Centrifugal pumps are not a positive displacement pump. They are a subclass dynamic work absorbing turbo machinery. They are used to transport fluids. It transports fluid by conversion of rotational kinetic energy to hydrodynamic kinetic energy.

Using a card diagram, we can asses indicator diagram. This process is performed using multiple parameters. One of m is maximum firing pressure and or is comparison pressure.

All units in NPSH are psi units. The psi units are kilopascal, bar, pounds per square inch etc. The ?a? in psia indicates that pressure is measured above absolute zero which is a perfect vacuum.

Wooden pipes for transportation and or important facilities is not feasible. Wood has various properties against water. Water flowing through wooden pipe will slowly reduce strength of wood which may lead to cracks.

A reciprocating pump consists of a piston pump, plunger and diaphragm pump. It is a class of positive displacement. Reciprocating pumps will last for years and decades.

Indicator diagrams are drawn by taking diagrams at regular intervals. This time taken at regular interval is matched with ship?s sea trial diagrams. The comparison is to check if re is any significant difference in performance.

Absolute pressure is defined as summation of Atmospheric pressure plus gauge pressure. This equation provides answer in units of pressure. The obtained psi can be converted to units of head.

Deficiencies in an indicator diagram are classified into many types. Deficiencies can be determined using card diagram. Card diagram contains maximum firing pressure and compression pressure. In deficiency 3, compression pressure is low and peak pressure is also low.

High loading in engines will lead to bearing damage. It also leads to several or problems like cracking, breaking etc. So, it is very important in assessing and reading se diagrams correctly.

During second half of NPSH, vapour pressure is more difficult to determine. It is a measure of desire of liquids. Cool water has a low vapour pressure. Thus, option is Vapour pressure.