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VTU Mechanical Engineering (Semester 7)
Hydraulics & Pneumatics
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) State Pascal's law. Explain with neat sketch, the basic hydraulic power system
6 M
1 (b) Explain the construction and working of Balanced Vane Pump.
8 M
1 (C) A Vane has a rotor of diameter 50 mm, a cam ring of diameter 80 mm and the vane of width 40 mm. Compute the volumetric displacement if the eccentricity is 10 mm.
6 M

2 (a) With sketch briefly explain linear hydraulic actuators
6 M
2 (b) Explain with neat sketch the operation of Swash Plate Piston motor in hydraulic system
5 M
2 (c) A hydraulic motor has a volumetric displacement of 123 cm3 operating at a pressure of 60 bar and speed 1800 RPM. If the actual flow rate consumed by the motor is 0.004 m3/sec and the actual torque delivered by the motor is 100 Nm. Find: i) Volumetric efficiency, ii) Mechanical efficiency, iii) Overall efficiency
9 M

3 (a) Explain with a neat sketch the working of four way, two position directional control valve with symbolic representation
6 M
3 (b) Explain with a neat sketch construction and operation of simple pressure relief valve
7 M
3 (c) Explain briefly with neat sketch working of pressure compensated flow control valve.
7 M

4 (a) Explain with a neat circuit diagram the working of a regenerative circuit
8 M
4 (b) Explain with a neat circuit working of a sequencing circuit in a drilling machine
8 M
4 (c) What are hydraulic accumulators? Classify the accumulators used in hydraulic system.
4 M

5 (a) Explain any five desirable properties of a hydraulic fluid
10 M
5 (b) What are the functions of reservoir system? Explain briefly with neat sketch construction of reservoir system
10 M

6 (a) Explain the characteristics of compressed air
6 M
6 (b) Define pneumatic system. Give the difference between hydraulic and pneumatic system
6 M
6 (c) Explain end position cushioning in pneumatic cylinder with diagram
8 M

7 (a) Explain with a neat sketch control of extension of a double acting cylinder using logic gates.
10 M
7 (b) Explain with a neat sketch construction and operation of a typical quick exhaust valve to increase the actuation speed of a cylinder in a pneumatic system.
10 M

8 (a) Explain with a neat diagram coordinated sequence motion of two cylinders
10 M
8 (b) Write a short note on air dryer and air filter.
10 M

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