge of 3 cumecs per m width. If the loss of energy in the hydraulic jump is found to be 3.2 m, determine the conjugate depths before and after the jump.
3 Explain in detail about Rayleigh’s method of dimensional analysis. What are the practical uses?
4 (a) Derive the expression for the force exerted by a jet of water on an inclined fixed plate in the
direction of the jet.
(b) A jet of water of diameter 100 mm moving with a velocity of 30 m/s 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 1200 at the outlet of the curved plate.
5 (a) Assuming the required data, design a pelton wheel to generate a power of 1.5 MW when working under a head of 150 m and a speed of 450 rpm.
(b) A Kaplan turbine develops 2150 KW under a head of 7.5 m with an overall efficiency of 88%. It is fitted with an elbow type draft tube having efficiency of 90%.The inlet of the draft tube is 1.8 m in diameter. Determine how much above or below the tail race level should the draft tube inlet be set so that the vacuum pressure there does not exceed 48 cm of mercury.
6 (a) What do you understand by specific speed of a turbine? What is its use?
(b) Define cavitation. What are the effects of cavitation? Give the necessary precautions against cavitation.
7 (a) What is the principle behind a centrifugal pump and derive an expression for the minimum starting speed of a centrifugal pump.
(b) The internal and external diameters of the impeller of a centrifugal pump are 20 cm and 40 cm
respectively. The pump is running at 1200 rpm. The vane angles of the impeller at inlet and outlet are 200 and 300 respectively. The water enters the impeller radially and velocity of flow is constant. Determine the work done by the impeller per kg. of water.
8 (a) Discuss critically, how you plan a power house.
(b) The designed capacity of a hydropower plant is 1.32 x 10^5 KW. If the power generated in the plant is 9 x 104 KW, find the efficiency of the plant. If the peak discharge is 1.5 times the normal
discharge, determine the plant capacity, plant factor and total energy produced in a year.
B.Tech Regular and Supplementary Examination , April/May 2013
Second Year
Second Semester
Department of Civil Engineering
9A01402 - Hydraulics and Hydraulic Machinery
(Regulation 2009)
Code: 9A01402
B.Tech II Year II Semester (R09) Regular & Supplementary Examinations, April/May 2013
HYDRAULICS & HYDRAULIC MACHINERY
(Civil Engineering)
Time: 3 hours Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
1 (a) State and explain Bazin’s formula for determining the constant C.
(b) For a flow in a rectangular channel of width 5 m and depth of flow 2.3 m, the Darcy-Weisbach
friction factor is estimated to be 0.02. Estimate the values of Chezy’s ‘C’ and Manning’s ‘n’.
2 Write short note on integration method of solving GVF equation.
A rectangular channel carries a discharge of 3 cumecs per m width. If the loss of energy in the hydraulic jump is found to be 3.2 m, determine the conjugate depths before and after the jump.
3 Explain in detail about Rayleigh’s method of dimensional analysis. What are the practical uses?
4 (a) Derive the expression for the force exerted by a jet of water on an inclined fixed plate in the
direction of the jet.
(b) A jet of water of diameter 100 mm moving with a velocity of 30 m/s 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 1200 at the outlet of the curved plate.
5 (a) Assuming the required data, design a pelton wheel to generate a power of 1.5 MW when working under a head of 150 m and a speed of 450 rpm.
(b) A Kaplan turbine develops 2150 KW under a head of 7.5 m with an overall efficiency of 88%. It is fitted with an elbow type draft tube having efficiency of 90%.The inlet of the draft tube is 1.8 m in diameter. Determine how much above or below the tail race level should the draft tube inlet be set so that the vacuum pressure there does not exceed 48 cm of mercury.
6 (a) What do you understand by specific speed of a turbine? What is its use?
(b) Define cavitation. What are the effects of cavitation? Give the necessary precautions against cavitation.
7 (a) What is the principle behind a centrifugal pump and derive an expression for the minimum starting speed of a centrifugal pump.
(b) The internal and external diameters of the impeller of a centrifugal pump are 20 cm and 40 cm
respectively. The pump is running at 1200 rpm. The vane angles of the impeller at inlet and outlet are 200 and 300 respectively. The water enters the impeller radially and velocity of flow is constant. Determine the work done by the impeller per kg. of water.
8 (a) Discuss critically, how you plan a power house.
(b) The designed capacity of a hydropower plant is 1.32 x 10^5 KW. If the power generated in the plant is 9 x 104 KW, find the efficiency of the plant. If the peak discharge is 1.5 times the normal
discharge, determine the plant capacity, plant factor and total energy produced in a year.
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