Chemical Engineering - Heat Transfer

31.
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is
1.66
88.66
3.66
dependent on NRe only
Answer: Option
Explanation:
No answer description is available. Let's discuss.

32.
Sensible heat of hot industrial flue gases can not be recovered by a/an
economiser
regenerator
ceramic recuperator
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

33.
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)
K/h0
2K/h0
h0/K
h0/2K
Answer: Option
Explanation:
No answer description is available. Let's discuss.

34.
Radiator of an automobile engine is a __________ type of heat exchanger.
co-current
cross-current
counter-current
direct contact
Answer: Option
Explanation:
No answer description is available. Let's discuss.

35.
In pipe flow, heat is transferred from hot wall to the liquid by
conduction only.
forced convection only.
forced convection and conduction.
free and forced convection.
Answer: Option
Explanation:
No answer description is available. Let's discuss.