6.8 F* $ hg-&fa&S U F€ EVH ffiSiTYFACL}LTY #F EruG E NdHffi ffiE$\IG3''d. Year Besigw & Prodwctiora Erugiweerirug Ele.p*r*re*rut

".tan.20f 2

'stg{s.#g p:#a qb*}*W@rug d"tb"Yl e*"*-{ #G p*,xai;;Jl d!&.^di dp"A.n*

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u4

U*f& *;az--;,Qryes_tias .Gl { 34 F?a rks}

rr- Design anangt* vemicr of r:nodulr-rs equais i ro;:ead 5 minuti:s of an al.c on

a circular scale of 171.888 rnnr in riiameter. If li:c rnarn scale vaiue eciuais 1

degree.

i- Calculate the number of divisions of r,.ernier scale.

2- Calculate lhe scaie Civision of vemier scale"

3- Calculate the lengih of the vemier scale.

'1- Using s neut skttch show a readiirg eq,.rals 5-{" 55/ on ihe designed

vernier.

b- Draw a nest ske$ch showing a mierometer reading - 0.7895 inch using a

m i crometer with the tir I lor,ving pararneters ;

S.V.*:0.025 in., Li.i,'.,L.:0.001 in., S.Y.,,.. =- 0.00C1 in.

c- Discuss using seest sketehes, horry to use ihc dial indicator to check

paral ie I isrn anrJ to .rrt il esure defi e,;tion.

'i**+*'x+*+**+**A**:3*+'i***+:i,:i**+t+tr*:t+*+>:)f *il*+$;i+,i.****+**,k*+\t:**.i::ir.**+::+,i:r:ir.:x:;rlk*;t **J,;i::r;*ri'i,**********

s- lliscuss the Abbe's prini:iple. Apply it on a. r'emiei caUper to deduce a fornnula

to ca.lculate; the estimateci eiror in measurenlent.

&- Iliscuss using neat sketches haw the Sine trar can be used to measure intemai

and cxternal.tapers.

. r: L,Isnrg the approximate stror method, deduce a f,;rmuJa to estimate the en'or in

the rneasured angle r;sing the sine bar technique. Lise a rceat sketclt to shorv the

parain,Sters used. -ffhy th'; Sine har shoulti nct be used for angles greater than,t <oo-rJ !

******+***+*****:t**+*+>N*l!:F#**+*)i':t*t,:f *:j.****)i*F***+*+*++*+:t*rr*+,t++x+*+rrj*;::**r!* ji$++*+:l::t****+*+*++r.:i<

E{estrqnjel(Z4 &4a rks}

E$g$iners: Prof. Dr. Monir Koura, Dr. M. Adel Rizk, Dr. M" A. Alvad and Dr. 'Iarner Hassan

c

A i I,i 5 HAll S i.i i..i ] VEE i i "ty.

F AC,"i L i'l,f F L_ iri G i l.; I h- R I i I G

?E S I il t'J &. PRO ilt.r CTI L:l.l EN G tI"" EER I l'{i} ir E Ir, r R.'f }r{ [ jri]'.ian. 2412

nlALg n

:1 .- Iir ihe sensitive level er:pcrimeni:

1- Shov the relatit)n tretweeri the le.,.ei scal* value (C). se ale <livision (d)and irial (tui:e) riidiris (p").

2- You rnust take forivai'<i anel bacl<warci readings ',-vhen using seilsitiveleveis. Why?

3- How can ;;3g conveil the scale value of the tnicrr-'rrnerer clinometer (0.0imm/rn) to measure the slope af a given sr-irface'/ Take ihe distancebetr,veen the tr,,,'o bloek gauges equals (L) irim.

The taper angle oL a taiiere,J hole shornn in the ligure is nieasurecl using lwoballs of different dianrel.ers and a depth microrceter.

!).

.1- Deduce a forrrruia 1br caiculating

the taper angle"

2- If the diameter of the small ball-lin.Oo+0.03

rnm and the diameter

of thq seeond ball .=- 15.38*0.05, ll

rnm.{ifi-anrl$j& were measured and

found : 12.I2-r0.0i rnm and

4.05t-t.l.01 mm respe r:tfu ely. [Isingthe general relalicn of error

combination find the value of sin tr

, : ,1i,:+ +*+,k?l,S-it:-::iiffi.:..1-"j: l'**** u,u**** **,F* r>]<*,i* *j*+* +* r *:, * *:9 * *:F+ii,i.:,.+ r;j r* x nr i?+ jF + * * * *:i.*

;.: I ;t*"-,.i*j1_(4) ( 24 Ma rks)rr" l,xplain the working principle of ihe differeniiai i:igh pressure pneumatic

measuring systern.

ir- A difTerential pneumatic rneasuring system. is clesigned to check the innerdituneter of a cylinder v,'hich has a tolerance of 0.05 rnm. Ihe inr:asuring heacl

was of pltrg shape with 3.jet orifice at 120 deg. and- o1'<iiarnetei'0.2 mm each.'fhe operating pressure u/as 200 kPu, and the, usecl rnclicating gallge has a

M.

Ball ofrarJius rr

:

\,at*t

Saii oiradi,;-r 1..'

l-::1ry!ryfs;Prof. Dr. Monir Koura, I)r. Adel Rizk, Dr. &I. A. Awacl and Dr. Tarner Hassan

AIN SHAl,,:iS Uili1,rERilTY, FACULIY SF- EhiclN=flililicDESiGN & PR-SIiUCTiCN El"lfiD'Jr:.Efi.ihi(l tiEFAl"l'f i!4Et lT

Jan.2A12

-flie Exarn Censists of Five Qr"ieslicns in Four pages. Jl+

scnsitivity of 100 F.lmrx. lJct*rmin* the pn.:umatic sensj'{.ivity, anil the ovet'ail

nra-qrificetion of the srstem.

c* Explaitt the u,orking pr:incipie oi the rneehanieal __ *ptical cornoarator and

.express its mechanicai, optical and overali filagtiii:lsaiion.

ef- F.xplain the working principle of ofte rilf,ti:oiogical device that serrse ihe

variation of, linear displacement and convert it tr: eleetrical signal.

EryryrnrryProf. Dr. Monir Koura, Dr. M. Adel Rizk, Dr" &I. A. Arvad and flr. Tamer Hassan