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Posted Date: 08 Feb 2009 Posted By: ram Member Level: Diamond
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2008 Jawaharlal Nehru Technological University Mechanical Engineering Code No: R05 III B.Tech I Semester Regular Examinations, November 2008 HYDRAULIC MACHINERY AND SYSTEMS Question paper
Code No: R05310302 Set No. 4
III B.Tech I Semester Regular Examinations, November 2008
HYDRAULIC MACHINERY AND SYSTEMS
( Common to Mechanical Engineering and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Show that for a curved radial vane, the work done per second is given by
?aV1[Vw1u1 ± Vw2u2]. [16]
2. Write short notes on:
(a) Scroll casing
(b) Turbine efficiencies
(c) oil pressure regulator
(d) Electro hydraulic governor. [16]
3. (a) What are unit quantities. Define the unit quantities for a turbine. Why are
they important?
(b) A water turbine develops 175 hp at 230r.p.m. under a head of 16m. Determine
the scale ratio and the speed of a similar machine which will generate 900 h.p
working under a head of 25 m. [8+8]
4. Derive expressions for the accelerations and friction head impressed on the water in
the suction and delivery pipes. Sketch indicator diagram and determine the work
done per stroke of the pump. [16]
5. (a) Define a centrifugal pump. Explain the working of a single-stage centrifugal
pump with sketches.
(b) The internal and external diameters of the impellers of a centrifugal pumps
are 300 mm and 600 mm respectively. The pump is running at 1000 r.p.m.
The vane angles at inlet and outlet are 20o and 30o respectively. The water
enters the impeller radially and velocity of flow is constant. Determine the
work done by the impeller per unit weight of water. [8+8]
6. (a) How the model testing of the centrifugal pumps are made.
(b) The diameter of an impeller of a centrifugal pump at inlet and outlet are 30
cm and 60 cm respectively. Determine the minimum starting speed of the
pump if it works against a head of 30 m. [8+8]
7. A hydraulic lift is required to lift a load of 12 kN through a height of 10 m, once in
every 1.75 minutes. The speed of the lift is 0.75 m/s. During working stroke of the
lift, water from accumulator and the pump at a pressure of 400 N/ cm2 is supplied
to the lift. If the efficiency of the pump is 80% and that of lift 75%, find the power
required to drive the pump and the minimum capacity of the accumulator. Neglect
friction losses in the pipe.
8. (a) A pipe of diameter 300 mm and length 3500 m is used for the transmission of
power by water. The total head at the inlet of the pipe is 500 m. Find the
maximum power available at the outlet of the pipe, if the value of f=0.006.
(b) A nozzle is fitted at the end of a pipe of length 300 m and of diameter
100 mm. For the maximum transmission of power through the nozzle, find
the diameter of nozzle. Take f = 0.009.
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