Metrology & Surface Engineering B.Tech Question Paper : vardhaman.org
College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Mechanical Engineering
Semester : V
Subject : Metrology & Surface Engineering
Document type : Question Paper
Website : vardhaman.org
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Metrology & Surface Engineering Question Paper :
Four Year B. Tech V Semester Supplementary Examinations June – 2014
(Regulations : VCE-R11)
(Mechanical Engineering)
Date : 21 June, 2014 FN
Time: 3 hours
Max Marks: 75
All parts of the question must be answered in one place only
Related : Vardhaman College Of Engineering Dynamics Of Machinery B.Tech Question Paper : www.pdfquestion.in/6370.html
Unit – I :
1. a) Why is it necessary to give a tolerance on an engineering dimension? Give an example of both the bilateral and unilateral tolerances. 7M
b) Determine the dimensions and tolerances of shaft and hole having size of 30 H7 / h8 fit. Also determine the allowance and maximum clearance. 8M
2. a) What is basic dimension? Explain different ways of expressing tolerances. 7M
b) Determine the tolerances on the hole and the shaft for a precision running fit designated by 50H7/g6. 50mm lies between the range 30 – 50mm. i=0.46(D)1/3 + 0.001D,microns. Fundamental deviation for H hole=0. Fundamental deviation of g shaft=-2.5D0.34 . State the actual maximum and minimum sizes of the hole and shaft also, maximum and minimum clearances. 8M
Unit – II :
3. a) Discuss the desirable features of ‘End Standard’. 7M
b) With a neat sketch describe a method of measuring unknown angle of a component using sine bar.8M
4. a) With a neat sketch explain the principle of ‘GO’ and ‘NO-GO’ gauges. 7M
b) With a neat sketch explain the method of measuring taper using roller set. 8M
Unit – III :
5. a) Explain the construction of Autocollimator with a neat sketch? 7M
b) What is an optical flat? Describe how an optical flat is used in the measurement of flatness with the help of a neat sketch. 8M
6. a) What is a Thread comparator? How is this used in the measurement of effective diameter of internal threads? Explain with a sketch. 7M
b) How is three wire method used to measure the effective diameter of a screw? Explain with the help of a sketch? 8M
Unit – IV :
7. a) Describe the classification of surface roughness parameters involved in evaluation of surface finish. What are the factors affecting surface roughness? 7M
b) What are the methods of measuring surface finish? Explain briefly. What is microscopic inspection and micro interferometer? 8M
8. a) What is a profilometer? Explain with a neat sketch the Tomlinson surface meter. 8M
b) What are the advantages and disadvantages of mechanical comparators and optical comparators respectively? 7M
Unit – V :
9. a) What are Coordinate measuring machines (CMM)? Mention their types. 8M
b) What are the different remedial measures for protecting the surface from corrosion? 7M
10. a) What is surface treatment process? Explain briefly. 8M
b) List various organic and in-organic coatings. Briefly discuss this with applications. 7M
B. Tech V Semester Regular Examinations, December – 2013 :
(Regulations: VCE-R11)
Metrology And Surface Engineering :
(Mechanical Engineering)
Date : 14 December, 2013
Time : 3 Hours
Max. Marks : 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
Unit – 1 :
1. a) Define Fit. Give classification of different types of fits and explain each of them with suitable example. 7M
b) Calculate the limits of tolerance allowance for a 35mm shaft and hole pair designated H8d9. The following assumptions may be made, 35mm lies in diameter step of 30 and 50mm. The IT grades for IT8 and IT9 are 25i and 40i. The fundamental deviation for ‘d’ shaft is given by -16D0.41microns. 8M
2. a) Explain the need for providing tolerance on a dimension. Explain the difference between Allowance and Tolerance. 7M
b) A hole and shafting system has the following dimensions 50[H8/c8]. The standard tolerance is given by i=0.45(D)1/3 +0.001D, where D=dia(mm) of geometric mean of steps i=standard tolerance, microns. The multiplier for grade IT8 is 25i. The fundamental deviation for shaft c, for D>40mm is given by –(9.5+0.8D) microns. The diameter range lies between 50 to 80mm. Sketch the fit and show these upon the actual dimension of hole and shaft. 8M
Unit – 2 :
3. a) State the Taylor’s principle for the design of limit gauges. Draw a diagram to show the different classes of fit which can be obtained in a hole based system. 7M
b) Calculate the dimensions of plug and ring gauges to control the production of 50mm shaft and hole pair of H7d8 as per I.S specification. The following assumptions maybe made , 50mm lies in diameter step of 30 and 50mm and the upper deviation for ‘d’ shaft is given by -16D0.41 and lower deviation for hole H is zero. Tolerance factor i(microns) = 0.45(D)1/3+0.001D and IT7 = 16i and above IT8=25i. Calculate the 10% gauge tolerance and wear tolerance of the shaft and hole. 8M
4. a) Draw a schematic diagram of a mechanical bevel protractor with Vernier and optical angle attachment, explain briefly. 7M
b) What is an angle gauge? Also write the uses of angle gauges. 8M
Unit – 3 :
5. a) Explain the construction of Tool maker’s Microscope with a neat sketch and give its applications. 7M
b) Describe with a neat sketch the measurement of major diameter of a screw thread using fudicial dial indicator. 8M
6.a) Explain the different ‘screw thread’ errors commonly encountered during manufacturing. How can they be identified? Give remedies for their elimination. 7M
b) Compare 2-wire and 3-wire methods of measuring the effective diameter of a screw. 8M