B.E./B.Tech. Degree Examination, November/December 2012

B.E./B.Tech. Degree Examination, November/December 2012

Fifth Semester - Mechanical Engineering (Regulation 2008)

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

Time: Three hours 

Maximum: 100 marks

Answer ALL questions.

Part A - (10 × 2 = 20 marks)

1. Under what conditions pneumatic systems are preferred?

Ans. Refer Chapter 10, Q. No. 5, Two Marks Q&A, Page No. 10.12.

2. List the primary functions of hydraulic fluid.

Ans. Refer Chapter 2, Q. No. 1, Two Marks Q&A, Page No. 2.21.

3. What is a balanced vane pump?

Ans. Refer Chapter 4, Q. No. 19, Two Marks Q&A, Page No. 4.46.

4. Name the different types of cylinder mountings.

Ans. Refer Chapter 5, Q. No. 18, Two Marks Q&A, Page No. 5.33.

5. What is the function of unloading valve and sequence valve?

Ans. Refer Chapter 6, Q. Nos. 25 & 27, Two Marks Q&A, Page No. 6.50.

6. What is an intensifier and where is it used?

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

7. What is a power pack?

Ans. Refer Chapter 16, Q. No. 5, Two Marks Q&A, Page No. 16.39.

8. What are the functions of air filter and dryer?

Ans. Refer Chapter 11, Q. Nos. 11 & 18, Two Marks Q&A, Page No. 11.21.

9. Differentiate pressure switch and temperature switch.

Ans. Refer Chapter 14, Q. No. 7, Two Marks Q&A, Page No. 14.16.

10. When to use timer and relay? Why?

Ans. Refer Chapter 14, Q. No. 11, Two Marks Q&A, Page No. 14.17.

PART B - (5 × 16 = 80 marks)

11. (a) (i) Write the advantages and applications of fluid power with respect to machine tool applications.

Ans. Refer Chapter 1, Sections 1.5 and 1.6, Page No.1.5.

(ii) How to select oil for the industrial application?

Ans. Refer Chapter 2, Section 2.8, Page No.2.18.

 [OR]

 (b) (i) Write short notes on: (1) Laminar and turbulent flow; (2) Darcy-Weisbach equation.

Ans. Refer Chapter 3, Sections 3.6 and 3.14, Page Nos.3.9 & 3.14.

 (ii) What is Moody diagram? Explain the important characteristics of it. 

Ans. Refer Chapter 3, Sections 3.14.2, Page No.3.15.

12. (a) (i) Explain the construction and working of a swash plate type piston pump with neat sketch.

Ans. Refer Chapter 4, Section 4.17, Page No.4.22.

(ii) Write a short note on Telescopic cylinder.

Ans. Refer Chapter 5, Section 5.6, Page No.5.8.

[OR]

(b) (i) Explain the working of a gear type motor and vane type motor.

Ans. Refer Chapter 5, Sections 5.11 & 5.12, Page Nos.5.13 & 5.14.

(ii) Explain the cushioning of cylinder.

Ans. Refer Chapter 5, Section 5.5, Page No.5.6.

13. (a) (i) Explain the working of a pilot operated pressure relief valve with neat sketch.

Ans. Refer Chapter 6, Section 6.15, Page No.6.21.

(ii) Explain the use of counter-balance valve with a circuit.

Ans. Refer Chapter 8, Section 8.9, Page No.8.12.

 [OR]

(b) (i) Explain the different types of accumulator with neat sketch.

Ans. Refer Chapter 9, Sections 9.2 – 9.9, Page No.9.2.

(ii) Explain the commonly used electrical control devices in fluid power systems.

Ans. Refer Chapter 14, Section 14.2, Page No.14.1.

14. (a) (i) With a neat sketch explain the working of piston compressor.

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

(ii) Explain meter-in and meter-out circuits with neat sketch.

Ans. Refer Chapter 8 (or 13), Sections 8.14.1 & 8.14.2 (or 13.8.2 & 13.8.3), Page Nos. 8.24 (or 13.12).

[OR]

(b) Design an electro pneumatic circuit using cascade method for the following sequences A+B+ B  ̄A –C+C-.

Ans. Refer Chapter 13, Example 13.1, Page No.13.19.

15. (a) (i) Explain the electro hydraulic servo system with a neat sketch.

Ans. Refer Chapter 6, Section 6.25, Page No.6.32.

(ii) Draw and explain the ladder diagram for electrical control of regenerative circuit.

Ans. Refer Chapter 14, Section 14.8, Page No.14.12.

[OR]

(b)(i) Explain the major components of PLC with a block diagram. 

Ans. Refer Chapter 15, Section 15.9, Page No.15.21.

(ii) Compare the ladder diagram of electrical circuit and PLC circuit. 

Ans. Refer Chapter 14, Section 14.3, Page No.14.6.