Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
A. Sorel-Lewis method
B. McCabe-Thiele's method
C. Ponchon-Savarit method
D. None of these
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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 seive and valve trays than the bubble cap
C. Maintenance cost for valve and seive 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 provides the maximum flexible operating range
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D L e for fully open globe value may be around
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In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.
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__________ shapedroof is the most commonly used roof for cylinderical storage tanks.
A. Conical
B. Flat
C. Dome
D. Umbrella
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Speed of industrial paddle agitator ranges from __________ rpm.
A. 1 to 5
B. 20 to 100
C. 500 to 750
D. 1000 to 2000
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Which of the following lengths of heat exchanger tubes are normally not used in practice?
A. 2.5 metres
B. 6 metres
C. 10 metres
D. 0.5 metre
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Cylindrical pressure vessels in horizontal condition is generally supported on a __________ support.
A. Lug
B. Skirt
C. Saddle
D. Guy wire
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__________ closure is the weakest enclosure for cylindrical vessels.
A. Hemispherical
B. Torispherical
C. Conical or flat plate
D. Elliptical
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The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 5 1 th the I.D. of the shell. Which of the following is not a function of the baffles?
A. To increase the residence time of shell side fluid
B. To provide support to the tube bundle
C. To reduce the induced vibration in the tubes
D. To increase the tube side heat transfer co-efficient by inducing turbulence
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Hold up of material in a operating rotary drier is in the range of
A. 0.05 to 0.15
B. 0.25 to 0.50
C. 0.5 to 0.8
D. 0.8 to 0.9
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Height of the flights in the rotary drier is in the range of
A. 0.08 to 0.12 d
B. 0.02 to 0.05 d
C. 0.2 to 0.5 d
D. 0.5 to 0.6 d
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The value of fouling factor depends upon the
A. Characteristic of process fluid
B. Velocity of process fluid containing suspended solids
C. Suspended solids in the fluid
D. All of the above
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The operating pressure drop range in a bag filter is about __________ mm water gauge.
A. 50-150
B. 5-10
C. 500-1500
D. 1500-2500
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In a thin cylindrical shell, the hoop stress is __________ stress.
A. Radial
B. Circumferential tensile
C. Compressive
D. Longitudinal
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Pick out the correct statement
A. Centre to centre distance between two consecutives rivets in a row is called the pitch
B. A rivetted joint made in overlapping plates is called butt joint
C. Hole size drilled in rivetted plates is less than the actual size of the rivet
D. None of these
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Pick out the wrong statement:
A. The tensile strength of a brittle material is less than its compressive strength
B. The compressive strength of a ductile materia] is less than its tensile strength
C. In a thick cylindrical shell, the hoop stress is maximum at the inner radius
D. The value of crushing load is more than that of buckling load for long colmns
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Vertical storage vessels are never supported by __________ support.
A. Bracket
B. Saddle
C. Skirt
D. Lug
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Which of the following material is seldom used for pressure vessel construction?
A. Rimmed still
B. Mild steel
C. Killed steel
D. Semi-killed steel
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Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?
A. Size, shape, orientation and surface of the packing particles
B. Density and viscosity of fluids
C. Fluid flow rates
D. All of the above
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