Gujarat Technological UniversitySummer 2025 examination

GTU 2151903 Fluid Power Engineering Summer 2025 Question Paper & PDF

B.E. · Mechanical Engineering · Semester 5 · Subject code 2151903
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
What is the role of a surge tank in a hydropower plant?
(b)
4 marks

Explain the basic principle of operation of a hydraulic turbine. How does it convert hydraulic energy into mechanical energy?

(c)
7 marks
With neat sketch explain construction and working of hydraulic press.

Q.2

14 Marks
(a)
3 marks

Derive an expression for the force exerted by a jet of water striking on symmetric curved vane at the center.

(b)
4 marks
Explain the principle of jet propulsion in ships.
(c)
7 marks

A jet of water having a velocity of 25 m/sec impinges on a series of vanes moving with a velocity of 15 m/sec. The jet makes an angle of 25° to the direction of motion of vanes when entering and leaves at an angle of 120 °. Calculate:

aThe angles of vanes tips so water enters and leaves without shock
bThe work done per unit weight of water entering the vanes.
cThe efficiency
(c)
7 marks

A jet of water having a velocity of 40 m/s strikes a curved vane, which is moving with a velocity of 20 m/s. The jet makes an angle of 30° with the direction of motion of vane at inlet and leaves at an angle of 90° to the direction of motion of vane at outlet. Draw the velocity triangles at inlet and outlet and determine the vane angles at inlet and outlet so that the water enters and leaves the vane without shock.

Q.3

14 Marks
(a)
3 marks
What is the function of a draft tube in reaction turbines?
(b)
4 marks
Explain the advantages of Kaplan turbine over Francis turbine.
(c)
7 marks
A Pelton Wheel is to be designed for the following specifications:

Power (Shaft/Brake) = 9560 KW Head = 350 m Speed = 750 RPM Overall Efficiency = 85 % Jet diameter not to be exceed 1/6th of the Wheel diameter Determine the following:

1)The Wheel Diameter
2)Diameter of the Jet
3)The number of Jets required. Take Cv = 0.985 and Speed ratio = 0.45.
(a)
3 marks
Name the main components of a Kaplan turbine with neat sketch.
(b)
4 marks
Classify hydraulic turbines with examples based on following criteria:
iEnergy at inlet
iiDirection of flow through runner
iiiHead at the inlet of turbine
ivSpecific speed of turbine
(c)
7 marks

An inward flow reaction turbine has external and internal diameters as 1.1 m and 0.7 m respectively. The hydraulic efficiency of the turbine is 95% when the head on the turbine is 38 m. The velocity of flow at outlet is 2.5 m/sec and discharge at outlet is radial. If the vane angle at outlet is 15° and width of the wheel is 100 mm at inlet and outlet. Determine

1The guide blade angle
2Speed of the turbine
3Vane angle of the runner at inlet
4Volume flow rate of the turbine
5Power developed

Q.4

14 Marks
(a)
3 marks
What is Net Positive Suction Head (NPSH)?
(b)
4 marks

What is the volumetric efficiency of a reciprocating pump? Discuss the factors that affect its efficiency.

(c)
7 marks

A centrifugal pump is to discharge 0.118 m³/s at a speed of 1450 rpm against a head of 25 m. The impeller diameter is 250 mm, its width at outlet is 50 mm and Manometric efficiency is 75 percent. Determine the Vane angle at the outer periphery of the impeller.

(a)
3 marks

What is a reciprocating pump? Define discharge coefficient in the context of reciprocating pumps.

(b)
4 marks
Discus characteristic curves of centrifugal pump.
(c)
7 marks

A single acting reciprocating pump has a plunger diameter of 250 mm and its stroke is 300 mm. The pump runs at a speed of 60 rpm and delivers 14 litres/s of water. Find the theoretical discharge in litres/s, coefficient of discharge and percentage slip.

Q.5

14 Marks
(a)
3 marks
Draw stage velocity diagram of an axial flow compressor.
(b)
4 marks
Classify the Rotary compressor.
(c)
7 marks
Explain the construction and working of a Reciprocating air compressor.
(a)
3 marks
What are the advantages of multistage compression?
(b)
4 marks
Give comparison between axial flow and centrifugal compressor.
(c)
7 marks

Explain phenomenon of surging and choking in centrifugal compressor with neat sketch.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Fluid Power Engineering (Summer 2025, B.E. · Mechanical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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