Which of the following terminology is used for the temperature at which new grains are formed in a metal?

Producer gas consists mainly of________?

Coke made in narrower by-product coke ovens (as compared to wider ovens) is ________?

Tolerable limit of nitrogen oxides in air is ________ ppm?

Steady state equimolal counter diffusion occurs in case of ________?

In reverberatory furnace, charge is heated mainly by________?