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Course Code : AME1122 Reg. No :

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GAYATRI VIDYA PARISHAD COLLEGE OF ENGINEERING (AUTONOMOUS)Madhurawada, Visakhapatnam-530 048.

Affiliated to JNT University K, KakinadaB.Tech. V-Semester Regular & Supplementary Examinations, Dec-13/ Jan-1

Metrology(Mechanical Engineering)

Date : 11-01-2014 Time : 3 Hours Max. Marks : 60

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. Explain the following in 4 or 5 sentences.

a) Define the terms (i) allowance (ii) limits (iii) tolerance fit.b) Define Backlash in gear measurement.

c) Define the following in connection with surface texture (i) roughness (ii0 waviness.

d) Distinguish between mechanical comparator and electrical comparator.e) Explain best wire size method for screw thread measurement.f) Name the various types of errors in gears.

g) Name the various alignment tests performed on drilling machine.h) State the possible sources of errors in coordinate measuring machine.

2 Mark2 Mark

2 Mark

2 Mark2 Mark2 Mark

2 Mark2 Mark

2. a) Explain the procedure for converting a hole based fit into an equivalent shaft based fit.

b) Find the values of allowance and tolerances for hole and shaft assembly for the following of

mating parts.Hole limits are 25.00 and 25.05 and shaft limits are 24.95 and 24.98.

6 Marks

5 Marks

3. a) Explain how sin bar is used to measure angle of components of small size and large size.

b) State and explain Taylors principle of Gauge design.

5 Marks

6 Marks

4. a) With aid of neat sketches explain the principle of Tool makers microscope.

b) What are the two different types of optical flats? Explain their uses.

5 Marks

6 Marks

5. a) Name and describe the various Numerical methods of assessment of surface finish.

b) Explain the principle and construction of Tomlinsons surface meter with a neat sketch.

6 Marks

5 Marks

6. Explain the advantages and disadvantages of the following:

a) Mechanical comparatorb) Electronic comparator

c) Electrical comparatord) Pneumatic comparator.

11 Mark

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Course Code : AME1122 Reg. No :

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7. a) Define virtual effective diameter. How do you measure major and minor diameter andeffective diameter of screw thread.

b) Explain the principle and working of Parkinson Gear tester.

6 Marks

5 Marks

8. a) What is the importance of CMM in inspection process? Explain types of CMMs used ininspection.

b) Specify the diagrams how the following tests could be carried out on a lathe.(i) straightness of the bed horizontally and vertically.

(ii) the centers axis parallel to the bed.

6 Marks

5 Marks