In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
B Maintaining vacuum on tube side is more difficult than that on the shell side
C Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
D Condenser can act as a storage unit for condensed steam

Correct Answer: Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

Bissoy MCQ
#Chemical Engineering #Chemical Engineering Basics

Related Questions

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
A Decreases the pressure drop
B Decreases the outlet temperature of cooling medium
C Increases the overall heat transfer coefficient
D None of these
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
A Once
B Twice
C Thrice
D Four times
In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)
A $$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$
B $$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
C $$\frac{{4{{\text{p}}^2}}}{{\pi {\text{d}}}}$$
D $$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is
A Infinity
B Zero
C Same as average heat transfer co-efficient for tube side
D None of these
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.
A 3-5
B 5-11
C 8-15
D 12-18
Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the
A Less corrosion problems
B Flexibility possible in the baffle arrangement
C Low pressure drop
D High heat transfer co-efficient
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a
A U-bend
B Floating head tube sheet
C Either A or B
D Neither A nor B
Ratio of tube length to shell diameter for a shell and tube heat exchanger is
A 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
B 4 : 1 to 8 : 1 for liquid-liquid exchanger
C Both B & C
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
A 2 to 3
B 3 to 5
C 4 to 8
D 6 to 12

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