14.
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation

19.
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

20.
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.

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