VTU Hydraulics & Pneumatics - December 2014 Exam Question Paper

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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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