The figure shows a horizontal pipeline with a sudden enlargement. The energy gra

Question

The figure shows a horizontal pipeline with a sudden enlargement. The energy grade line and the hydraulic grade line under a certain flow of an incompressible fluid of specific weight 10 kN/m^3 are also shown. The pressure change due to the enlargement is most nearly an increase of 3 kPa a decrease of 3 kPa an increase of 30 kPa a decrease of 30 kPa The figure shows a horizontal pipeline with a sudden enlargement. The energy grade line and the hydraulic grade line under a certain flow of an incompressible fluid of specific weight 10 kN/m^3 are also shown. The pressure change due to the enlargement is most nearly a decrease of 27 kPa an increase of 27 kPa a decrease of 30 kPa an increase of 30 kPa The figure shows a 10-cm diameter, horizontal pipeline with two piezometers installed 3 m apart. Under laminar flow of lubricating oil (specific gravity = 0.92 and viscosity = 3.8x10^1 Pa-s), the difference in piezometer readings is 12 cm. The flow rate (m^3/min) under the above conditions is most nearly 0.02 0.09 0.14 0.21 A partition remains constant water levels on the two sides of the tank shown. The discharge (m^3/day) through a 2-cm diameter orifice (coefficient of contraction 0.83) located as shown is most nearly 70 100 150 180

Explanation / Answer

16. an increment of diameter means a decrease of velocity, and according to Bernoulli’s equation that would mean an increase in Pressure. Now, as we got a variation of 3 m in head, we multiply 3*10 and we get 30 kPa.

The answer is C.

17.Similar situation but with a loss of energy, now the increment of head is only 2.7 m and that gives us 27 kPa.

The answer is B.

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