GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
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Subject Code: 2162004
Subject Name: Hydraulic & Pneumatic Systems
Time: 02:30 PM TO 05:00 PM
Date: 06/12/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | MARKS |
|---|---|
| (a) Write pros and cons of pneumatic system over hydraulic system. | 03 |
| (b) Explain major parts which are essentially needed to design and construct a hydraulic system. | 04 |
| (c) Compare hydraulic system with mechanical, electrical and pneumatic system. | 07 |
| Q.2 (a) Explain different locations of filter in hydraulic circuit. | 03 |
| (b) With neat sketch explain construction and working of push button operated spring return 3/2 DCV. | 04 |
| (c) Explain construction and operation of time delay valve. Explain significance of different components present in a Time delay valve. | 07 |
| OR | |
| (c) Explain construction and working of pressure relief valve with schematic diagram. | 07 |
| Q.3 (a) What is the significance of heating-and cooling devices in hydraulic system? | 03 |
| (b) Enlist different types of accumulators. Explain dead weight and spring loaded accumulators. | 04 |
| (c) With neat sketch explain working and construction of gear pump. What is trapped oil in terms of internal gear pump? | 07 |
| OR | |
| Q.3 (a) Explain any four major functions of hydraulic reservoir. | 03 |
| (b) Write a short notes on fire resistant and bio-degradable oils. | 04 |
| (c) Draw the hydraulic circuit for a vertical cylinder in such a way that the cylinder while extending or retracting does not fall when the power cuts. Show equations of power loss during retraction of the vertical cylinder. | 07 |
| Q.4 (a) Give the detail classification of Actuators. | 03 |
| (b) Draw and explain Meter-in and Meter out circuit. | 04 |
| (c) What is the significance of cushioning system? Explain cushion assembly in detail. | 07 |
| OR | |
| Q.4 (a) What is Hydrostatic transmission? Give its applications. | 03 |
| (b) Draw and explain the regenerative circuit. What are the advantages and disadvantages of it? | 04 |
| (c) What is FRL unit? Explain any two component of FRL unit with schematic diagram. | 07 |
| Q.5 (a) What is the purpose of center condition in 4/3 DCV? Explain any two center condition in detail. | 03 |
| (b) Explain the working of twin pressure valve | 04 |
| (c) Prepare the pneumatic system to perform automatic to and fro motion of double acting pneumatic cylinder and explain working of it. | 07 |
| OR | |
| Q.5 (a) Draw the standard symbols of Counter balance valve, pilot operated check valve and Unloading valve. | 03 |
| (b) Explain construction and operation of quick exhaust valve. Also draw its pneumatic symbols. | 04 |
| (c) Explain construction and working of proportional valve using schematic diagram. | 07 |
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