Discharge capacity of reciprocating pump is lower than that of reciprocating pump. Discharge capacity of fluids is defined as discharge in terms of volumetric flow rate. It helps to regulate flow through a cross sectional area.

The main function of pump is to transfer and convert mechanical energy of a motor into pressure energy and kinetic energy. It plays an important role in transfer of fluid across pipeline.

In earlier days, indicator diagram was assessed with help of mechanical indicator. But now, we use a digital pressure indicator. It has got a lot of advantages over mechanical one. It has a compact hand-held unit with a computer display system.

During first half of NPSH, suction of air takes place. For suction of an air, a strong suction pressure is required. Sometimes, elevation of gauge must also be added. But, most of times it is considered negligible.

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 4, compression pressure is high and peak pressure is also high leading to overload of an engine.

A reciprocating pump is a class of a positive displacement pump. It includes a piston pump, plunger and a diaphragm pump. It has a long life. Turbine blades are not an example of reciprocating pump.

Power house is not a type of indicator diagram. It is also called as power station. The main purpose of power house is to supply electrical power to any system for an efficient working of system.

NPSH is defined as margin of pressure over vapour pressure. It happens at pump suction nozzle. It is difference between suction pressure and vapour pressure. Thus, correct option is P_s-P_vap.

Vapour pressure depends on temperature only. With increase in temperature, vapour pressure increases. It increases until it reaches critical temperature. At critical temperature, vapour pressure tends to slowly vanish.

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 which does not depend on temperature rise of fluid.