D B4D451 Pages: 3

Reg. No. Name:
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: 3 Hours

PART ^ Answer
any three questions.

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 22m/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 is 10m/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) Overal 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 0.32 and0.9 2 respectively.

The overall efficiency of the turbie 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)

PART ந
Answer any three questions.

5. a. Explain the main operating characteristics of centrifugal pumps. (4)

Page 1 of 3