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Theory of Pumping and Pressure Calculation

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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?

Depends on the height of the liquid (C) 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?

27228 Pa (B) Signup and view all the answers

What is friction head in a pump?

The pressure to overcome friction, measured in equivalent metres (C) Signup and view all the answers

Where is velocity head found in a pumping system?

On both the suction and discharge sides of the pump (C) Signup and view all the answers

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

Fluid densities, vapour pressures, velocities, pipe friction, pressure head, and static head or lift on the suction side of the pump (D) Signup and view all the answers

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

Dynamic suction head, dynamic discharge head, static suction head, static discharge head, and pressure head (A) Signup and view all the answers

What is shut-off head in a centrifugal pump?

The head developed by a centrifugal pump when running with its discharge valve shut (A) 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 = ρg (A) Signup and view all the answers

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

The pressure at the base of a column of fluid is not affected by the shape of the container. (A) Signup and view all the answers

What is static head in a pumping system?

The head measured with the pump off and no liquid flowing. (B) Signup and view all the answers

What is dynamic head in a pumping system related to?

Overcoming friction in pipes, valves, and fittings. (C) Signup and view all the answers

What does static suction lift measure in a pumping system?

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. (B) Signup and view all the answers