bookspar · mechanical measurements and metrology max. marks: 1,.. ... and b. (05marks) note:...

Fourth Semester B.E. Degree Examination, Dec.2014/Jan.2015Mechanical Measurements and Metrology

Max. Marks: 1.\j,.

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"~ (05 Marks)ith neat sketches.

(10 Marks)t' used in calibration of

e compared with the meteraping A and B, it was found thatand B. (05 Marks)

Note: Answer FIVE full questions, selectingatleast TWO questions from each part.

a. :E>efin,e.metrology.What are the objectives of metrology?b. Expkf " " mperial standard yard" and "International prototype met '

c. A calibrated eter end bar has an actual length of 1000.0002two bars A antI , each having a basic length of 500 mID.bar LA + LB wasff01.indto be shorter by 0.0003 mID. In coA was 0.0004 mnll n er than B. Find the actual length 0;

1""a. Differentiate: i) unil~eral and bilateral tolerances '- clearance fit and interference fit.

(06 Marks)b. Determine the dimensions of ail: and hole for. fit 30 H7fs. The given data are:

/i = 0.45® + 0.00 ID microns. Funoamental <l0'viationfor f shaft is _5.5D°.41microns, 30 mmfalls in the diameter step 0 f 18 an f'" Tolerance grade for IT7 and IT 8 are 16i and 25irespectively. Also design plug gauge'~o.(e ck the above hole. Take wear allowance as 10%of the gauge tolerance. I (10 Marks)

c. Explain: i) Shaft basis syste ii) Hole basi (04 Marks)

a. With a neat sketch, explain the construction a d working of Johannsoncomparator. ~ J ~

b. Explain with a neac) etch, the working of Solex pgumatic comparator.advar:tages? 0 }'

c. Explain the pFin . Ie of sine bar. ;:R:f }'

a. With a ~at sketch, explain the working principle of an autocollim to . (06 Marks)b. Defin ~'Effective diameter". Explain the 3-wire method of finding t Ii, ctive diameter of

s ". I {breads. "7... (08 Marks)

c. Explain with a sketch, how the chordal thickness is measured by using g tooth verniercaliper. }' ~ 6 Marks)

Mikrokator(08 Marks)

What are its(08 Marks)(04 Marks)

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a. Defme measurement. With a block diagram, explain the generalized measurement syswith a suitable example. (08 Marks

b. Defme the following terms: i) precision ii) hysteresis iii) sensitivity. (06 Marks)c. Explain the principle of capacitive type electrical transducer. With a sketch explain anyone

type of capacitive transducer. (06 Marks)

6 a. Explain the inherent problems present in mechanical modifying system.b. With a block diagram, explain the general telemetering system.c. Explain with neat sketches: i) stylus type oscillograph ii) x - y - plotter.

(06 Marks)(06 Marks)(08 Marks)

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a. Sketch and explain the analytical balance (equal arm balance).b. Explain how the torque is measured using prony brake dynamometer.

disad vantages?c. Describe the working principle ofpirani gauge with a sketch.

(08 Marks)What are its

(06 Marks)(06 a

8 a. State the laws of thermocouples.~ Explain the construction and working of optical pyrometer.

c. ""IDefinegauge factor. Explain the wheat stone bridge arrangement for straiJe ~,/0- V\

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