Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the________?

Which is not a natural insulating material?

A metal having a Poisson’s ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is________?

Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid________?

Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the ________ number?

Large diameter reinforced cement concrete (RCC) pipes are generally joined by ________ joint?