Theory of Pumping and Pressure Calculation
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Questions and Answers

What is the weight of one litre of pure water at 4°C?

  • 1 Pa
  • 4°C
  • 9.81 N (correct)
  • 1 kg

    • What is the unit of pressure defined as a force of one newton over an area of one square metre?

  • Metre
  • Newton
  • Kilogram
  • Pascal (correct)

    • If one litre of water is spread evenly over the base of a container with an area of one square metre, what pressure will it exert?

  • 9.81 Pa (correct)
  • 4 kg
  • 1 Pa
  • 1 N

    • How does the pressure exerted at the base of a column of liquid vary?

    <p>Depends on the height of the liquid</p> Signup and view all the answers

    If one litre of mercury is placed in a container with an area of 0.0049 m2, what pressure will it exert?

    <p>27228 Pa</p> Signup and view all the answers

    What is friction head in a pump?

    <p>The pressure to overcome friction, measured in equivalent metres</p> Signup and view all the answers

    Where is velocity head found in a pumping system?

    <p>On both the suction and discharge sides of the pump</p> Signup and view all the answers

    What is net positive suction head (NPSH) calculated by taking into account?

    <p>Fluid densities, vapour pressures, velocities, pipe friction, pressure head, and static head or lift on the suction side of the pump</p> Signup and view all the answers

    What does total dynamic head in a pumping system take into account?

    <p>Dynamic suction head, dynamic discharge head, static suction head, static discharge head, and pressure head</p> Signup and view all the answers

    What is shut-off head in a centrifugal pump?

    <p>The head developed by a centrifugal pump when running with its discharge valve shut</p> Signup and view all the answers

    What is the formula that summarizes the relationship between pressure, density, acceleration due to gravity, and height of liquid?

    <p>P = ρg</p> Signup and view all the answers

    What is Pascal's Paradox related to in the context of fluid pressure?

    <p>The pressure at the base of a column of fluid is not affected by the shape of the container.</p> Signup and view all the answers

    What is static head in a pumping system?

    <p>The head measured with the pump off and no liquid flowing.</p> Signup and view all the answers

    What is dynamic head in a pumping system related to?

    <p>Overcoming friction in pipes, valves, and fittings.</p> Signup and view all the answers

    What does static suction lift measure in a pumping system?

    <p>The distance below the centerline of the pump between the surface of the liquid level of a supply tank and the centre line of the pump.</p> Signup and view all the answers

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