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DIPLOMA ENGINEERING – SEMESTER –III • EXAMINATION – SUMMER 2015
Subject Code: 3331903 Date: 11-05 - 2015
Subject Name: Fluid Mechanics & Hydraulic machines
Time:2:30 pm to 5:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable & Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic
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Q.1 Answer any seven out of ten.14
1. Write fluid characteristics.
2. Show mathematical expression of Newton’s law of viscosity.
3. How capillary action is helpful for trees growing ?
4. State Pascal’s law for static fluid.
5. On what principle of Manometer works?
6. Define fluid kinematics and control volume.
7. Write applications of pump.
8. Sketch circular type orifice.
9. Write the function of guide vane and runner in turbine.
10. What do you mean by single acting and double acting cylinder in hydrulics?
Q.2 (a) Compare between (1) compressible fluid and incompressible fluid (2) liquid
and gas 03
OR
(a) Calculate density and specific gravity for 1 litre oil of 9.60 N weights. 03
(b) Write momentum equation & explain its importance in fluid kinematics. 03
OR
(b) Explain in brief stream line and path line. 03
(c) Derive continuity equation. 04
OR
(c) A simple manometer is used to measure pressure of flowing water. The right limb of manometer is opened to atmosphere and left limb is attached to centre of pipe. The center of pipe is at a level of mercury in right limb. If the difference of mercury height between to limb is 14 Cm. then calculate pressure. 04
(d) Write the causes and preventions measures for water hammer 04
OR
(d) Calculate the diameter of pipe if the water is flowing in pipe with maximum velocity of 5 m/s and 3000 lit/min. rate. 04
Q.3 (a) Classify the flow measuring instruments. 03
OR
(a) Write selection criterion for pipe and pipe size. 03
(b) Calculate the velocity of water through Pitot tube, if coefficient of tube is 0.98. Stagnation and static pressure are 5 m and 4 m respectively. 03
OR
(b) Write the equation for discharge for Orifice meter. How can we measure velocity of fluid with the help of this equation? 03
(c) Write assumption and limitations of Bernoulli’s equation. 04
OR
(c) Calculate the discharge in lit/sec for water flowing through rectangular notch of 50 cm. length. The constant head over notch is 30cm. Take Cd=0.70 04
(d) Calculate total energy head for 30 mm diameter pipe in which water is flowing at a rate of 100 lit/sec. The pipe is 30 m above from the reference level and pressure of water is 500 kPa. 04
OR
(d) Derive the equation for head of inclined venture meter. 04
Q.4 (a) Sketch the volute type centrifugal pump. 03
OR
(a) Explain term (i) Positive displacement pump (ii) Rotadynamic pump 03
(b) Describe construction of Kaplan turbine. 04
OR
(b) Write method for turbine maintenance. 04
(c) Explain the working of reciprocating pump with neat sketch 07
Q.5 (a) Write the advantages and disadvantages of air motor. 04
(b) Explain working of Hydraulic ram with neat sketch. 04
(c) Draw any three symbols used for flow control valve in fluid circuit. 03
(d) Explain application of surface and depth filters used in hydraulic system. 03
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