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Tuesday, September 6, 2016



Roll no.                                                                                                                      Reged. No. ....................                                                                                                                     
M.TECH,    2014
METROLOGY  AND INDUSTRIAL  INSPECTION
Subject code: PE-521
Paper ID: [E0456]
Time: 3 Hrs.                                                                                                 Max Marks:  100
Note: Attempt any five questions. Questions carry equal .  Missing data if any may be suitably assumed.
Q1.
a)     State the present  definition of meter. What is repeatability of this standard?                       (3+3=6)
b)    Three 100mm of end bars are measured on a level comparator by first wringing                                            them together and comparing with a 300mm bar  and then inter-comparing them.                                                        The 300mm bar has a known error of 40mm and the three 0bar together measure 64mm less then e the 300mm bar. Bar A is 18mm longer than bar B and23mm longer than bar c. find length of bar A. B and C.                                                                                                                 

Q2.

a)     Stats an optical property of the surface which enables an autocollimator to be used for 16 angular measurement.

b)    Describe and sketch the principle  of auto collimation. An autocollimator may be used for testing alignment at right angles to a datum. Show how this may be carried out  and described with the aid of sketches and accessories used.                                                                         
Q3.
a)     A cylindrical component is required to be straight within 0.015mm and round within a tolerance of 0.01mm .Suggest a practical way of measuring these in the workshop.

b)    State the reasons of formation of various irregularities found in the  surface texture. Show how surface having  the same  numerical assessment may have  different properties of texture.   

Q4.        Explain in detail any of the absolute length gauge interferometer.               

Q5.      Describe any one of the optical comparators . Derive an expression for its magnification.        

Q6.       With a neat diagram, show clearly these essential principles or movement 0of a machine designed to measure the effective diameter of an external thread  using two wire system.   

Q7.        Explain with the aid  of a diagram a typical ‘rolling’ gear tester. Describe  four different tests               which can be carried out in this equipment and state the information you would expect together from each test.

Q8.        

a)     Write different criteria for selection of  gauging equipments.                                                    
b)    A random sample was taken of the internal mean diameter of nuts  produced by a
 manufacturer .The mean was 7.5mm with a standard deviation of 0.1mm . If nuts having a diameter of 7.375  and 7.583mm are acceptable what percentage is rejected?                                                     




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