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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 2
21.
What is the unit of thermal conductivity ?
Kcal/hr. m2 °C
Kcal/hr.m.°C
Kcal/hr.m
Kcal/hr. °C
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for
black painted bodies only
all bodies
polished bodies only
a black body
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
It is not preferable to use superheated steam in evaporators, because of its very
high temperature
high pressure
low film co-efficient
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is
3.06 x l05
6.12 x 105
7.24 x 105
9.08 x 105
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
LMTD for counterflow and prallel flow heat exchanger will be the same, when the
cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).
outlent temperature of both the hot and cold fluid are same.
outlet temperature of hot fluid is less than the outlet temperature of the cold fluid.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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