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Diploma Engineering - SEMESTER–III • EXAMINATION – SUMMER • 2014
Subject Code: 3331903 Date: 19-06-2014
Subject Name: Fluid Mechanics and Hydraulic Machines
Time: 10:30 am - 01:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. English version is considered to be Authentic.
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Q.1 (a) Define fluid. How fluid are classified? Plot the shear stress-velocity gradient
relationship for various types of fluid. 05
(b) Derive relationship between pressure and pressure head for incompressible fluid. 05
(c) A simple U-tube manometer contains mercury is used to measure the pressure of fluid flowing through pipe line having sp.gravity 0.9.It,s right limb is open to atmosphere and left is connected to pipe ,the center of pipe is 20 cm below the level of mercury in right limb. If the difference in level of mercury in both limb is 40 cm., then find pressure in the pipe in N/m2. 04
Q.2 (a) State the basic principles of fluid flow, and state which equations are derived
from it. 07
(b) State Bernoulli,s equation .Mention the limitations and assumptions of
Bernoulli,s theorem. 07
OR
(b) Oil of Sp. Gravity 0.82 is flowing through a pipe of 30 cm. diameter with a velocity of 4 m/s,dia. of pipe at other end gradually reduced to 25 cm. Find velocity at that end. Also find mass flow
rate of oil. 07
Q.3 (a) Develop Bernoull,s equation by integration. 05
(b) Explain construction and working of Rotameter with figure. 05
(c) Determine the head over sill of a 900 -V - notch when the discharge passing
over it is 100 lit/sec. consider cd = 0.6. 04
OR
Q.3 (a) Write Euler’s eqution of motion along a stream line and explain each terms used in it. 05
(b) Explain the working of flow nozzle with fig. and state the equation for discharge. 05
(c) Head of water of 40 mm. diameter orifice is 12m. If Cd = 0.62 and Cv = 0.98.
Find actual discharge and actual velocity of water. 04
Q.4 (a) Steat the condition underwhich water hammer is produced and explain the
arrangement used to remove the effect of water hammer. List its ill effects. 05
(b) What is meant by specific speed of turbine ? give criteria for selection of turbine. 05
(c) Find head loss due to friction in a pipe 80cm.dia. and 20 km. long. The velocity of water in a
pipe is 4 m/s. take f = 0.005. 04
OR
Q. 4 (a) Explain Reynold’s experiment with neat sketch. State how the Reynold’s
number classify the types of flow? 05
(b) What is the difference between Impulse turbine and reaction turbine. 05
(c) Oil of sp.gravity 0.92 and dynamic viscosity 1 poise is flowing through a 200
mm.dia. pipe it’s discharge is 50 lit/sec. Find the type of flow. 04
Q.5 (a) Draw a neat sketch of reciprocating pump with air vessel and explain the importance
of fitting an air vessel with reciprocating pump. 05
(b) Explain the construction working principle and application of hydraulic ram with neat sketch. 05
( c) State major parts of pneumatic system and also state functions of each part. 04
OR
Q.5 (a) Explain with neat sketch ,the construction and working of external gear pump. 05
(b) Differentiate between hydraulic system and pneumatic system. 05
(c) A centrifugal pump discharges water at the rate of 40 lit/s. against 30m.head. If power required to drive the pump is 22 kw. And friction head loss is 15 m. than find overall efficiency of the pump. 04
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