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Code No: V3213/R07

III B. Tech - II Semester Regular, Examinations, April/May 2011

METROLOGY AND SURFACE ENGINEERING

(Mechanical Engineering)

Time: 3 Hours Max. Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

*****

1. a) Describe briefly the system of obtaining different types of fits, with suitable

examples.

b) Differentiate between Hole basis systemand Shaft basis systemof fits, with

suitable examples.

2.

a) Differentiate between Work shop Gauges and Inspection Gauges.

b) Describe with neat sketches the differential screw micrometer and Depth

micrometer.

3.

a) By using optical flat and monochromatic light explain the procedure to determine

(i) whether the given surface is flat or curved. (ii) Whether the curved surface is

convex or concave.

b) What are interferometers? Explain working of any one Interferometer.

4. a) Staten the principle of operation of Mechanical and Optical comparators.

b) Describe with a neat sketch construction and working of an instrument used for

measurement of surface roughness.

5. a) Name the various types of pitch errors found in screw threads. Describe their

effects on the effective diameter.

b) Name and describe the following methods of measuring the major diameter of

external threads:

(i) using ordinary micrometer (ii) Using bench micrometer.

6. a) What is meant by alignment tests on machine tools? Name the various instruments

required for performing alignment tests on machine tools.

b) Describe the following tests on shaper: (i) Trueness and parallelism of vertical

ways (ii) Straightness and flatness of the table

7. a) Describe briefly the following method of tooth thickness measurement:

(i) Constant chord method and (ii) Base tangent method.

b) Name the commonly used Co-ordinate Measuring Machines; describe any one ofthem in detail.

8. a) What is overlay coating? State its purpose. How it is produced.

b) Briefly describe Electrostatic painting and Plasma spraying.

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Set No: 1

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Code No: V3213/R07







*****

1. a) Define the term Metrology as applied to Engineering Industry. State its significance.

b) Explain briefly the difference between the interchangeable manufacturing and selective

assembly.

2.

a) Describe the method checking the angle of a taper plug gauge using rollers, micrometer and

slip gauges.

b) Describe with neat sketches: (i) Inside Micrometer and (ii) Telescopic gauge.

3. a) Sketch and describe the principle of operation a Tool Makers Microscope.

b) What is an optical flat? Explain how interference fringes are formed when optical flat is placedon a surface to be tested.

4. a) Different applications demand different surface texture. Justify the statement.

b) Describe the principle and operation of Taylor Hobson Talysurf surface roughness

instrument.

c) What is a Comparator? State the various uses of comparators.

5. a) Name the important elements of thread which are required to be measured in order to determine

he accuracy of screw threads.

b) Explain with neat sketches the three wire method of measuring effective diameter of a screw

thread. How does it differ from two wire method?

6. a) What is meant by alignment tests on machine tools? Why they are necessary? Explain.

b) Name the different alignment tests to be performed on a drilling machine and explain any two

of them in detail.

7. a) Explain the reasons for inspecting gear tooth elements. Also describe in brief the various

methods used for inspecting in volute profile of a spur gear wheel.

b) Describe the construction and working of a Co-ordinate Measuring Machine.

8. Write Short notes on :

a)Acid pickling b) Ultrasonic degreasing c) Flame Spraying and d) Plasma Spraying

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Set No: 2


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Code No: V3213/R07







*****

1. a) Define the term Metrology as applied to Engineering Industry. State its significance.

b) Draw the conventional diagram of limits and fits and explain the terms: (i) Basic size

(ii) Upper deviation (iii) Lower deviation (iv) Fundamental deviation (v) Zero line.

2.

a) What are Snap gauges? Sketch and explain the use of limit gauges in mass production.

b) What are snap gauges? Sketch and describe an adjustable snap gauge.

3.

a) What is an Optical Flat? What are their types? State the limitations of optical flats.

b) What are interferometers? Explain working of any one Interferometer.

4. a) Define the following in connection with surface texture assessment.

(i)Roughness (ii) Waviness (iii) Lay (iv) Sampling length.

b) State the principle of operation of Electrical and Optical comparators.

5. a) Name the various types of pitch errors found in screw threads. Describe their effects on

the effective diameter.

b) Describe the following methods of measuring effective diameter of the screw threads:

(i) Thread micrometer (ii) one wire method.

6.

a) What is meant by alignment tests on machine tools? Distinguish between geometricaland practical tests on machine tools.

b) Name and justify the alignment tests to be performed on a shaper.

7. a) Explain the reasons for inspecting gear tooth elements. Explain the method of checking

gear tooth thickness.

b) Name the commonly used Co-ordinate Measuring Machines; describe any one of them

in detail.

8. a) Why it Is necessary to clean the surface before providing coating on it? What is

surface coating?

b) Describe the following mechanical coating processes:(i) Galvanizing and (ii) Electrostatic painting

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Set No: 3


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Code No: V3213/R07







*****

1. a) Define fits. Describe the various types of fits in brief.

b) Explain clearly what is meant by Selective assembly and Interchangeable assembly,

with suitable examples.

2.

a) State and explain the Taylors Principle of Gauge Design.

b) Explain the use of sine bar for measuring taper angle. What are the limitations of the

sine bar.

3. a) What is an auto collimator? Sketch and describe.

b) Describe the method checking the angle of a taper plug gauge using rollers,

micrometer and slip gauges.

4. a) State reasons for controlling the surface finish.

b) Describe the working of a Profilograph with neat sketch.

c) Describe in brief the construction and working of a mechanical comparator with neat

sketch.

5. a) Name the important elements of screw threads and describe briefly the errors in these

elements effect the working of the threaded elements.

b) Explain the Two wire and Three wire method of measuring effective diameter of

screw thread.

6. a) Distinguish between geometrical and practical tests on machine tools.

b) Name the different alignment tests to be performed on lathes. Describe any two of

them in detail.

7. a) Enumerate the various methods of measuring the tooth thickness and explain any two

of them.

b) Describe the construction and working of a Co-ordinate Measuring Machine.

8. Write Short notes on :

a) Flame spraying b) Overlay coatings c) Vapour degreasing d) ultrasonic degreasing

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Set No: 4


qp april2011 32 mec mse

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