Q.1
Length to diameter ratio of most rotary driers is in the range of
Q.2
In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms. .
Q.3
Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to
Q.4
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
Q.5
Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.
Q.6
Which of the following is the best tube material from thermal conductivity point of view alone?
Q.7
In a heat exchanger, shell side fluid velocity can be changed by changing the tube
Q.8
Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.
Q.9
The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.
Q.10
Pressure drop per tray in the atmospheric distillation column is about __________ psi.
Q.11
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
Q.12
Bubble cap tray is the most commonly used tray in large distillation column, because
Q.13
The slope of the feed line in distillation opeartion is given by (where, q = fraction of the feed stream that is liquid.)
Q.14
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.
Q.15
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.
Q.16
The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally __________ the tube wall thickness.
Q.17
Optimum reflux ratio in a continuous distillation column is determined by the
Q.18
What is the slope of the operating line in the rectifying section of a distillation coloumn?
Q.19
What is the value of 'q' for saturated vapor feed to a distillation column ?
(where q = fraction of the feed stream that is liquid.)
Q.20
Nominal size of a pipe is an indication of its __________ diameter.
Q.21
Joint efficiency (J) for a seamless pipe is
Q.22
The function of manholes provided in the shell of a distillation column is to
Q.23
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
Q.24
Safety valves are provided in chemical equipments to guard against excessive
Q.25
The stress developed in a material without any permanent set is called the
Q.26
Pick out the wrong statement.
Q.27
Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is
Q.28
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).
Q.29
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
Q.30
A claming section before the liquid flows into the downcomer is privided to
Q.31
Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.
Q.32
In the design of a bag filter, the gas temperature is an important consideration, as it affects the
Q.33
In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.
Q.34
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation
Q.35
Fresh water carrying pipelines in chemical industries are coloured with __________ color.
Q.36
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)
Q.37
The main purpose of providing stepping on the trays is to
Q.38
For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used?
Q.39
Excessive liquid gradient on a tray may result in the
Q.40
The maximum liquid gradient over a tray must not exceed
Q.41
The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
Q.42
Pick out the wrong statement.
Q.43
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
Q.44
Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.
Q.45
Flanges are connected to pipes by
Q.46
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
Q.47
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.
Q.48
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of
Q.49
The ratio of linear stress to linear strain is termed as the
Q.50
Pick out the wrong statement pertaining to the design of a basket type evaporator.
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