This document contains 5 fluid mechanics questions and diagrams related to determining pressures using manometers, fluid columns, and specific gravities. Question 1 asks to determine the gauge pressure for a multi-fluid open container connected to a U-tube given specific gravities and fluid column heights. Question 2 asks to determine the differential height of a mercury column for a given air pressure in a tank. Question 3 asks to find the gauge pressure reading for a mercury manometer connected to a closed tank containing mercury. Question 4 asks to determine the gauge pressure for a tank containing compressed air and oil connected to a mercury U-tube manometer given various fluid column heights. Question 5 asks to determine the heights of oil and water in the right arm of

1. MET212- Fluid Mechanics & Machines
st
1 Semester, September 2011
CLASS WORK - 2 10
Name…… ……… ……… …… ………… I.D No.…….… ………
Date … … … Section …………
1. Determine the absolute pressure in Pa at a depth of 6 m below the
free surface of a tank of water when a barometer reads 760 mm
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mercury (ρ Hg =13600 kg/m ).
2. Determine the pressure in bar at a depth of 10 m in oil of SG 0.75.
3. What depth of oil in meter, specific gravity 0.75, will give a gauge
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pressure of 275000 N/m .
4. Express the pressure head (h) of 15m of water in meters of oil of SG
0.75.
Dr. Adel Afify MET 212
Octuber, 2011

2. Question 1
Multi-fluid open mouth container is connected to a U-tube, as shown in Figure. For
the given specific gravities (SG) and fluid column heights, determine the gage
pressure at A in kN/m2.
Question 2
The gage pressure of the air in the tank shown in Figure is measured to be 65 kPa.
Determine the differential height h of the mercury column. Water density is 1000
kg/m3.
Question 3
A closed tank fitted with a gauge and a manometer contains mercury as shown in
Figure. Find the gauge pressure reading in kPa if the mercury manometer shows a
reading of 200mm [g=9.81m/s2 and ρHg=13600 kg/m3].
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3. Question 4
A close tank contains compresseed air and oil (SGoil=0.90) as shown in Figure. A
U-tube manometer using mercury (SGHg=13.6) is connected to the tank as shown.
For column heights h1=92cm, h2=15cm and h3= 23cm, determine the gage
pressure in kN/m2.
QUESTION 5: Consider a U-tube manometer whose arms are open to the
atmosphere. One arm contains 70-cm high water and other arm contains light oil
(S.G 0.79) from the other. If the other arm contains oil-water and the height ratio of 6
(ho=6hw). Determine the heights in meter of each fluid in the right arm of this
manometer.
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