Q. Air flows at the rate of 1.5 m3/s through a horizontal pipe with a gradually reducing cross- section as shown in the figure. The two cross-sections of the pipe have diameters of 400 mm and 200 mm. Take the air density as 1.2 kg/m3 and assume inviscid incompressible flow. The change in pressure ( p2 – p1 ) (in kPa) between sections 1 and 2 is
(A) -1.28 (B) 2.56 (C) -2.13 (D) 1.28
Ans: -1.28
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