Question

Answer any THREE (3) questions, 20 marks each A.1 (a) The tank contains four successive layers of namely oil (S.G.=0.893), water, Fluid X and mercury (S.G. = 13.6) of different thickness as shown in Fig. A.l(a). Given that the gauge pressure at the tank bottom is 139 kPa, (i) What is the Specific Gravity (S.G.) of the Fluid X? (5 marks) (ii) What is level of Fluid X (h) in the open tube tapped at 1.5 m below the bottom of the water layer? (5 marks) E Water E 3 m Fluid X 0.5 m 1 Mercury Fig. A.1(a) (b) A thin rectangular plate P (500 mm x 500 mm in dimensions) is separated from the upper and lower fixed solid surfaces by two layers of viscous liquids of thickness h, and ho are 0.2 mm and 0.13 mm respectively as shown in Fig. A.1(b). The corresponding dynamic viscosity 0.07 Ns/m² (un) and 0.15 Ns/m(Hb). The plate is moving at a constant velocity of 0.6 m/s. Calculate the pulling force F required for the plate movement. (10 marks) Plate ha=0.2 mm Liquid A la hb= 0.13 mm 1 Liquid B lue Fig. A.1(b)

Answer 1

91 - о: 342 - 5 3 | | я = 2 - : 13 • 4 > Pa = 139 klas Ern 2) 139 : О893 x 9• 31 x1 + 9-31 х2 + Схсу: 8 ) х2 + 126x9"Ән хоо 2 ч. / iiy equating Pressure at flere СА, 1ч92 x x, :чо 2 x Yо ху. У * Ү5х2 + о. 893 x Yuk/ -| 3-434)

ع سے مے سے - A ح + * م ا د en amb du اة SX وه ک 012803 /N {ه . 2 ) - او و دوم رمان نہ 20 ج A=0.5X0.5 m² وA وہ 298 + .8 3 2035 و6 -F بر 577 . ۱۴ : 25