7/29/2019 2007 -July-ME45

1/2

.,Pag,l ... ' l Ml,._ I I_Q l l l_j l_]

SCHEME IFourth Semes ter B.E. Degree E xamination , July 2007Mechanical E ngin eering

Fluid Mechanics'I imc _l h r ~ . l jMax. Marh: IOI

No te : / .Answer any FIVE full q 1. Any miHing tlma may be ttHtmwtl t t t h ~ r -

a. Ddlnc and diffcrentiatt.: b ~ t w c c n the loJI,,wing :1) \\ Clt:hl density and m a ~ s d c n ~ i t ) ii) 1-.incmatic vi\Cos ity dynamic v i ~ c o s iiii) ( o:npn:ssibilil\ and hulk rm>Julusiv) Sur(u(C tension and capillmily (12 '11 kl

b. fhe dynamk \iscosity of an oil used JiJr lubricatiln 1>.:1\n:cn a shaft and 'ICC\'C "b potsc T h ~ 1hamctcr of the shati is 0.4 m and rotates at 190 rpm. Caku latc thtpower lllst in the b.:aring tnr a slct.:vc length ol lJ() mm . rhe tllickncss or lhlind lhc pressure,,( fluid iuthe pipe if the t.lilkrcuce olmercurv level in l \ \ l ) l1mhs is'0 mas tiiH Mark I' a. Ocrivc ;m express ion for tnt:1 Ioree on u curved s u r f ~ c c . submerged in a static lluid

( I I ~ \lark,)h. .-\ tank contJ1ns water upto . Obtalll al l e'i.pr.:ssaon for cnntimnt) t:qu.Jlion li.1r a 3 dnncnsional ll C> \\ ' in ( M1cs1 lllCtlllnhnatcs . (Ill Mark ' Ic l'hc ,cJ,city "''lllpnncnts in a t"u Jimcnsionalll

7/29/2019 2007 -July-ME45

2/2

5 a State Bud,ingham 's n theorem. (02 \tarklb. Find the expression li.1r the pgwer developed by a pump (P ) when it depends UJ"lll thehead (I l l. discharge (Q) and specific weight('') of the fluid . (08 'hrlsumpttons li.1r \UCii a derivation. (tU \tor"s)b. hnd the diameter of a ptpe of length :2000 m \\hen the rate ,,f llow ofwater throu.,hpipe j , 2110 ltslscc ;md the head lost due to fnctinn is 4 m. Take the value ofC =50 inC h c ~ : y ' s lomwl: cto :\t.rl..'l

7 a. \Vhat " llagcn l'oiscuille s formula? D e r i n ~ an expression li.'r the same. (06 Mark)h. Ohtain ttn expression ti1r velc>city of the o;ound w:wc in u wmpressible fluid intembofchange in pressure Jnd change ofdensity. (08 M"'l

c. Deline Mac.:h number, Mach angle and Mach cone (OC, Mark)

8 a. Dtflercntiat..: hclwecni) Strl!omlinc body and blun bodyit) Friction drag and pres!>ure drag. 108 Marl..')b. A man wctghtnl! '>81 N descends to the ground fr