Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about ________ °C/km?

Suitability of steel for its use in cable is judged by its strength in________?

Sillimanite is a ________ refractory?

During sensible heating of humid air________?

What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?