For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is________?

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about ________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate?

Stainless steel contains________?

Thermit welding is categorised as the ________ welding?

The main constituent of rock phosphate is ________?

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ________ temperature of air?