# Transcribed Image Text: ANSWER FOUR QUESTIONS ONLY

Transcribed Image Text: ANSWER FOUR QUESTIONS ONLY. THE QUESTIONS WITH EQUAL MARKES AND WITH ONE CHART.

Q.1. Water enters the mixing device shown in figure below, at (150 liter/sec) through pipe (A), while oil with

specific gravity (0.8) is forced in at (30 liter/sec) through pipe (B). If the liquids are incompressible and form a

homogeneous mixture of oil globules in water, find the average velocity and density of the mixture leaving through

the (30 cm) diameter pipe (c).

CMixture

Q.2.Water at (20°c) flows upward at (4 m/sec) in a (6 cm) diameter pipe. The pipe length between points (1), (2)

is (5m), and point (2) is (3m) higher. A mercury Manometer, connected between (1) and (2), has a reading

(h=135 mm), with (P1) higher, a- what is the pressure change (p1-p2)?, b- what is the head loss?

= 3m

h- 135 mm

Water

Mury

Q.3. A pump delivers (1500 liter/min) of water against a pressure rise of (270 kPa). Kinetic and potential energy

changes are negligible. If the driving motor supplies (9kW), what is the pump efficiency.

B. Evaluate the pressure drop for the incompressible fluid of the laminar flow through the straight pipe.

Q.4.Kerosene fluid (S.G.=0.88) enters the cylindrical arrangement of the figure below at section (1), at (0.08

N/sec).The (80 mm) diameter plates are (2mm) apart. Assuming steady flow, compute the inlet average velocity

(u1), outlet average velocity (u2) assuming radial flow, and outlet volume flux.

D:BOrmm

h=3mm

D,4 mm

B-Evaluate the head loss for the pipes in series and in parallel, showing the relation with the hydraulic grade line

for each one.

Q.5.A. Oil, with mass density of (900 kg/m3) and kinematic viscosity of (0.00001 m²/sec), flows at (0.2

m /sec) through (500m) long and (200 mm) diameter, cast-Iron pipe with roughness of (0.26mm).

Determine : a- the head loss, b- the pressure drop if the pipe slopes down at (10°) in the flow direction.

GOOD LUCK

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