B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010

Fifth Semester

ME 2304 — ENGINEERING METROLOGY AND MEASUREMENTS

Mechanical Engineering

(Common to Production Engineering)

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

PART A — (10 × 2 = 20 Marks)

1. Distinguish between 'Line Standard' and 'End Standard'.

2. Define the term 'Sensitivity' of an instrument.

3. What is meant by wringing of slip gauges?

4. What are limit gauges?

5. What is meant by 'Best size wire' in screw thread measurement?

6. Define the term 'constant chord' of a gear.

7. What are the advantages of laser interferometer?

8. What is a CNC CMM?

9. What are load cells?

10. What is the working principle of bimetallic thermometer?

PART B — (5 × 16 = 80 Marks)

11. (a) (i) Draw the block diagram of a generalized measurement system and explain the various stages with an example. [Marks 10]

(ii) Distinguish between 'Precision' and 'Accuracy' with suitable examples. [Marks 6]

Or

(b) (i) Describe Systematic errors and Random errors. Discuss the means adopted to minimize these errors. [Marks 12]

(ii) Explain the term 'interchangeability'. [Marks 4]

12. (a) (i) Explain, with a neat sketch, the construction and working of a Tool Maker's Microscope. [Marks 8]

(ii) Explain, with a sketch, the construction and working of Solex Pneumatic Comparator. [Marks 8]

Or

(b) (i) What is the principle of Angle dekkor? How is it used for the measurement of angles? [Marks 8]

(ii) Explain the use of an optical flat to test the flatness of measuring surfaces. [Marks 8]

13. (a) (i) Explain the principle of measuring gear tooth thickness by Base tangent method. [Marks 8]

(ii) With a neat sketch, describe the construction and working of a profilometer. [Marks 8]

Or

(b) (i) Derive the formula for measuring the effective diameter of a screw thread by three-wire method. [Marks 8]

(ii) Define straightness. Describe any one method of measuring straightness of a surface. [Marks 8]

14. (a) (i) With a neat sketch explain the working of laser interferometer.[Marks 8]

(ii) Discuss the need of computers in inspection. [Marks 8]

Or

(b) (i) Describe the construction and operation of a coordinate measuring machine. [Marks 12]

(ii) State the advantages of CMM. [Marks 4]

15. (a) (i) Explain the principle of operation of a hydraulic dynamometer. [Marks 8]

(ii) Explain the principle of operation of Bourdon tube pressure gauge.

[Marks 8]

Or

(b) (i) Explain the working of a rotameter with a neat sketch. [Marks 8 ]

(ii) Using a sketch, explain the working of an optical pyrometer. [Marks 8]

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Question Paper Code : 55466

B. E. / B.Tech. DEGREE EXAMINATION, NOVEMBER/ DECEIT{BER 2O,1 11.

Fifth Semester

Mechanical Engineering

ME 2304

ENGINEERING METROLOGY AND MEASUREMENiS

-

(Common to Production Engineering)

(Regulation 2008)

Engineering Metrologl and Measurements for B.E.

{Common to PTME 2304

Time : Three hours Maximum : 100 marks

(Part-Time) Fourth Semester - MechAniial Englneering - Regulation 2OO9)

Ansrr4g,r A,LL qtrestions.

PART A -,t10, x 2,.=,2O marks)

1. Define the term error and'eorrection.

2. What is meant by nominal *ir" ana toferance?

3. What will happen if the gauge blocks are just simply placed one over

4. What are sine centers?

5. Name the Corres,tions applied in measurement of effective diameter by the

6. State the rnethord$ used for checking gear tooth profile.

7" What is tlre advantage of using laser beam in interferometry?

8. Name the types of accuracy specifications used for CMM.

9. List qny two methods employed for measuring torque.

10. Give the eomposition and useful temperature r€rnge of any one commercial another and measurements are made?

method of wires.

therrhocouple?

PARTB-(5x16=80marks)

11. (a) (il Draw tlle block diagfam of the functional elements of a pressure

g"rg" and explain the functions of different functional elements. (10)

Explain with examples the difference between a Pr-i!44ry and a

(ii) ""JL"a"w standard. What are working standards? (6)

Explain tl.e following terms in precision rleasureltlents,: t8)

(1) RepeatabilitY ':' :"'

{21 SensitivitY

(3) Lag ::

(4) Derived unit.

Explain dilferent sources of errors. (8)

(ii) State the main requirements of slip gauges' How are slip gauges manufactured? (6)

DescribetheConstructionatdetailsofanAngleDeckerand

(ii)

"*pf"ir how it is used'te meas-ure tlie angle' (101

Explain how flatness 6rrors''of lapped with an oPtical flat.

Explain how the geasuring head sensitivity' pneumatic

(ii)

serisitivity and overali Censitivity vary with variation of diameter oi *""*niument orifice. (10)

With the help of a neat sketch explain the function of a

p"1.a*;;; c"i, nouirrg Tester used for checking of composite

Grrors. (10)

(ii}-Explairiasrpical"gfup":'Tgwhichthemeasurementofsurface

Or

(b) (i) ,,.""

(a) (4

L2,

,Or

(b) (i)

surfaces are measured

(6)

13. (a) (i)

,,,' ''l-'',',,. F,ri*-toratEiJ".eiscarried-out' (6)

Or

tb) {i} ' Explain a method of measuring errors in the pitch of a screw re' 1-' trtfr"a (6)

'i ' tii) , Describe a method used to check the flatness of a surface plate'(lO)

55466

2

14. (al (r) Drplain with the help of a neat sketqh the prineiple and working

of laser interferometer. State its applications in machine tool

metrologl. (12)

Diseussthe applications of computer aided inspection. (4)

(ii)

or

,,,'

"',""""""',',,

,,,,,,,

,,

(bl (d

Sketch a bridge type CMM. E rylain the procedu# to b6::,qsed:in

measurement of various dimensions of a typical component

using

(ii) Explain how the performance of CMM is:eveluatcd.

,,,,

it.

(L2l

(4)

'...,,:

,::1,' ",::,,,,, ' ',r..

'

, t,:'

15. (a) (il Brplain the construction and woiltiag',,,.ef a hydraulic force meter. (8)

(ii) Discuss the advantages and disadvantages of the following :

(U Pitot tube and

(21 Rotameter. .,,i:i::;,:.i,:,,. ' (81

,,;;li:""

.'"i:,,,::-'::.::,i:,..

tbr,ii,,i'

.,.!:i:i:.:'rr::r:::.. .;.

{b} (il Explain with a neat sketoh tfre-:bonstruction and working of a

(ii) Draw a simplp sketph ,of a non-contact type measunng

Mcleod Gauge. :

(10)

temperature

instnlment _qn4 describ-e each element.

(61

3 5tr66