GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Envlmnt No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
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Subject Code:3151913 Date:22/01/2021
Subject Name: Fluid Hydraulics And Pneumatics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
|---|---|
| Q.1 (a) What are limit switches? How do they differ from push button switches? | 03 |
| (b) Which are the different function of hydraulic oil? Also list properties of hydraulic oil. | 04 |
(c) Give ISO/ANSI symbol of following.
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| Q.2 (a) Explain any one-method of controlling air receiver pressure. | 03 |
| (b) Classify air compressors. Write a short note on selection criteria of compressor. | 04 |
| (c) Cite the classification of check valves and explain the function of pilot-operated check valve, giving the necessary drawing. | 07 |
| Q.3 (a) Write a short note on fire resistant oil | 03 |
| (b) Explain 4/3 sliding spool direction control valve working. | 04 |
| (c) List different pressure control valves giving its application. Explain construction and working of any one in detail with the help of neat sketch. | 07 |
| Q.4 (a) Explain ‘cushioning’ of pneumatic cylinder | 03 |
| (b) Write a short note on the Quick Exhaust valve | 04 |
| (c) Explain regenerative circuit with a suitable example. | 07 |
| Q.5 (a) Draw a simple pneumatic circuit for single acting pneumatic cylinder using push button operated 3/2 DC valve. | 03 |
| (b) How continuous rotary air motors differs from limited rotation air motors? | 04 |
| (c) Explain sequencing of four double acting air cylinders with neat sketch. | 07 |
| Q.6 (a) In what ways, pneumatic circuits differ from the hydraulic circuits? | 03 |
| (b) Explain cascade system for circuit design using assumed sequence. | 04 |
| (c) Explain with suitable circuits how the single acting and double acting hydraulic cylinders are controlled. | 07 |
| Q.7 (a) Draw a circuit for operation of unidirectional motor using 3/2 direction control valve | 03 |
| (b) Compare fixed and flexible automation system with suitable example. | 04 |
| (c) Draw and explain sequencing circuit to operate two double acting cylinder using limit valves. | 07 |
| Q.8 (a) What do you mean by automation? List advantages and disadvantages of automation in fluid power systems. | 03 |
| (b) Give classification of automation in industry. Discuss the role of automation in hydraulic and pneumatic industry | 04 |
| (c) Write short note on programmed automation. | 07 |
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