Related Questions

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If $${\sigma _{\text{t}}}$$ is the tensile stress for the shell material, then thickness of shell is equal to
A $$\frac{{{\text{pd}}}}{{{\sigma _{\text{t}}}}}$$
B $$\frac{{{\text{pd}}}}{{2{\sigma _{\text{t}}}}}$$
C $$\frac{{{\text{pd}}}}{{3{\sigma _{\text{t}}}}}$$
D $$\frac{{{\text{pd}}}}{{4{\sigma _{\text{t}}}}}$$
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 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
Which of the following is the maximum number of electrons that can be present in M-shell?
A 2
B 8
C 18
D 32
In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)
A $$\frac{{\text{D}}}{5}$$ and D
B $$\frac{{\text{D}}}{2}$$ and 2D
C $$\frac{{\text{D}}}{4}$$ and 2D
D D and 2D
In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is
A Zero
B p (tensile)
C -p (compressive)
D 2p (tensile)
The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.
A Equal to
B Less than
C Greater than
D None of these
The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
A Disk and ring
B Segmental
C Orifice
D Independent of the type of
How may valence electrons does a silicon atom have?
A 0
B 1
C 2
D 4
E None of the above
Except Helium, all noble gases have how many electrons in the outermost shell?
A 4
B 8
C 6
D 10

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