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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 5
6.
Pick out the wrong statement.
Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient.
In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles.
S.I. unit of fouling factor is Watt/m2.°K.
Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
When warm and cold liquids are mixed, the heat transfer is mainly by
conduction
convection
radiation
both(a) & (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?
Cube
Plate
Sphere
All will cool at the same rate
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Vent pipes are provided in a condenser to
remove non-condensable gases.
purge the condenser.
facilitate easy cleaning of tubes.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Heat transfer by natural convection is enhanced in system with
high viscosity.
high co-efficient of thermal expansion.
low temperature gradients.
low density change with temperature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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