Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2151903 Fluid Power Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2151903 Date: 31/05/2019
Subject Name: Fluid Power Engineering
Time: 02:30 PM TO 05:00 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 (a) Explain the impulse-momentum principle. 03
(b) State the functions of following components of hydro power plant: Trash rack,
surge tank, dam and power house.
04
(c) How ships are propelled ? Derive an expression for propulsive work and
propulsive efficiency if the water is drawn from an orifice at right angles to the
motion of ship.
07
Q.2 (a) State major applications of hydro power plant. 03
(b) Show that the force exerted by a jet of water on an inclined fixed plate in the
direction of jet is given by Fx = ?aV
2
sin
2
?
Where a = Area of the jet, V = Velocity of the jet and ? = Inclination of the
plate with the jet.
04
(c) A 80 mm diameter jet having a velocity of 25 m/sec strikes a flat plate, the
normal of which is inclined at 45? to the axis of the jet. Find the normal
pressure on the plate
(i) When the plate is stationary
(ii) When the plate is moving with a velocity of 12 m/sec in the direction of
jet and away from the jet.
Also determine the power and efficiency of the jet when the plate is moving.
07
OR
(c) A jet of water strikes at the centre of a single curved vane moving in the
direction of jet with velocity u so that jet velocity relative to vane is (V ? u). If
the outgoing jet makes an angle ? with the entering jet prove that
(i) For maximum efficiency V = 3u and
(ii) Maximum efficiency = ( 1 + cos ?)
07
Q.3 (a) Differentiate between Francis and Kaplan turbine. 03
(b) A Pelton wheel has a mean bucket speed of 10 m/sec with a jet of water flowing
at the rate of 800 litres/sec under a head of 32 metres. The bucket deflects the
jet through an angle of 165?. Calculate the power given by water to the runner
and hydraulic efficiency of the turbine. Assume co-efficient of velocity as 0.98.
04
(c) What is draft tube ? State its functions. With neat diagrams explain salient
features of different types of draft tube.
07
OR
Q.3 (a) Compare inward flow and outward flow reaction turbine. 03
(b) Define the term specific speed and derive an expression for specific speed of
hydraulic turbine.
04
(c) What do you mean by characteristic curves for hydraulic turbines ? Discuss the
main characteristic curves.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2151903 Date: 31/05/2019
Subject Name: Fluid Power Engineering
Time: 02:30 PM TO 05:00 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 (a) Explain the impulse-momentum principle. 03
(b) State the functions of following components of hydro power plant: Trash rack,
surge tank, dam and power house.
04
(c) How ships are propelled ? Derive an expression for propulsive work and
propulsive efficiency if the water is drawn from an orifice at right angles to the
motion of ship.
07
Q.2 (a) State major applications of hydro power plant. 03
(b) Show that the force exerted by a jet of water on an inclined fixed plate in the
direction of jet is given by Fx = ?aV
2
sin
2
?
Where a = Area of the jet, V = Velocity of the jet and ? = Inclination of the
plate with the jet.
04
(c) A 80 mm diameter jet having a velocity of 25 m/sec strikes a flat plate, the
normal of which is inclined at 45? to the axis of the jet. Find the normal
pressure on the plate
(i) When the plate is stationary
(ii) When the plate is moving with a velocity of 12 m/sec in the direction of
jet and away from the jet.
Also determine the power and efficiency of the jet when the plate is moving.
07
OR
(c) A jet of water strikes at the centre of a single curved vane moving in the
direction of jet with velocity u so that jet velocity relative to vane is (V ? u). If
the outgoing jet makes an angle ? with the entering jet prove that
(i) For maximum efficiency V = 3u and
(ii) Maximum efficiency = ( 1 + cos ?)
07
Q.3 (a) Differentiate between Francis and Kaplan turbine. 03
(b) A Pelton wheel has a mean bucket speed of 10 m/sec with a jet of water flowing
at the rate of 800 litres/sec under a head of 32 metres. The bucket deflects the
jet through an angle of 165?. Calculate the power given by water to the runner
and hydraulic efficiency of the turbine. Assume co-efficient of velocity as 0.98.
04
(c) What is draft tube ? State its functions. With neat diagrams explain salient
features of different types of draft tube.
07
OR
Q.3 (a) Compare inward flow and outward flow reaction turbine. 03
(b) Define the term specific speed and derive an expression for specific speed of
hydraulic turbine.
04
(c) What do you mean by characteristic curves for hydraulic turbines ? Discuss the
main characteristic curves.
07
2
Q.4 (a) What do you mean by an air vessel ? Explain the function of an air vessel for
reciprocating pump.
03
(b) Discuss the criteria for selection of pumps. 04
(c)
Show that the pressure rise in impeller of a centrifugal pump is given by
1
2g
[ ]
V
f
1
2
? V
f
2
2
cosec
2
?2 + u
2
2
where ?2 is the blade angle at outlet . Neglect the friction losses.
07
OR
Q.4 (a) Compare screw and scroll compressor. 03
(b) What is pre-whirl ? State its advantages and disadvantages. Draw velocity
diagrams with and without pre-whirl.
04
(c) A single acting two stage air compressor deals with 4.2 m
3
/min of air under
atmospheric conditions of 1 bar and 17?C with a speed of 250 rpm. The
delivery pressure is 80 bar. Assume complete intercooling, find the minimum
power required by the compressor and bore and stroke of the compressor.
Assume a piston speed of 210 m/min, mechanical efficiency of 76 % and
volumetric efficiency of 82 % per stage. Assume polytropic index of
compression in both stages to be n = 1.3 and neglect clearance.
07
Q.5 (a) Explain construction and working of direct acting hydraulic lift. 03
(b) Differentiate between fluid coupling and fluid torque converter. 04
(c) Explain the phenomenon of stalling in axial flow compressor. 07
OR
Q.5 (a) With a neat sketch explain working of centrifugal compressor. 03
(b) Explain construction and working of simple hydraulic accumulator. 04
(c) Explain function, working principle, construction and working of hydraulic
jack.
07
*************
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This post was last modified on 20 February 2020