Metrology and Surface Engineering(Mech)

Code No: V3213/R07 Set No. 1

III B.Tech II Semester Regular Examinations, April 2010METROLOGY AND SURFACE ENGINEERING

(Mechanical Engineering)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

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1. With a neat sketch, describe of the following and explain their working with anexample to each.

(a) Differential screw micrometer

(b) Depth micrometer. [8+8]

2. (a) What are interferometers? Name the various types of interferometer?

(b) What is the fundamental difference between the length and flatness interfer-ometer. [8+8]

3. (a) What are essential properties of a light wave for interference? Discuss withneat diagram.

(b) What do you understand by Moire fringes and how these are utilized foraccurate measurement? [8+8]

4. How the Tomlinson surface recorder and Talysurf machine work? What are theirrelative merits? [16]

5. Define the following terms and show them in sketches. Explain their method ofmeasurement.

(a) Pitch

(b) Maximum Diameter

(c) Effective Diameter

(d) Angle of thread. [4+4+4+4]

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

(b) Explain various instruments required for performing the alignment tests onmachine tools. [8+8]

7. Name any instrument to be used for checking the mass production of gears. Explainthe method of checking. [16]

8. Describe

(a) Porcelain Enameling

(b) Ceramic Coatings.

Give their applications. [8+8]

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1. Describe the procedure for deriving end standards from line standards with suitableexamples. [16]

2. What are the essential considerations in selection of materials for gauges and whatare the common materials used for gauges? Explain the various processes of man-ufacturing gauges? [16]

3. What are the most common aberrations found in optical projector? Explain howthey are caused. How can you overcome these? [16]

4. (a) Discuss the following terms in connection with surface finish measurements

i. Envelop method

ii. Crest line method.

(b) Describe the working principle of profilograph with help of neat diagram.[8+8]

5. (a) Describe an exclusive method for effective diameter measurement which showsvariation in drunken thread.

(b) Name the different elements required to be measured in order to determine theaccuracy of screw threads. Give a brief description of each of these elements.

[8+8]

6. Describe with neatly drawn sketches the following tests on lathe.

(a) Spindle taper bore run out.

(b) Chuck run out. [8+8]

7. (a) Briefly discuss various methods of checking gear tooth thickness.

(b) Define the term constant chord. Calculate the chord length and its distancebelow the tooth tip for a gear of module 3 and 200 pressure angle. [8+8]

8. Describe the terms:

(a) Tumbling

(b) Wire brushing

(c) Power Brushing

(d) Pre-Cleaning. [4+4+4+4]

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1. (a) Explain the effect of engineering allowance on the different types of fit requiredin Engineering manufacture.

(b) Discuss the effect of temperature on the application of limits and what pre-cautions and required during measurments. [8+8]

2. What do you understand by Moire fringes and how these are utilized for accuratelength measurement? How can these be used for angular displacement. [16]

3. Describe the application of optical flats and monochromatic light wave interferenceMethod in metrology. [16]

4. (a) What do you understand by the term ‘damping’ of an instrument?

(b) A level comparator has a vial radius of 200m, divisions 2.5mm apart andcontact feet at 10mm center distance. Calculate the difference in length oftwo gauges under comparison if the total bubble displacement is 5 divisions.

[8+8]

5. Discuss any two measuring instruments for the measurement of screw thread ele-ments with the help of neat sketches. [16]

6. (a) With the help of neat sketches. Explain the working of a differential screwtype micrometer.

(b) Describe the method of checking flatness and square ness with the axis of thespindle end of an external micrometer. [8+8]

7. Explain in detail the following methods of inspecting gear

(a) Concentricity & cylindricity

(b) Run out and axial slip. [8+8]

8. Describe the terms:

(a) Tumbling

(b) Wire brushing

(c) Power Brushing

(d) Pre-Cleaning. [4+4+4+4]

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1. Identify whether the following fits are hole based or shaft based. Convert them into equivalent other system.

(a) H7 - f8

(b) F6 - h4

(c) H5 - n4

(d) H7 - c6. [16]

2. Explain the classification of plain limit gauges? Sketch and explain any four typesof plug gauges? [16]

3. What are interferometers? Name the various types of interferometers? Explain anyone method in detail? [16]

4. (a) Write the advantages and disadvantages of stylus probe type instrument usedfor surface rougness measurement.

(b) Describe briefly some recent advances in the field of surface texture measure-ment. [8+8]

5. (a) Distinguish between left hand thread and right hand thread. Sketch thesethreads. Give few applications of each type.

(b) What are the different elements of a screw thread? What are the instrumentsused for the measurement of the above elements. [8+8]

6. Name the various alignment tests to be performed on a lathe. Describe any four ofthem in detail. [16]

7. Discuss the gear metrology of spur gears with reference to

(a) Lead

(b) Module. [8+8]

8. Write notes on the following explain what type of material used and why.

(a) Abrasive plating

(b) Degreasing. [8+8]

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Metrology and Surface Engineering(Mech)