7/26/2019 AME_1122_METROLOGY, 09-05-2012, MAY_2012

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Course Code : AME1122 Reg. No. :

GAYATRI VIDYA PARISHAD COLLEGE OF ENGINEERING (AUTONOMOUS)Madhurawada, Visakhapatnam

Affiliated to JNT University K, KakinadaB. Tech. V-Semester Supplementary Examinations, April/ May 2012

Metrology(Mechanical Engineering)

Date : 09/05/2012 Time : 3 Hours Max. Marks

1. Question No. 1 is Compulsory.

2.

Answer any FOURfrom questions 2 to 8.3. All parts of a Question must be answered in one place to get valued.

1. Answer the following in 4 or 5 sentences.

a) State the conditions when the shaft based is used for limits and fits.b) What is limit gauging?

c) Why monochromatic light is used in interferometry?d) What is meant by direction of Lay?

e) What are the advantages of electrical and electronic comparators?f) Name the various methods for measuring pitch diameter.

g) List out various elements of gear tooth.h) Name the various instruments required for performing the alignment tests on machine tools.

2 Mark2 Mark

2 Mark2 Mark

2 Mark2 Mark

2 Mark2 Mark

2. a) Draw the conventional diagram of limits and fits and explain the terms.

b) Distinguish between tolerance and allowance.

8 Mark

3 Mark

3. a) Explain the use of sine bar for measuring the angle of taper plug gauge with the help of

neat sketch.b) Explain with the help of neat sketch the principle and construction of an Auto collimator

6 Mark

5 Mark

4. a) Discuss the following terms in connection with surface finish measurements(i) Waviness (ii) Roughness (iii) Centre line profile

b) In the measurement of roughness, the heights and successive 16 peaks and troughs weremeasured from the datum and were 18, 42, 25, 35, 22, 36, 18, 42, 22, 32, 24, 36, 16, 38,

23, 40 microns. If these measurements were obtained over a length of 30 mm, determine(i) Ra (ii) Rz (iii) RMS

3 Mark

8 Mark

5. a) Briefly describe major, minor and effective diameter of thread.

b) Derive the formula for measuring the effective diameter of thread by 3-wire method.

3 Marks

8 Marks

6. a) What are the important uses of optical projectors?b) Sketch a setup for checking cylindrical plug gauge with reference to gauge blocks and

optical flats and explain how testing is done?

4 Marks7 Marks

7. With neat sketch explain the various types of CMM based on its construction. 11 Mark

8. Explain the following :

(i) Alignment tests on lathe(ii) Alignment test on Drilling Machine

11 Mark

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