1 In an orifice meter pressure loss caused by friction is le

___1. In an orifice meter, pressure loss caused by friction is less than in a venturi meter with the same diameter ratio

___2. In a rotameter, fluid velocity is proportional to the height at which the interior float is positioned

True or False

Solution

1. false . In an orifice meter large pressure drop because of presence of eddies on the downstreamside of orifice plate whereas the shape of venturi meter prevent formation of these eddies and greater reduction in pressure loss.

2. false .Because as the bob rises (height of interior float increases) the velocity decreases.

The rotameter isavery commonly used flow measuring device especially in low pressure system .it is used for both liquid and gas .this simple device is just a tapered tube with ametal bob(float).on acentral shaft.