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.Management Sciences
Category: Process Equipment and Plant Design
In case of 1.5″ heat exchanger tubes, the inside flow area _____________ with decrease in BWG?
A. Increases
B. Decreases
C. Remains same
D. None of these
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?
A. d = 1.1 t
B. d = 1.6 √t
C. d = 1.5 t
D. d = 3 √t
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?
A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap
C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around______________________?
A. 5 and 10
B. 45 and 75
C. 180 and 300
D. 300 and 500
Maximum acceptable total liquid gradient over a tray is about _______________ mm?
A. 5.5
B. 12.5
C. 30.5
D. 45.5
The normal range of velocity of steam in pipes is _________________________ m/sec?
A. 0.1-0.5
B. 1-5
C. 10-20
D. 80-100
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________?
A. Downcomer liquid seal
B. Static submergence
C. Skirt clearance
D. None of these
Lap joints are preferred for plates having thickness _______________ mm?
A. < 12.5
B. > 3
C. > 5
D. 5-10
Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?
A. Flow rates of each fluid
B. Type and size of packing
C. Concentration of each fluid
D. All A, B. & C.
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