Mcq e45e

1. The number of slip gauges in a set are (a) 87 (b) 45

(c) 103 (d) 31 (e) all of these 2. The advantages of vernier caliper over micrometer is that it (a) is easier and quicker to use (b) is more accurate (c) can be used to make both inside and outside measurement over a range of

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sizes (d) all of these Most accurate instrument is (a) Steel scale (b) Micrometer screw gauge (c) Vernier caliper (d) Optical projector Bevel protractor is used for (a) Angular measurement (b) Linear measurement (c) Height measurement (d) Flatness measurement A comparator (a) Needs to be calibrated (b) Need not be calibrated (c) Contains a calibrated scale (d) Is highly accurate over its complete measuring range The essential condition for inter – ferometry measurement is (a) An air gap(a wedge) of varying thickness must exist between the two surfaces (b) An optical flat is required (c) Work surface must be reflective (d) Monochromatic source of light is required (e) All of these A sine bar is specified by (a) its total length (b) centre distance between the two rollers (c) size of the rollers (d) weight of sine bar

 xplain the term ‘Accuracy’  What are the objectives of engineering metrology?  Define Least Count of vernier Caliper  What precautions should be taken while using slip gauges?

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Define Pitch Define Backlash What is a Comparator? What is microscopic inspection? What is meant by alignment tests on m/c tools What is meant by radial play? Distinguish between Line standard & End standard State the principles of optical measuring instruments What is sine bar? Give its uses Write short note on Angle dekkor. Describe any one method of measuring effective diameter of internal threads

6. 1. a) Describe the following types of errors and state how they can be taken care of. (i)Environmental error (ii) Parallax error (6) b)Define Precision and Accuracy (OR) 2. Name the various methods of measurements and explain any three of them with suitable examples.(10) 17. 1. State the principle of Vernier instrument explain briefly the construction and use of vernier caliper with a neat sketch. (10) (OR) 2. a) Explain a sine bar used for angular measurements b) Explain measurement of Tapper Shaft. 18. 1. Describe the following methods of measuring the effective diameter of the screw threads: (i) Thread micrometer method ii) One wire method (OR) 2. Describe the Parkinson’s gear tester and state its limitations. 19. 1. a) With the help of a neat sketch describe the principle of working of a mechanical Comparators. (6) b) Explain simple optical comparator. (OR) 2. What are roughness comparison specimens? How they assess surface specimen? What are their limitations? 20. 1. Explain the procedure of ‘alignment tests’ to be done on a milling machine. (10) (OR) 2. Explain the procedure of ‘alignment tests’ to be done on a lathe. 1. Explain the term ‘Precision’ 2. What are precision linear measuring instruments? 3. What is the Least Count of Vernier Caliper and Micrometer? 4. Define linear measurement

5. Give formula for (i) Base pitch (ii) Dimetral pitch 6. Define Run out. 7. Give reasons Mechanical comparators are less accurate as compared to optical comparators. 8. Which instrument is used for measuring surface finish deep bores? 9. What are the applications of autocollimeter? 10. What is the effect of keyway cut on a shaft? Part B 11. Name the various types of errors in gears. 12. What are the advantages & disadvantages of electrical comparator. 13. Explain the term (i) Ra value (ii) Rz value 14. What are the geometrical checks to be done on a m/c tool? 15. What is meant by alignment tests on m/c tools? Why they are necessary? Explain. Part C 16. 1. a) What are the objectives of metrology. (4) b) Explain principles of mechanical measuring instruments. (6) OR 2. Explain the measuring of external angle of a component using any one type of precision measuring device with suitable sketch. (10) 17. 1. State the principle of a micrometer. Sketch a outside micrometer and name its various parts. OR 2. Explain construction and Vernier bevel protractor and optical bevel protractor. (10) 18. 1. With the help of a neat sketch explain the construction, working and applications of toolmakers microscope. (10) OR 2. a) What are the sources of errors in manufacturing of gears? (5) b) Explain measurement of concentricity. (5) 19. 1. Name the various methods of inspecting the surface finish by comparison. State their advantages and limitations. (10) 2. Describe the construction and working of a optical projector. (10)

20. 1. Explain the procedure of ‘alignment tests’ to be done on a drilling machine. (10) OR 2. Distinguish between alignment test and performance test of a machine tool. Discuss with neat sketches, how you would test any three of the following for a lathe. (i) Spindle centre run-out (ii) Spindle taper bore run out (iii) chunk run out (iv) Cross slide alignment (10)