The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

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. T1 – T2
B. T1 – Ta
C. T2 – Ta
D. None of these

A. Surrounding temperature
B. Average temperature of the fin
C. Temperature of the fin end
D. Constant temperature equal to that of the base

A. CP. μ/k
B. hD/k
C. h. CP/μ
D. CP. μ/h

A. High viscosity liquid is to be cooled
B. Requirement of heat transfer area is low
C. Overall heat transfer co-efficient is very high
D. A corrosive liquid is to be heated

A. Molten sodium (a coolant used in fast breeder reactor)
B. Water
C. Transformer oil
D. Dilute H2SO4