The distance between the centre of a rivet hole to the nearest edge of the plate is called
A. Pitch
B. Margin
C. Back pitch
D. None of these
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The LMTD correction factor (FT ) is defined as the
A. Ratio of true temperature difference to the LMTD
B. Ratio of LMTD to the true temperature difference
C. Differenced of true temperature difference and the LMTD
D. Geometric mean of the true temperature difference and the LMTD
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Bracket supports are the most suitable for supporting __________ vessels.
A. Thick walled vertical
B. Horizontal
C. Thin shperical (e.g. Horton sphere)
D. None of these
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Saddle supports are used for supporting __________ vessels.
A. Horizontal cylinderical
B. Tall vertical
C. Thick walled vertical
D. Thick spherical
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Skirt support is the most suitable for supporting __________ vessels.
A. Small horizontal
B. Large horizontal
C. Tall vertical
D. Thick walled
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Lug support is meant for supporting __________ vessels.
A. Large horizontal cylindrical
B. Tall but empty
C. Small
D. Thick walled tall
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Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )
A. 0.2 D
B. 0.5 D
C. 0.66 D
D. 0.80 D
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Pick out the wrong statement about distillation operation
A. Distillation under vacuum is a substitute for steam distillation
B. In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation
C. In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other
D. Flash distillation, differential distillation & steam distillation are all continuous distillation processes
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What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?
A. 6.5 cms
B. 6.5 mm
C. Equal to tube I.D
D. Equal to tube O.D
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In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
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In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as
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The raio, (properller agitator dia/tank dia) is normally taken as
A. 0.15-030
B. 0.5-0.65
C. 0.75-0.85
D. 0.60-0.90
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Length to diameter ratio of most rotary driers is in the range of
A. 1 to 2
B. 4 to 10
C. 10 to 20
D. 20 to 30
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In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.
.
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Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.
A. Less than
B. More than
C. Same as
D. Either more or less (depending upon relative volatility)
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For high pressure process equipments/vessels, the connected nozzle should be
A. Welded
B. Screwed
C. Flanged
D. Brazed
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For turbine agitator, the impeller diameter is about
A. 0.3 to 0.5 d
B. 0.1 to 0.2 d
C. 0.65 to 0.85 d
D. 0.95 d
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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
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Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
A. Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column
B. Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hence insulation required is less
C. Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm2
D. Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2
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In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
A. nth
B. ( n 1 ) th
C. 0.5 nth
D. 1.5 nth
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