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# KTU B.Tech S4 Previous Questions Mechanical Engineering

## KTU B.Tech S4 Previous Questions Mechanical Engineering

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FOURTH SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2017

Course Code: ME206

Course Name: FLUID MACHINERY (ME)

Max. Marks: 100 Duration: 3Hours

PART A

1. a. Show that the maximum efficiency of a jet striking normally on a moving flat plate

in the direction of jet is 8/27 (6)

b. The angle of deviation of a jet striking the bucket of a Pelton wheel turbine is usually less than 180°. Why? (4)

2. a. What is a draft tube? Why is it used in reaction turbine? What are the various types

of it? (4)

b. A jet of water moving with a velocity of 22 m/s impinges on a curved vane at one end tangentially. The jet leaves vane at an angle of 120° to the direction of motion of the vane. The velocity of the vane 10 m/s and the angle of the nozzle is 20. Determine

i) vane angle at inlet and outlet.

ii) Work done per kg of water. (6)

3. a.Define the following terms with reference to water turbines. Obtain the relation between them.

i) Hydraulic efficiency ii) Mechanical efficiency iii) Overall efficiency (4)

b) Define Type number in water turbines. What is its significance?. Derive an expression for the same. (6)

4. A Francis turbine develops 160kW at 150rpm under a head of 10m. The peripheral velocity at inlet and flow velocity at inlet of turbine are 0.3√(2gH) and 0.9√(2gH) respectively. The overall efficiency of the turbine is 78% and hydraulic efficiency is 82%. Draw velocity triangle and find i) guide blade angle and runner vane angle at inlet and ii) diameter and width of the runner at inlet. (10)

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