Related Questions

The diameter of fire tubes in Cochran boiler is of the order of
A 2 cm
B 6 cm
C 8 cm
D 12 cm
The fire tubes in a Cochran boiler usually have _________ diameter.
A 6.25 mm
B 62.5 mm
C 72.5 mm
D 92.5 mm
Cochran boiler is a
A Horizontal fire tube boiler
B Horizontal water tube boiler
C Vertical water tube boiler
D Vertical fire tube boiler
The fire tubes in a Cochran boiler are
A Horizontal
B Vertical
C Inclined
D None of these
The numbers of fire tubes in a Cochran boiler are
A 75
B 115
C 165
D 225
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
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
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
A Equal to
B More than
C Less than
D Either B or C; depends on maximum permissible internal pressure

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