The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ?

Related Mcqs:

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?

A. Lower heat transfer area B. Lower steam economy C. Higher steam economy D. Higher solute concentration in the product...

It is not preferable to use superheated steam in evaporators, because of its very_________________?

A. High temperature B. High pressure C. Low film co-efficient D. None of these...

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

A. > 0.75 B. < 0.75 C. < 0.50 D. < 0.25...

For a multipass shell and tube heat exchanger, the LMTD correction factor is always________________?

A. 1 B. > 1 C. < 1 D. Between 1 & 2...

In a 1-1 concurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is_________________?

A. ∞ B. 0 C. Equal to the difference between hot and cold fluids inlet temperature D. Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature...