A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of________?

Gaseous diffusivity at atmospheric pressure is of the order of ________ cm2/second?

The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the________?

Pick out the wrong statement?

Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil________?

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ________ BTU?