‘Fat’ coal means a coal having ________?

The average velocity in the tubes of a 1-4 heat exchanger is ________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate?

Film boiling is usually not desired in commercial equipments, because________?

N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60)?

An abrupt and sudden fall in the reading of barometer is an indication of the________?

A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is________?