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

A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final product

A. Feed
B. Depth of liquid over heating surface
C. Pressure difference between steam chest and vapour space
D. All A., B. and C.

A. Momentum diffusivity to mass diffusivity
B. Momentum diffusivity to thermal diffusivity
C. Thermal diffusivity to mass diffusivity
D. Thermal diffusivity to momentum diffusivity

A. The heat transfer rate is low in view of the large temperature drop
B. It is difficult to maintain
C. It is not economic
D. None of these

A. When heat transfer area required is very high
B. When heat transfer area required is very low, i.e. (100-200 ft2).
C. Because it occupies less floor area
D. Because it is less costly

A. Economiser
B. Regenerator
C. Ceramic recuperator
D. None of these