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.Management Sciences
Category: Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can___________________?
A. Withstand higher pressure for a given metallic shell thickness
B. Be fabricated very easily
C. Be designed without wind load considerations
D. Be supported very easily
The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________?
A. pd/2t
B. pd/4t
C. pd/t
D. pd/3t
Back-trapping in a distillation column results due to_________________?
A. Low gas velocity
B. High gas velocity
C. Excessive liquid gradient over the tray
D. Low reflux ratio
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?
A. Higher
B. Lower
C. Same
D. Unpredictable
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ?
A. Results in higher shell side pressure drop
B. Can accomodate less number of tubes for a given shell diameter
C. Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell
side fluid
D. Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer
co-efficient
In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon______________________?
A. Baffle spacing
B. Clearance
C. Pitch
D. None of these
Pick out the wrong statement ?
A. Plate efficiency increases with increase in superficial vapour velocity till entrainment limit
B. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"
C. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value
D. None of these
In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?
A. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe
conditions it is 3 mm
C. For internal cover and tube sheet is provided on both the sides
D. All A., B. & C.
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