Tài liệu học tập

HYD_201A_2020F_Bài tập 2

  • Đăng bởi: nguyenphuocbinh
  • Sinh viên
  • 18/10/2020

Câu hỏi trả lời ngắn

 1.  If the flow through a syphon can be maintained up to about -7.5 head of water, how high above the water surface would the crest of the syphon have to be before the syphon ceased to function?

 

2.  A combined Pitot–static tube has a coefficient of 0.98. The differential head reading is 0.874 m of water when it is positioned on the centreline of a pipe of constant diameter. (a) What is the velocity of flow at this point? (b) If the stagnation pressure head is 2.942 m of water, what is the pressure head of the flowing water?

 

3. (a) Explain the hydraulic difference between a small orifice and a large orifice. (b) With respect to a small orifice, define what is meant by the coefficient of velocity and the coefficient of contraction. Give typical values of each coefficient. (c) A small orifice with a diameter of 0.012 m discharges water under a head of 1.43 m. If CD is 0.59, what is the actual discharge?

 

4. The tank in question 31 is covered with an airtight lid and the air space above the water is pressurised so that the flow increases to 0.00093 m3/s. If the other details remain the same, what is the pressure of the air?

 

5.  The specific gravity of a liquid is 0.75. What height of that liquid is needed to provide a pressure difference of 200 kPa?

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