mechanical measurement & metrology jan 2014

USN TOME/AU32B Third Semester B.E. Degree Examination, Dec.2013 lJan.20l4 Mechanical Measurements and Metrology Time: 3 hrs. Max. Marks:100 Note: Answer FIVEfull questions, selecting at least TWO questions from each part. PART _ A a. De{ine metre in terms of wavelength standards. List the advantages of wavelength standards (06 Marks) (08 Marks) mm longer. Determine the actual dimensions of all the four end over itaterial standards. b. Describe with a neat sketch: i) Imperial standard yard ii) Wringing phenomena of slip gauges c. Four length bars of basic length 100 mm are to be calibrated,using a calibrated length bar of 400 mm whose actual length is 399.9992 mm. It was also found that length of bars B, C and D in comparison to A are +0.0002 mm. +0.0004 mm and -0.0001 mm respectively and the length of all the four bars put together in comparison to standard calibrated bar is +0.0003 c) () (.) CB o. (.) (.) ! 8e 6v 7r' -t o0' =oo .: c.l HOO oJtr =o 71. - a: oO o0c -€ or= p-A o'' o_i o= AE G; :9 v, ^: -40 o= qo tr> Xo o rJ< -i c.i o o Z L a. Differentiate between: i) Hole basis and shaft basis system of tolerances ii) Interchangeability and selective assembly. b. Write notes on: i) Compound tolerances ii) Gauge tolerance. Marks) (08 Marks) (06 Marks) (06 Marks) (06 Marks) (08 Marks) (06 Marks) 3a. b. c. (08 Marks) (08 Marks) (08 Marks) Show the arrangement of angle gauges, with a neat sketch by selecting minimum number of gauges for the angles 32'15'33" and54o36'42". ',,. (04 Marks) 4 a. What is the best size wire? Derive an expression for the same in terms of the pitch and angle , of the thread. b. Explain 3-wire method of measuring effective diameter of screw thread. c. Explain the principle of interferrometry. Write a note on optical flat. PART - B 5 a. With a neat block diagram, explain the generalized measurement system with an example to c. Determine the dimensions of hole and shaft for a fit 30H8f7. The given data arc: i:0.45Dr/r + 0.001D. IT8 :25i.1T7: l6i. Fundamentaldeviation for shaft'f is -5.5D0+r. 30 mm diameter lies in the diameter step of 18-30 mm. Sketch the fit and comment on the same. Explain with a neat sketch, the working of Solex pneumatic gauge, Explain with a neat sketch, the construction and working of LVDT. each stage. b. Distinguish between: i) Primary and secondary transducers ii) Active and passive transducers c. Define the following terms with reference to measurement system: i) Calibration iii) Hysterisis ii) Sensitivity iv) Threshold value For More Question Papers Visit - www.pediawikiblog.com For More Question Papers Visit - www.pediawikiblog.com www.pediawikiblog.com

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Page 1: Mechanical Measurement & Metrology Jan 2014

USN TOME/AU32B

Third Semester B.E. Degree Examination, Dec.2013 lJan.20l4

Mechanical Measurements and Metrology

Time: 3 hrs. Max. Marks:100Note: Answer FIVEfull questions, selecting

at least TWO questions from each part.

PART _ Aa. De{ine metre in terms of wavelength standards. List the advantages of wavelength standards

(06 Marks)

(08 Marks)

mm longer. Determine the actual dimensions of all the four end

over itaterial standards.b. Describe with a neat sketch:

i) Imperial standard yardii) Wringing phenomena of slip gauges

c. Four length bars of basic length 100 mm are to be calibrated,using a calibrated length bar of400 mm whose actual length is 399.9992 mm. It was also found that length of bars B, C and

D in comparison to A are +0.0002 mm. +0.0004 mm and -0.0001 mm respectively and thelength of all the four bars put together in comparison to standard calibrated bar is +0.0003

c)()(.)CB

(.)

(.)!

6v7r'-to0'=oo.: c.l

HOO

oJtr=o

71. -

o0c

-€

or=

p-Ao''o_i

AEG;:9v,^:-40o=qotr>Xoo

rJ<-i c.i

ooZ

a. Differentiate between:i) Hole basis and shaft basis system of tolerancesii) Interchangeability and selective assembly.

b. Write notes on:i) Compound tolerancesii) Gauge tolerance.

Marks)

(08 Marks)

(06 Marks)

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

3a.b.c.

(08 Marks)

(08 Marks)(08 Marks)

Show the arrangement of angle gauges, with a neat sketch by selecting minimum number ofgauges for the angles 32'15'33" and54o36'42". ',,. (04 Marks)

4 a. What is the best size wire? Derive an expression for the same in terms of the pitch and angle, of the thread.

b. Explain 3-wire method of measuring effective diameter of screw thread.c. Explain the principle of interferrometry. Write a note on optical flat.

PART - B5 a. With a neat block diagram, explain the generalized measurement system with an example to

c. Determine the dimensions of hole and shaft for a fit 30H8f7. The given data arc:i:0.45Dr/r + 0.001D. IT8 :25i.1T7: l6i. Fundamentaldeviation for shaft'f is -5.5D0+r.30 mm diameter lies in the diameter step of 18-30 mm. Sketch the fit and comment on thesame.

Explain with a neat sketch, the working of Solex pneumatic gauge,Explain with a neat sketch, the construction and working of LVDT.

each stage.

b. Distinguish between: i) Primary and secondary transducersii) Active and passive transducers

c. Define the following terms with reference to measurement system:i) Calibrationiii) Hysterisis

ii) Sensitivityiv) Threshold value

For More Question Papers Visit - www.pediawikiblog.com

www.pediawikiblog.com