DOWNLOAD MECHANICAL ENGINEERING PREVIOUS YEARS QUESTION PAPERS PTU B.TECH
FLUID MACHINERY ME 306 B. Tech 6/7th Sem May 2k5
Max Marks 60
Note: Section A is compulsory. Attempt any Four questions from Section B and two from Section C
Note: Section A is compulsory. Attempt any Four questions from Section B and two from Section C
Section A Marks 2 each
1.
Explain the difference between impulse and reaction turbine.
Explain the term dynamic machines.
Classify turbines on the basis of direction of flow.
List different components of a hydraulic power plant.
Explain the significance of specific speed in turbines.
Explain different types of impellers used in centrifugal pumps.
Why backward curved vanes are used on impellers in centrifugal pumps?
Explain the term NPSH.
Explain in brief function of Surge tanks.
Explain working of Hydraulic Accumulator.
1.
Explain the difference between impulse and reaction turbine.
Explain the term dynamic machines.
Classify turbines on the basis of direction of flow.
List different components of a hydraulic power plant.
Explain the significance of specific speed in turbines.
Explain different types of impellers used in centrifugal pumps.
Why backward curved vanes are used on impellers in centrifugal pumps?
Explain the term NPSH.
Explain in brief function of Surge tanks.
Explain working of Hydraulic Accumulator.
Section B Marks 5 each
2. Derive Euler’s equation for energy transfer and explain different terms that constitute it.
3. Explain the function of draft tubes and draw different types of draft tubes.
4. An inward flow pressure turbine has runner vanes which are radial at the inlet and inclined backward at 45o to the tangent at discharge. The guide vanes are inclined at 15o to tangent at inlet and velocity of water leaving the guides is 24 m/sec. Determine correct speed for runner and absolute velocity of water at point of discharge if diameter at entry is twice that at discharge and width at entry is 0.6 times that at discharge.
5. The single acting reciprocating pump with large air vessels on suction and delivery sides close to pump is placed at a height 3.5 m above the water level in the pump. The plunger has 30 cm diameter and stroke of 45 cm. The diameter and length of delivery pipe is 15 cm and 45 m. The pump runs with S.H.M. such that separation takes place at the beginning of suction stroke. Effective height of barometer is 8 m. F=0.1. determine the power saved by air vessels in overcoming friction.
6. Explain working of Gear pump.
Section C Marks 10 each
7. Explain with neat sketch the operation of Kaplan turbine, governing of Kaplan turbines and their performance characteristics.
8. (a) A Pelton wheel is supplied by four pipes in parallel connected to a short common pipe leading to the nozzle. If the losses in short pipe and nozzle are small in comparison with friction losses in four pipes, show that power delivered to the wheel by jet is maximum when
2. Derive Euler’s equation for energy transfer and explain different terms that constitute it.
3. Explain the function of draft tubes and draw different types of draft tubes.
4. An inward flow pressure turbine has runner vanes which are radial at the inlet and inclined backward at 45o to the tangent at discharge. The guide vanes are inclined at 15o to tangent at inlet and velocity of water leaving the guides is 24 m/sec. Determine correct speed for runner and absolute velocity of water at point of discharge if diameter at entry is twice that at discharge and width at entry is 0.6 times that at discharge.
5. The single acting reciprocating pump with large air vessels on suction and delivery sides close to pump is placed at a height 3.5 m above the water level in the pump. The plunger has 30 cm diameter and stroke of 45 cm. The diameter and length of delivery pipe is 15 cm and 45 m. The pump runs with S.H.M. such that separation takes place at the beginning of suction stroke. Effective height of barometer is 8 m. F=0.1. determine the power saved by air vessels in overcoming friction.
6. Explain working of Gear pump.
Section C Marks 10 each
7. Explain with neat sketch the operation of Kaplan turbine, governing of Kaplan turbines and their performance characteristics.
8. (a) A Pelton wheel is supplied by four pipes in parallel connected to a short common pipe leading to the nozzle. If the losses in short pipe and nozzle are small in comparison with friction losses in four pipes, show that power delivered to the wheel by jet is maximum when
In which d is nozzle diameter and l the length of each pipe. F the friction coefficient.
(b) Explain the phenomenon of cavitation in pumps.
(b) Explain the phenomenon of cavitation in pumps.
9. (a) A centrifugal pump has an impeller diameter of 30 cm. The vanes are set at an angle of 20o (backwards) with the tangent to the wheel at outlet. Diameters of suction and delivery pipes are 20 cm and 15 cm respectively. The impeller has discharge area of 0.093 sq. cm. Pressure gauges, at points on the suction and delivery pipes close to pump and each 2 m above the water level in the sump read pressure heads of 4 m below and 28 m above atmospheric pressure respectively when the rate of discharge of water was 0.11 cum/sec. Pump requires 50 kW at 1500 r.p.m. Calculate:
overall efficiency
Manometric efficiency
Loss of head in suction pipe.
(b) Explain the term priming and discuss any priming device with neat sketch.
overall efficiency
Manometric efficiency
Loss of head in suction pipe.
(b) Explain the term priming and discuss any priming device with neat sketch.
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