If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will ________ times?

Bernoulli’s equation is not applicable, when the flow is________?

Cermets are ________ materials?

Corrosion involves exchange of electrons in ________ corrosion?

Presence of ________ in a dry gaseous fuel does not contribute to its calorific value?

Gravity stamp mill is meant for the ________ crushing?