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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 11
1.
Reason for operating an evaporator in multiple effect is to secure
increased steam economy.
decreased steam consumption.
both (a) and (b).
increased capacity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
In a cooling tower, water becomes cool by
loosing sensible heat.
heat transfer to surroundings.
vaporisation due to heat loss to air.
loosing latent heat.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
In Fourier's law, the proportionality constant is called the
heat transfer co-efficient
thermal diffusivity
thermal conductivity
Stefan-Boltzman constant
Answer: Option
Explanation:
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4.
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.
greater than
lower than
is same as
half
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Pick out the wrong statement.
Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling.
Thermal conductivity of a dry material is more than that of the damp material.
Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator.
Vaporisation of organic substances in evaporator mostly causes foam formation.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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