AU2037 - METROLOGY AND INSTRUMENTATION

QUESTION BANK

PART – A  (2 Mark QUESTIONS)

UNIT -1
1.            Define the following terms :
i)       Sensitivity….
iii)     Repeatability ….
iv)     Reproducibility….
v)      Interchangeability….
vi)     Reliability….
vii)    Uncertainty ….
viii)   Need of Calibration……. of an Instrument
2.            Distinguish between Line and End standards.  Give examples.
3.            Define Abbe’s principle of measurement.
4.            Define static and dynamic characteristics (static and dynamic response) of a measuring instrument.
5.            Discuss about fundamental and derived units in detail.

UNIT – 2
1.What is wringing of slip gauges?
2.What are the standards of slip gauges?
3.What is a Limit gauge?  Write the Taylor’s principle of gauge design.
4.Explain the working principle of Laser micrometer.
5.What is a comparator?  Classify comparators.

PART – B QUESTIONS ( 16 marks QUESTIONS)

UNIT -1

1.Write down the differences between Precision & Accuracy
2.Differentiate random errors from systematic errors
3.Explain the types of errors with examples
4.Explain the causes of errors with suitable examples
5.Explain the classification of measuring methods.

UNIT – 2

1.Explain the working principle of Johansson ‘Microkator’ with a neat sketch
2.Explain with a sketch the working principle of Sigma comparator
3.With a neat sketch, Describe the principle of Solex Pneumatic Comparator
4.With a neat sketch, explain the working principle of micro optic Autocollimator.
5.With a neat sketch, explain the working principle and applications of Angle Dekkor.
6.Briefly explain the various elements of Optical Bevel Protractor with a neat sketch.

Q.1Bring out differences between form joint and spring caliper. Draw neat sketches of both types for measuring diameters – inside and outside. (10)

Q.2Describe the construction of a micrometer and the procedure of reading on it. The sleeve of a micrometer is graduated in mm. The thimble is graduated in 50 divisions. It takes two complete rotations of thimble for spindle to advance through one mm. During a particular measurement 8 divisions on sleeve are clear of the thimble and 10th division is coinciding with the reference line. Give the least count and reading. (10)

Q.3What function does LVDT serve in measurement? Explain its function with the help of a sketch. Explain the principle of a strain gauge.(10)

Q.4What is a comparator? State different types of comparators. Compose mechanical comparator with electrical comparator. What is the principle of a pneumatic comparator? (10)

Q.5What is a side bar? Explain its use with the help of a dial indicator. How do you make a gauge block build up? (10)

Q.6Sketch a universal level protractor and state why it is called universal in comparison with a normal protractor. Explain what angle gauges are and where they are used? (10)

Q.7State principle of optical projector and explain how the image is obtained on the screen. What are different applications and advantages of optical projector in production? (10)

Q.8What is a coordinate measuring machine and what advantages does it offer in measuring various manufactured parts. “In computer aided manufacturing, CMM has an important role to play”. Justify this statement. (10)

Q.9Two closely placed light sources emit light waves of same angular frequency but different phase angles. Write down equations for two waves. On reaching a point at a distance D from the sources the two waves are superimposed. Find the resultant wave. Explain constructive and destructive interference and their results. (10)

Q.10What are different light sources used in interferometer? Explain how interferometry can be used in finding vertical difference between two points on a machined surface. (10)