B.E./B.Tech. Degree Examination, November/December 2013

B.E./B.Tech. Degree Examination, November/December 2013

Fifth Semester - Mechanical Engineering (Regulation 2008/2010)

ME 2305/ME 55/ME 1305/10122/ME 506 - APPLIED HYDRAULICS AND PNEUMATICS 

Time: Three hours

Answer ALL questions.

Maximum: 100 marks

Part A - (10 × 2 = 20 marks)

1. Give the advantages of fluid power system.

Ans. Refer Chapter 1, Q. No. 7, Two Marks Q&A, Page No. 1.23.

2. Draw the symbol of pressure relief valve.

Ans. Refer Chapter 6, Q. No. 23, Two Marks Q&A, Page No. 6.50.

3. What are the main advantages of gear motors?

Ans. Refer Chapter 5, Q. No. 26, Two Marks Q&A, Page No. 5.33. 

4. What is a pressure compensated vane pump and how does it work? 

Ans. Refer Chapter 4, Q. No. 25, Two Marks Q&A, Page No. 4.7. 

5. What is the function of intensifiers?

Ans. Refer Chapter 9, Q. No. 12, Two Marks Q&A, Page No. 9.35.

6. What is meant by sizing of accumulators?

Ans. Refer Chapter 9, Q. No. 10, Two Marks Q&A, Page No. 9.35.

7. What is the advantage of using sequencing circuit?

Ans. Refer Chapter 8, Q. No. 6, Two Marks Q&A, Page No. 8.37.

8. Where speed control circuits are required?

Ans. Refer Chapter 8, Q. No. 10, Two Marks Q&A, Page No. 8.37.

9. What is the advantage of using servo systems?

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

10. List out any two PLC applications in fluid power control.

Ans. Refer Chapter 15, Section 15.8, Two Marks Q&A, Page No. 15.20.

Part B - (5 × 16 = 80 marks)

11. (a) Describe the applications of fluid power system and list the main components required for a power pack with circuit.

Ans. Refer Chapter 1, Sections 1.6 & 16.18.2, Page Nos. 1.7 & 16.33.

[OR]

(b) State and explain the types of fluid power control systems with its advantages.

Ans. Refer Chapter 1, Section 1.7 & 1.8, Page No. 1.10.

12. (a) Draw a neat sketch of variable discharge axial flow piston pump. Also explain its construction and operation with how to calculate minimum and maximum discharge. Give its graphical symbol.

Ans. Refer Chapter 4, Section 4.17.3, Page No. 4.22.

[OR] 

(b) Classify the types of hydraulic cylinders. Describe the working of a double-acting tandem cylinder and gear motor. Give its graphical symbols.

Ans. Refer Chapter 5, Sections 5.1.2, 5.7 & 5.11, Page Nos. 5.1, 5.9 & 5.13.

13. (a) Sketch and explain commonly used 3-position 4-way direction control valves. Also state the applications for closed center, open center, and tandem center valves.

Ans. Refer Chapter 6, Sections 6.10.1 & 6.10.2, Page No. 6.15.

[OR]

 (b) With the help of circuit diagrams, explain the applications of accumulator. Also illustrate its types.

Ans. Refer Chapter 9, Section 9.10, Page No. 9.10.

14. (a) Explain the constructional features of filter, regulator, and lubricator with a sketch.

Ans. Refer Chapter 11, Section 11.10, Page No. 11.15.

[OR]

 (b) Design and draw a sequential circuit for the operation of two cylinders X and Y using cascade method.

Ans. Refer Chapter 13, Section 13.12.1, Page No.13.18.

15. (a) Design an electro pneumatic circuit for the following sequence: A+A- B+B ̄, where + is extension and is retraction.

Ans. Refer Chapter 13, Example 13.7, Page No.13.26.

[OR]

(b) State the applications of fluidic devices. Explain the importance of electrohydraulic servo systems and proportional valves.

Ans. Refer Chapter 15, Sections 15.4, 14.5 & 14.6, Page Nos. 15.4, 14.6 & 14.11.