Q.1
Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.
Q.2
LMTD correction factor is used in heat exchanger design for
Q.3
Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
Q.4
Pick out the wrong statement
Q.5
In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
Q.6
Value of Peclet number = 0, is the representative of
Q.7
The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.
Q.8
Bubble cap plate column is
Q.9
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
Q.10
The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.
Q.11
Normal screwed fittings are used for pipes upto a diameter of __________ inches.
Q.12
Reflux ratio variation in a distillation column is between
Q.13
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.
Q.14
What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
Q.15
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure
Q.16
If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.
Q.17
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
Q.18
Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
Q.19
The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.
Q.20
Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?
Q.21
In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
Q.22
Rivets are generally specified by the
Q.23
The thermal stress in a metallic bar does not depend upon the
Q.24
Maximum allowable vapour velocity in a bubble cap tower is determined by the
Q.25
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
Q.26
In a bag filter, the pressure drop increases directly as the
Q.27
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be
Q.28
Lap joints are preferred for plates having thickness __________ mm.
Q.29
The force due to wind load acting on a tall vessel depends upon its
Q.30
Maximum acceptable total liquid gradient over a tray is about __________ mm.
Q.31
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?
Q.32
Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m².°C.
Q.33
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the
Q.34
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the
Q.35
When one of the fluids is highly corrosive and has fouling tendency, it should
Q.36
Floating head heat exchangers are used for the
Q.37
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
Q.38
Diameter of the seive tray column is determined by the
Q.39
Baffles may be eliminated for
Q.40
__________ is the determining factor for the number of bubble caps to be used per tray.
Q.41
Scale up problem in design based on the similarity concept takes into account __________ similarity.
Q.42
The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.
Q.43
The buckling tendency of compression members is always in the direction of the
Q.44
Le/D for a Tee (used as elbow, entering branch) would be
Q.45
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)
Q.46
In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)
Q.47
The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.
Q.48
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)
Q.49
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.
Q.50
The equivalent diameter for pressure drop is __________ that for heat transfer.
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