Most commonly used crude heater before the fractionation tower in a refinery is the ________ heater?

With increase in calorific value of fuels, their adiabatic flame temperatures________?

For an ideal solution, the value of activity co-efficient is________?

The passage between the nozzle and the ________ is called ‘sprue’ in case of injection moulding?

Velocity of a chemical reaction________?

Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?