Q.1
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around
Q.2
In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
Q.3
The units of Young's modulus of elasticity and __________ are the same.
Q.4
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
Q.5
Tube height in a calendria type evaporator is normally less than __________ metres.
Q.6
Hole diameter of the seive trays in the distillation column ranges from __________ mm.
Q.7
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
Q.8
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
Q.9
Liquid gradient over a tray can be minimised by
Q.10
Needle valves are generally not used for
Q.11
Lug support is meant for supporting __________ vessels.
Q.12
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )
Q.13
Pick out the wrong statement about distillation operation
Q.14
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").
Q.15
Two iron pipes of the same nominal diameter but different schedule numbers will have the same
Q.16
The distance between the centre of a rivet hole to the nearest edge of the plate is called
Q.17
The LMTD correction factor (FT) is defined as the
Q.18
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?
Q.19
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.
Q.20
Le/D for fully open gate valves would be
Q.21
Pick out the wrong statement about the design of seive plate column and the bubble cap column.
Q.22
__________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
Q.23
Bracket supports are the most suitable for supporting __________ vessels.
Q.24
Saddle supports are used for supporting __________ vessels.
Q.25
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
Q.26
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
Q.27
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
Q.28
Skirt support is the most suitable for supporting __________ vessels.
Q.29
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
Q.30
Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.
Q.31
Pick out the wrong statement pertaining to a shell and tube heat exchanger.
Q.32
Pick out the wrong statement pertaining to shell and tube heat exchanger.
Q.33
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of
Q.34
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
Q.35
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
Q.36
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.)
Q.37
The most common standard size of bubble caps used in industrial operation is
Q.38
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
Q.39
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
Q.40
The ratio of shear stress to shear strain is called
Q.41
For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.
Q.42
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
Q.43
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
Q.44
For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
Q.45
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 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
Q.46
Filtration rate is affected by the
Q.47
In distillation columns, bubble caps are held in place over trays by
Q.48
Stage efficiency for packed tower varies with the
Q.49
It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than
Q.50
In case of design of a shell and tube heat exchanger,
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