A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the ________ number?

Yield of charcoal in high temperature carbonisation of wood is about ________ percent?

Very tall packed towers are divided into series of beds to________?

Which of the following is a vacuum filter?

Pick out the correct relationship. (Where, Ri = internal reflux ratio Ro = external reflux ratio.)?

Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is________?