B.E./B.Tech. Degree Examination, May/June 2013

B.E./B.Tech. Degree Examination, May/June 2013

Fifth Semester - Mechanical Engineering (Regulation 2008/2010)

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. 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. 3.3.

3. Differentiate double-rod and tandem cylinder.

Ans. Refer Chapter 5, Q. No. 15, Two Marks Q&A, Page No. 5.32. 

4. Why do screw pumps generate less noise while running?

Ans. Refer Chapter 4, Q. No. 15, Two Marks Q&A, Page No. 4.46. 

5. Differentiate between fixed and variable displacement pumps. 

Ans. Refer Chapter 4, Q. No. 17, Two Marks Q&A, Page No. 4.46. 

6. List the basic arrangements in hydrostatic drives.

Ans. Refer Chapter 8, Q. No. 17, Two Marks Q&A, Page No. 8.39. 

7. Mention advantages of air motor over electric motor.

Ans. Refer Chapter 12, Q. No. 14, Two Marks Q&A, Page No. 12.7. 

8. What do you mean by logic control?

Ans. Refer Chapter 15, Q. No. 16, Two Marks Q&A, Page No. 15.29.

9. What is a ladder diagram?

Ans. Refer Chapter 14, Q. No. 13, Two Marks Q&A, Page No. 14.17.

10. Define low cost automation.

Ans. Refer Chapter 16, Q. No. 3, Two Marks Q & A, Page No. 16.39.

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 advantages of fluid power systems.

Ans. Refer Chapter 1, Section 1.5, Page No. 1.5. 

[OR]

(b) Write notes on:

(i) Neutralization number

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

(ii) Frictional losses in laminar and turbulent flow.

Ans. Refer Chapter 3, Section 3.14, Page No. 3.14. 

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

Ans. Refer Chapter 4, Section 4.18, Page No. 4.23.

(ii) Write short notes on lobe pump.

Ans. Refer Chapter 4, Section 4.9, Page No. 4.13.

[OR]

 (b) (i) Explain any three types of special cylinders used in hydraulics with neat sketch.

Ans. Refer Chapter 5, Sections 5.6-5.8, Page No. 5.8.

(ii) What is cylinder cushion?

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

13. (a) (i) Explain the construction of pressure relief valve with neat sketch.

Ans. Refer Chapter 6, Section 6.14, Page No. 6.20.

(ii) Design the hydraulic press circuit using unloading valve with sketch.

Ans. Refer Chapter 8, Section 8.8, Page No. 8.11.

[OR]

(b) (i) Explain any two types of accumulator circuits with sketch.

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

 (ii) Design the circuit to speed up the extending speed of a double-acting cylinder with suitable circuit.

Ans. Refer Chapter 8, Section 8.5, Page No. 8.6.

14. (a) (i) Write the procedures for selection of filter, regulator and lubricator.

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

 (ii) Write a short note on mufflers.

Ans. Refer Chapter 11, Section 11.11, Page No. 11.12.

[OR]

(b) Design an electro pneumatic circuit using cascade method for the following sequence: A+B+B ̄A ̄C+C ̄.

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

15. (a) Explain the various types of pneumatic switching elements with simple sketch. 

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

[OR]

 (b) Explain the installation procedures for various hydraulic systems and its maintenance procedures.

Ans. Refer Chapter 17, Sections 17.2 & 17.3, Page No. 17.1..