JNTU
JNTU B.Tech III ENGINEERING METROLOGY Previous Question Paper (January/February - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is a deviation?
Answer
A deviation is the algebraic difference between a size (actual, limit, etc.) and its corresponding basic size. It is the amount by which the actual dimension of a part varies from the specified nominal or basic dimension.
Compare and contrast interchangeable and selective assembly.
Answer
Interchangeable assembly involves producing components within specific tolerance limits such that any part can be randomly selected from a batch and assembled without further modification. It enables mass production and easy replacement of parts but requires high-precision manufacturing.
Selective assembly involves manufacturing parts to wider tolerances and then sorting them into groups (grades) based on their actual sizes. Matching parts from corresponding groups ensures a proper fit. While it allows for lower production costs, it complicates inventory management and assembly processes.
Explain the principle of working of spirit levels.
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Differentiate between line and end standards.
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Why cast iron is a preferred material for surface plates and tables?
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What are the advantages of optical measuring instruments?
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What is the effect of stylus size on the profile recording of the surface?
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Give the list of various instruments used for testing the surface roughness and mention their advantages.
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What is the difference between comparator and measuring instrument?
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What are the different errors observed in screw threads?
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Part B
Explain how the concept of limits and tolerances can be applied for proper control of size during inspection of produced component.
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Describe the principal features of British standard system of limits and fits for screwed work.
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Explain the effect of the engineering allowances on the different types of fit required in engineering manufacture.
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A steel shaft is made within limits on its diameter of 60.02mm and 59.96mm. State the upper and lower limits of the bore size of a bush to give a maximum clearance of 0.10mm and a minimum clearance of 0.02mm.
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Describe how the taper of a plug gauge is measured using Sine bar.
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Describe the working principle of dial indicator with gear and pinion mechanism.
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Explain how slip gauges can be calibrated by brook level comparator.
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Explain Taylor’s principles of gauge design.
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Describe Michelson’s interferometer.
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Sketch and explain the use of auto collimator for straightness measurement.
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Sketch and explain an optical projector. How do you change the magnification of the image?
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Explain the basic principle of collimator. What are the applications?
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With the help of a neat diagram, explain the components of a surface texture.
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What are different orders of surface irregularities? Explain in detail.
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Differentiate between primary texture and secondary texture.
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Describe various methods of numerical assessment of surface finish.
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Explain the industrial applications of CMMs.
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Describe various alignment tests to be conducted on lathe machines.
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Explain the construction and working of pneumatic comparator.
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Explain how the minor diameter of external thread can be measured using a micrometer?
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