Two pipe lines at a different pressures, pA and pB, each carrying the same liquid of specific gravity of S1 are connected to a U tube with a liquid of specific gravity of S2 resulting in the level differences h1, h2 and h3 as shown in the figure. The difference in pressure head between points A and B in terms of head of water is

Two pipe lines at a different pressures, pA and pB, each carrying the

1.	Two pipe lines at a different pressures, pA and pB, each carrying the same liquid of specific gravity of S1 are connected to a U tube with a liquid of specific gravity of S2 resulting in the level differences h1, h2 and h3 as shown in the figure. The difference in pressure head between points A and B in terms of head of water is
A.	h1S2 + h2S1 + h3S1
B.	h1S1 + h2S2 – h3S1
C.	h1S1 – h2S2 – h3S1
D.	h1S1 + h2S2 + h3S1
Answer» E.