### ME8501- Metrology and Measurments - Unit-4 Two marks

__Subject Name:__ Metrology and Measurments

__Subject Name:__

__Subject Code:__ ME8501

__Subject Code:__

## B.E. Mechanical Engineering - semester 05

Anna University Regulation 2017 Mechanical 5th sem ME8501(

**Metrology and Measurments**) 2 marks for 4th unit is provided below. ME8501 all units 2 marks,**Metrology and Measurments all units notes**, syllabus are listed down for students to utilize it for scoring maximum marks with our study materials.## 1.Name the various types of pitch errors found in screw.

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## 2.Name the various methods of measuring the minor diameter of the thread.

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## 3.Name the various methods used for measuring major diameter.

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## 4.Define the effective diameter of thread.

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## 5.Name the various methods for measuring effective diameter.

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## 6.Name the various methods for measuring pitch diameter.

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## 7.Define periodic error.

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## 8.What are the commonly used forms of gear teeth?

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## 9.What are the types of gears?

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## 10.Define Lead.

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## 11.Define lead angle.

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## 12.What are the various methods used for measuring the gear tooth thickness?

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## 13.Why is monochromatic light used in interferometry instead of white light?

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## 14.Define Module.

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## 15.The outside diameter of a gear is 110mm and the number of teeth is 20. What is the module of gear?

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## 16.Name four gear errors.

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## 17.Name the methods used for checking the pitch of the gear.

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## 18.What are the direct angular measurements methods?

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## 19.Define constant chord.

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## 20.Give the formula for measuring radius of circle.

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## 21.What are the two methods used in measuring radius of concave surface?

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## 22.What are the factors affecting surface roughness?

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## 23.Define the term cut-off length with respect to surface roughness measurment.

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## 24.Define lays. Mention any four of its type.

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## 25.What are the methods used for evaluating the surface finish?

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## 26.Define degree of fullness and degree of emptiness in form factor.

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## 27.What are the methods used for measuring surface roughness?

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## 28.What are the stylus probe instruments?

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## 29.Define straightness of a line in two planes.

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## 30.Define straight edge.

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## 31.Compare straightness test by using spirit level and auto collimator.

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## 32.Define roundness and name the four measurement of roundness.

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## 33.Name the devices used for the measurement of roundness.

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## 34.Define Cancentricity.

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## 35.What is gear runout?

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## 36.How the accuracy of a straight edge in specified and how it can be checked?

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## 37.What is secondary texture of a surface?

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## 38.Define the term 'cut-off length' with respect to surface roughness measurement.

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## 39.Name the various stylus probe instruments used for surface finish measurement.

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## 40.Mention the purpose of Goniometric heads in Tool maker's microscope.

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## 41.List the reasons for the occurrence of progressive pitch errors in screw threads.

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## 42.Name the two corrections to be applied for the measurement of effective diameter.

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## 43.What is meant by "Best size wire" in screw thread measurement?

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## 44.How Taylor's principle is applied to screw thread gauge?

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## 45.Explain drunken error in screw threads.

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## 46.What is the effect of flank angle error?

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## 47.What are the applications of toolmaker's microscope?

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* Regulation 2017 ME8501 Metrology and Measurments All units notes

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