B.E./B.Tech. Degree Examination, April/May 2017

B.E./B.Tech. Degree Examination, April/May 2017 

Mechanical Engineering (Regulation 2008/2010)

Time: Three hours

HYDRAULICS AND PNEUMATICS

Answer ALL questions.

Maximum: 100 marks

Part A - (10 × 2 = 20 marks)

1. List the applications of fluid power in agriculture and aviation industries.

Ans. Refer Chapter 1, Q. No. 10, Two Marks Q&A, Page No. 1.24.

2. Write the procedure to calculate the pressure drop in hydraulic circuits. 

Ans. Refer Chapter 3, Q. No. 21, Two Marks Q&A, Page No. 3.31.

3. Why cushioning mechanism is needed for hydraulic cylinders? 

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

4. List the merits and demerits of gear pump.

Ans. Refer Chapter 4, Q. No. 12, Two Marks Q&A, Page No. 4.42. 

5. What is the function of intensifier?

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 function of pressure regulator in a pneumatic system?

Ans. Refer Chapter 12, Q. No. 6, Two Marks Q&A, Page No. 12.16.

8. What is a sequencing circuit?

Ans. Refer Chapter 8, Section 5, Page No. 8.37.

9. List the various methods used for designing logic circuits.

Ans. Refer Chapter 15, Section 15.11, Page No. 15.23.

10. Why interfacing is necessary in a microprocessor control of fluid power?

Ans. Refer Chapter 15, Section 15.8.1, Page No. 15.20.

Part B - (5 × 16 = 80 marks)

11. (a) (i) Explain the various types of fluid power system.

Ans. Refer Chapter 1, Section 1.2.2, Page No. 1.2.

(ii) Write the desirable properties of fluids.

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

(b) Write notes on

[OR]

(i) Sizing of cylinder using Pascal law

Ans. Refer Chapter 3, Section 3.5, Page No. 3.5.

(ii) Frictional losses in laminar and turbulent flow

Ans. Refer Chapter 3, Sections 3.14.1 & 3.14.2, Page No. 3.14,

(iii) Neutralization number.

Ans. Refer Chapter 2, Section 2.4.20, Page No. 2.12..

12. (a) Explain with suitable sketch the working of radial and axial piston pumps.

Ans. Refer Chapter 4, Sections 4.19 & 4.16, Page Nos. 4.26 & 4.21.

[OR]

(b) (i) With neat sketch explain the construction of telescopic cylinder and state its application with example.

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

(ii) What is meant by rodless cylinder? Where it is preferred?

Ans. Refer Chapter 5, Section 5.8.2, Page No. 5.10.

13. (a) Explain the following circuits with neat sketch.

(i) Meter-in

(ii) Meter-out

(iii) Bleed-off

Ans. Refer Chapter 8, Section 8.14, Page No. 8.23.

[OR]

 (b) Write down the various types of accumulator and explain working of accumulator for leakage compensator in hydraulic circuit.

Ans. Refer Chapter 9, Sections 9.1 & 9.10.1, Page Nos. 9.1 & 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 C- A+ B+ B- A− C+ using cascade method.

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

15. (a) (i) Briefly explain the important factors in the maintenance of hydraulic and pneumatic systems.

Ans. Refer Chapter 17, Sections 17.3 & 17.6, Page Nos. 17.3 & 17.15.

(ii) List the various approach for entering the program in the PLC.

Ans. Refer Chapter 15, Section 15.10, Page No. 15.22.

(b) (i) Draw the pneumatic logic cylinder sequencing circuit with neat sketch.

[OR]

Ans. Refer Chapter 15, Section 15.6.2, Page No. 15.16.

(ii) Discuss how Coanda effect used in fluid power system.

Ans. Refer Chapter 15, Section 15.3, Page No. 15.3.