Solved Questions

SOLVED QUESTIONS

1. Under what conditions of production the numerically controlled machine tools are employed?

[May '10]

Refer chapter 4.1 on Page 4.1.

2. Discuss the characteristics and capabilities of NC machines which makes it more versatile than the conventional machines.

[Apr'19]

Refer chapter 4.2 on Page 4.3.

3. Describe in brief the basic components of a tape operated NC machine tool.

[Nov '18]

Refer chapter 4.2.1 on Page 4.4.

4. Discuss the different data input devices of NC machine tool.

[May '17]

Refer Page 4.7.

5. State a few typical applications where the use of numerical control would be justified.

[Dec '07]

Refer chapter 4.2.5 on Page 4.9.

6. Explain the advantages and limitations of NC machines.

 [Nov '15]

Refer chapter 4.2.6 on Page 4.10.

7. Explain the working of a NC machine tool with the help of a diagram. Also state any two advantages and limitations of NC machines.

[Dec '05, Dec '11 & May'14]

Refer chapter 4.2 on Page 4.3 for working and chapter 4.2.6 on Page 4.10 for advantages and limitations.

8. Explain the architecture of NC system.

[Nov '19]

Refer chapter 4.3 on Page 4.13.

9. Describe four main features of CNC machines which distinguish them from conventional machine tools.

[Nov '15]

Refer chapter 4.3.1 on Page 4.14.

10. Discuss the major elements of CNC machine tools.

 [Dec '05]

Refer chapter 4.3.4 on Page 4.18.

11. Discuss the constructional features of a NC machine tool and explain their functions.

[May '15]

Refer chapter 4.3.5 on Page 4.21.

12. Explain the constructional and special features of CNC machine.

[Nov '17]

Refer chapter 4.3.5 on Page 4.21.

13. Narrate the design considerations of CNC machines.

[June '09, May'11 & Nov '18]

Refer chapter 4.3.6 on Page 4.24.

14. Discuss about slideways used in CNC machine tools.

[May'11]

Refer chapter 4.3.7 on Page 4.25.

15. What are the requirements of slideways?

[May '13]

Refer chapter 4.3.7 on Page 4.25.

16. Sketch and explain the following features of CNC machines:

(i) Hydrostatic slideways.

Refer Page 4.28.

(ii) Linear bearing with balls.

[May '12]

Refer Page 4.27.

17. Describe the spindle drives used in CNC machine tools.

[May '11]

Refer chapter 4.3.8 on Page 4.28.

18. Discuss about the closed loop system and open loop system with a neat sketch and with suitable example. 

[Dec '06, Dec '07, May'10, May'12 & Nov'13]

Refer chapter 4.4.1 on Page 4.33 for open loop system and chapter 4.4.2 on Page 4.34 for closed loop system.

19. List any five motions and control statements of computer assisted NC programming and explain.

[May'10]

Refer chapter 4.5 on Page 4.34.

20. What are the different types of control systems in Numerical Control?

[May '17]

Refer chapters 4.4.1 & 4.4.2 on Pages 4.33 & 4.34 respectively.

21. Discuss about the straight cut system and continuous system with a neat sketch and with suitable example.

 [Dec '06 & May'10]

Refer chapter 4.4.1 on Page 4.33 for straight cut system and chapter 4.4.2 on Page 4.34 for contour system.

22. Describe various types of CNC machine based on tool motion.

[May '16]

Refer chapter 4.4.1 for point-to-point system on Page 4.33 and chapter 4.4.2 for continuous path NC system on Page 4.34.

23. Describe the drive systems used in CNC machine tools.

[Nov '17]

Refer chapter 4.3.8 on Page 4.28 for spindle drives in CNC machines and chapter 4.8 on Page 4.47 for feed drive in CNC machines.

24. What are the special requirements of feed drives of CNC machines? Name also the method of speed control for each type.

[May '12]

Refer chapters 4.8 on Page 4.47.

25. With a neat sketch, explain the working of ATC.

[May'12 & Apr'18]

Refer chapter 4.11.2 on Page 4.66.

26. List the advantages of CNC systems over conventional systems.

[Dec '07 & May'14]

Refer chapter 4.13 on Page 4.71.

27. Compare NC and CNC system with the conventional machines.

Refer chapter 4.14 on Page 4.72.

28. What are turning centres? Why higher axes turning centres are used?

Refer chapter 4.15 on Page 4.73.

29. With a neat sketch, explain the constructional features of turning centres.

Refer chapter 4.15.1 on Page 4.74.

30. Briefly explain the types of turning centres.

Refer chapter 4.15.2 on Page 4.77.

31. List the advantages of CNC turning centres.

Refer chapter 4.15.3 on Page 4.78.

32. Explain in detail Machining Centre and its applications.

[May '13, Nov '13, May'16 & Nov '19]

Refer chapter 4.16 on Page 4.79.

33. With a neat sketch, explain the construction of horizontal spindle and vertical spindle machining centres.

Refer chapter 4.16.1 on Page 4.81.

34. Compare machining centre and turning centre.

Refer chapter 4.16.2 on Page 4.83.

35. What is the difference between point to point and continuous path in a motion control systems?

[Apr'19]

Refer Q19 on Page 4.96.