Question

Water distribution meters which measure the velocity of flow across a cross-section whose area is known and used only for high flows are called:
1. displacement meters
2. inferential meters
3. composite meters
4. positive meters

Answer 1

Correct Answer - Option 2 : inferential meters

Concept:

The flow meters are generally two types based on their functionality:

1. Inferential meters

2. Displacement or Positive Meters

1. Inferential meters: They measure the rate of flow i.e. discharge across a cross-section of a given area.  They do not measure absolute velocity or volume.

Examples are:

Venturi tubes, Rotameter, orifice plate, Flow Nozzles, mass flow meter, Swirl meters, etc.

2. Displacement or Positive Meters: They measure the total amount of flow i.e. Volume of flow.

Examples are:

 Reciprocating piston, Rotating piston, etc.