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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-IV EXAMINATION SUMMER 2017
Subject Code: X41902 Date:29/05/2017
Subject Name: Fluid Power Engineering
Time: 10:30 AM TO 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.
Q.1

Show that in case of jet striking the flat plates mounted on wheel, the efficiency will be maximum when the tangential velocity of wheel is half of the jet.
07

A jet of water coming out of nozzle of 8 cm diameter with a velocity of 50m/s strikes the flat plate. Calculate force on the plate, work done and power developed when plate is stationary plate is moving with a velocity of 12m/s along with jet direction plate is moving with a velocity of 12m/s towards the jet.
07
Q.2

What is the function of draft tube? State the type of draft tube and explain with a neat sketch of any one.
07

Why governing of water turbine is required? Explain governing of any one hydraulic turbine with neat sketch
07
OR

Discuss any Characteristic curves of hydraulic turbine
07
Q.3

State the main components of the Centrifugal pump and explain working with neat sketch.
07

A centrifugal pump runs at 500 rpm and discharges 8 m3/min against head of 10m. It has impeller of 50cm outer diameter and 25cm inner diameter. Vanes are set back at outlet angle of 450. The constant velocity flow is 2 m/s. Calculate: 1.The manometric efficiency 2.Vane angle at inlet.
07
OR
Q.3

Derive Darcy- Weisbach formula for calculating loss of head due to friction in a pipe.
07

An oil of specific gravity 0.78 is flowing through a pipe of diameter 300 mm at the rate of 0.6m3/sec . Find the head loss due to friction and power required to maintain the flow for a length of 500 meter. Take kinematic viscosity of an oil as 0.29 stokes.
07
Q.4

A centrifugal air compressor draws air at a temperature of 25°C running at 15000 rpm has the following data:
1. Outer diameter of blade tip= 500 mm
2. Slip factor=0.85
3. Isentropic total head efficiency= 0.82
Assuming that the absolute velocities of air at inlet and outlet are same. Calculate
1. Temperature rise of air passing through compressor
2. Static pressure ratio
07

Give detail classification of rotary compressor and explain any one with line sketch
07
OR
Q.4

Derive an expression for the optimum value of the intercooler pressure in a two stage reciprocating air compressor for perfect inter cooling condition.
07

Define the following terms in case of centrifugal air compressor.
1. Slip
07
2
2. Slip factor
3. Power in put factor
Derive an equation of Euler's work in case of centrifugal compressor with usual notation.
Q.5

What do you mean by minor energy losses? Derive equation for the loss of head due to sudden enlargement in pipe.
07

Draw and explain Hydro-electric Power Plant with neat Sketch.
07
OR
Q.5

Give classification of Reciprocating pump. Draw neat sketch of single acting reciprocating pump.
07

Write short note on Jet pump.
07