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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 1
11.
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the
baffle spacing & shell diameter.
tube diameter & pitch.
viscosity, density & mass velocity of shell side fluid.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
In the equation Q = UAΔt; Δt is
geometric mean temperature difference.
arithmetic mean temperature difference.
logarithmic mean temperature difference.
the difference of average bulk temperatures of hot and cold fluids.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
With increase in porosity, the thermal conductivity of a solid substance
increases
decreases
remains unchanged
may increase or decrease; depends on the solid
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
For an ideal black body
absorptivity = 1
reflectivity = 1
emissivity = 0
transmissivity = 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is
40.5
34.4
26.8
25
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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