B.E./B.Tech. Degree Examination, November/December 2006

B.E./B.Tech. Degree Examination, November/December 2006

Fifth Semester - Mechanical Engineering (Regulation 2004)

ME 1305 - APPLIED HYDRAULICS AND PNEUMATICS

Time: Three hours

Answer ALL questions.

Part A (10 x 2 = 20 marks)

Maximum: 100 marks

1. Define fluid power.

Ans. Refer Chapter 1, Q. No. 1, Two Marks Q&A, Page No. 1.22.

2. Explain the term friction factor.

Ans. Refer Chapter 3, Q. No. 14, Two Marks Q&A, Page No. 3.30.

3. What do you mean by non-positive displacement pump? State its implications.

Ans. Refer Chapter 4, Q. No. 4, Two Marks Q&A, Page No. 4.44.

4. What is cylinder cushion? What is its purpose?

Ans. Refer Chapter 5, Q. No. 11, Two Marks Q&A, Page No. 5.31.

5. Differentiate between pressure control valve and pressure relief valve. 

Ans. Refer Chapter 6, Q. No. 19, Two Marks Q&A, Page No. 6.49.

6. Write the functions of a solenoid valve.

Ans. Refer Chapter 14, Q. No. 8, Two Marks Q&A, Page No. 14.16. 

7. What is the need of lubricator unit in the pneumatic system?

Ans. Refer Chapter 11, Q. No. 15, Two Marks Q&A, Page No. 11.22. 

8. Name the various types of filters used in the pneumatic system. 

Ans. Refer Chapter 11, Q. No. 12, Two Marks Q&A, Page No. 11.21. 

9. What is servo valve? How does it work?

Ans. Refer Chapter 6, Q. No. 36, Two Marks Q&A, Page No. 6.52. 

10. Define Coanda effect.

Ans. Refer Chapter 15, Q. No. 5, Two Marks Q&A, Page No. 15.28.

Part B - (5 × 16 = 80 marks)

11. (a) (i) With neat sketch explain the hydraulic and pneumatic fluid power systems. 

Ans. Refer Chapter 1, Sections 1.7 & 1.8, Page Nos. 1.10 & 1.15.

(ii) Discuss the properties of the hydraulic fluids.

Ans. Refer Chapter 2, Section 2.5, Page No.2.12.

[OR]

(b) How to calculate frictional losses in common valves and fittings.

Ans. Refer Chapter 3, Section 3.15, Page No.3.17.

(ii) Define Reynolds number.

Ans. Refer Chapter 3, Section 3.7, Page No.3.10.

(iii) Differentiate between laminar and turbulent fluid flow.

Ans. Refer Chapter 3, Section 3.6, Page No.3.9.

12. (a) (i) Explain the working principle of external gear pump and determine its performance measures.

Ans. Refer Chapter 4, Section 4.7. Page No.4.8.

(ii) Write short notes on variable displacement pumps. 

Ans. Refer Chapter 4, Section 4.5.2, Page No.4.6.

[OR]

(b) Explain the various mechanisms of hydraulic cylinder mountings with neat diagram.

Ans. Refer Chapter 5, Section 5.9, Page No. 5.10.

13. (a) (i) Explain the operational features of the check valve with neat diagram. 

Ans. Refer Chapter 6, Section 6.7, Page No.6.5.

 (ii) Write short notes on shuttle valve.

Ans. Refer Chapter 6, Section 6.11, Page No.6.18.

[OR]

(b) (i) Explain air over oil intensifier system with suitable example.

Ans. Refer Chapter 9, Section 9.13.2, Page No.9.31.

(ii) With neat sketch explain the weight loaded accumulator.

Ans. Refer Chapter 9, Section 9.2, Page No.9.2.

14. (a) What is compressor? Explain the working principle of piston type compressor with neat sketch.

Ans. Refer Chapter 11, Section 11.3, Page No.11.2.

[OR]

(b) What is synchronizing? Explain the synchronizing circuit with suitable approaches.

Ans. Refer Chapter 8, Section 8.12, Page No.8.16.

15. (a) Explain the hydro mechanical servo system with suitable application.

Ans. Refer Chapter 6, Section 6.24, Page No.6.30.

 [OR]

(b) How PLC is used in fluid power control? Explain with a suitable application. 

Ans. Refer Chapter 15, Section 15.8, Page No.15.20.