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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 9
26.
Kirchoff's law is applicable to
monochromatic radiation only
total radiation only
both (a) and (b)
only volumes and not to surfaces
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
In a forward feed multiple effect evaporator, the pressure is
highest in last effect
lowest in last effect
same in all effects
dependent on the number of effects
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
increase
decrease
remain unchanged
either increase or decrease; depends on the coolant flow rate
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Which of the following situations can be approximated to a steady state heat transfer system ?
A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C.
10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C.
Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C.
A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.
180
970
3.97
data insufficient, can't be predicted
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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